Elmo Rletschle L-BV7 User Manual

Edition: 04.2010 · 610.48060.40.000 Original operating instructions · English

Operating Instructions L-BV7



2BV7 060
2BV7 061
2BV7 070
2BV7 071

L-Serie

L-Series

Flüssig­keitsring

Liquid Ring

© 2010 Gardner Denver Deutschland GmbH · Industriestraße 26 · 97616 Bad Neustadt · Germany

Replication, distribution and / or editing of this document and the use and distribution of its content is
prohibited unless explicitly permitted. Violation obligates compensation for damages.
All rights reserved in case of the issue of a patent, utility patent or design patent.

Contents

Contents

1

Glossary ..............................................................................................................................................6

2 Safety ..................................................................................................................................................7

2.1 Definitions .................................................................................................................................7

2.1.1 Safety alert symbol.......................................................................................................7

2.1.2 Signal words.................................................................................................................7

2.1.3 Graphic symbols...........................................................................................................8

2.2 General safety precautions .......................................................................................................9

2.3 Residual risks..........................................................................................................................11

3 Intended Use .....................................................................................................................................12

4 Technical Data ..................................................................................................................................13

4.1 Mechanical data......................................................................................................................13

4.2 Electrical data..........................................................................................................................16

4.3 Operating conditions ...............................................................................................................16

5 Description of Vacuum Pump/Compressor .......................................................................................18

5.1 Design .....................................................................................................................................18

5.2 Operating method ...................................................................................................................18

5.3 Operating modes.....................................................................................................................19

5.3.1 Self-priming operation ................................................................................................19

5.3.2 Operation with operating-liquid feed ..........................................................................19

6 Transport and Handling.....................................................................................................................20

7 Installation .........................................................................................................................................22

7.1 Installation ...............................................................................................................................22

7.2 Electrical connection (motor) ..................................................................................................24

7.3 Connecting pipes/hoses (vacuum pump/compressor)............................................................25

7.3.1 Inlet connection ..........................................................................................................26

7.3.2 Discharge connection.................................................................................................26

7.3.3 Operating-liquid port...................................................................................................26

7.3.4 Notes ..........................................................................................................................27

7.4 Accessories.............................................................................................................................27

8 Commissioning..................................................................................................................................28

8.1 Preparation and start-up .........................................................................................................28

8.2 Self-priming operation.............................................................................................................30

8.3 Operation with operating-liquid feed .......................................................................................31

9 Operation...........................................................................................................................................33

9.1 Self-priming operation.............................................................................................................33

9.2 Operation with operating-liquid feed .......................................................................................33

10 Shut-Down and Longer Standstills....................................................................................................34

10.1 Draining...................................................................................................................................34

10.2 Preparing for longer standstill .................................................................................................34

10.3 Storage conditions ..................................................................................................................35

11 Servicing............................................................................................................................................36

11.1 Maintenance............................................................................................................................36

11.2 Repairs/troubleshooting ..........................................................................................................39

11.3 Spare parts..............................................................................................................................41

11.3.1 Ordering nash_elmo spare parts................................................................................41

11.3.2 Ordering standardized parts.......................................................................................41

11.4 Service/After-sales service......................................................................................................41

11.5 Decontamination and Declaration of Clearance .....................................................................42

12 Disposal.............................................................................................................................................43

© Gardner Denver Deutschland GmbH 3 / 64 610.48060.40.000

Contents

13

Accessories .......................................................................................................................................44

13.1 Flanges....................................................................................................................................44

13.2 Non-return valve......................................................................................................................44

13.3 Gas ejector..............................................................................................................................45

13.4 Liquid separator ......................................................................................................................46

13.5 Cavitation protection ...............................................................................................................49

14 Exploded View with Parts List ...........................................................................................................50

14.1 Parts list...................................................................................................................................50

14.2 Exploded view .........................................................................................................................51

EU declaration of conformity ..................................................................................................................54

Form for statement on safety .................................................................................................................55

Index.......................................................................................................................................................56

610.48060.40.000 4 / 64 © Gardner Denver Deutschland GmbH

List of Illustrations

List of Illustrations

Fig. 1:

Dimensions .............................................................................................................................13

Fig. 2: Minimum inlet pressure/cavitation limit ...................................................................................17

Fig. 3: Design and operation of liquid-ring vacuum pumps/compressors (cross-section of operating

chamber) .................................................................................................................................18

Fig. 4: Attachment points ...................................................................................................................21

Fig. 5: Points for measuring the vibration speed................................................................................23

Fig. 6: Securing elements for bolting feet to supporting surface........................................................23

Fig. 7: Pipe/hose connection of vacuum pump/compressor ..............................................................25

Fig. 8: Self-priming operation .............................................................................................................30

Fig. 9: Setting the operating-liquid flow rate: Setting pre-pressure....................................................31

Fig. 10: Setting the operating-liquid flow rate: Measuring the volume with a graduated vessel..........31

Fig. 11: Operation with operating-liquid feed: Non-automatic operation..............................................32

Fig. 12: Operation with operating-liquid feed: Automatic operation .....................................................32

Fig. 13: Maximum permissible quantity of water entrained via the inlet connection............................32

Fig. 14: Pour in preservative and turn shaft .........................................................................................34

Fig. 15: Removing vacuum pump/compressor housing.......................................................................38

Fig. 16: Pouring in decalcifying agent and freeing shaft by turning .....................................................38

Fig. 17: Flanges....................................................................................................................................44

Fig. 18: Non-return valve......................................................................................................................44

Fig. 19: Gas ejector ..............................................................................................................................45

Fig. 20: Mounting liquid separator, Part 1 of 2 .....................................................................................47

Fig. 21: Mounting liquid separator, Part 2 of 2 .....................................................................................48

Fig. 22: Exploded view: vacuum pump/compressor section ................................................................51

Fig. 23: Exploded view: motor section .................................................................................................52

Fig. 24: Exploded view: motor section .................................................................................................53

© Gardner Denver Deutschland GmbH 5 / 64 610.48060.40.000

Glossary

1 Glossary

In these instructions the following technical terms with the specified meaning are used:

Designation: Definition:

Vacuum pump

Compressor

Machine

Pump-motor unit

Machine set

Driving side;
D side

Non-driving side;
N side

Inlet pressure

Machine for generating a vacuum.

Machine for generating a gauge pressure.

Here: Vacuum pump or compressor.
Unit for extracting, transporting and compressing gases and/or vapors, as well as
for generating vacuum and gauge pressure. Here the drive is not considered part
of the machine.

Unit consisting of a machine and a drive motor.

Two or more machines that are interconnected with couplings and mounted on a
common base frame.

Side of the machine on which the drive is connected.

Side of the machine on which no drive is connected.

Pressure of the pumped gases/vapors on the inlet connection of the machine.

Discharge pressure;
Compression pressure

Pressure of the pumped gases/vapors at the discharge connection of the machine.

Test pressure

Pressure to which the machine is subjected when testing for leaks.

Qualified personnel Persons who, based on their training, experience and instruction, as well as their

knowledge of the pertinent standards, regulations, accident protection regulations
and operating conditions, are capable of carrying out certain tasks (e.g. start-up,
operation, maintenance, repair) and can recognize and avoid possible dangers in
the process. The required knowledge includes a knowledge of first aid and of the
on-site emergency equipment.
These persons must be authorized by the person responsible for system safety to
perform the required tasks.

610.48060.40.000 6 / 64 © Gardner Denver Deutschland GmbH

2 Safety

2.1 Definitions

To point out dangers and important
information, the following signal words and
symbols are used in these operating
instructions:

2.1.1 Safety alert symbol



The safety alert symbol is
located in the safety precautions
in the highlighted heading field
on the left next to the signal word
(DANGER, WARNING,
CAUTION).

Safety precautions with a safety
alert symbol indicate a danger of
injuries.

Be sure to follow these safety
precautions to protect against

injuries or death!

2.1.2 Signal words

DANGER

WARNING

CAUTION

NOTICE

NOTE

Safety precautions without a
safety alert symbol indicate a
danger of damage.

The signal words are located in
the safety precautions in the
highlighted heading field.

They follow a certain hierarchy
and indicate
(in conjunction with the safety
alert symbol, see Chapter 2.1.1)
the seriousness of the danger
and the type of warning.

See the following explanations:



DANGER

Safety



WARNING

Danger of injuries.

Indicates a potentially hazardous
situation,
that could result in death or
serious injury
if the corresponding measures
are not taken.



CAUTION

Danger of injuries.

Indicates a potentially hazardous
situation,
that may result in minor or
moderate injury
if the corresponding measures
are not taken.

CAUTION

Danger of damage.

Indicates a potentially hazardous
situation
that may result in property
damage
if the corresponding measures
are not taken.

NOTICE

Indicates a possible
disadvantage,
i.e. undesirable conditions or
consequences can occur
if the corresponding measures
are not taken.

NOTE

Danger of injuries.

Indicates an imminently
hazardous situation,
that will result in death or
serious injury
if the corresponding measures

Indicates a possible advantage
if the corresponding measures
are taken;
tip.

are not taken.

© Gardner Denver Deutschland GmbH 7 / 64 610.48060.40.000

Safety

2.1.3 Graphic symbols

The graphic symbol is located in safety
precautions in the left-hand field.

There are several types of graphic symbols:

Hazard alerting symbols

Prohibition symbols

... for general dangers:

... for special dangers:

Mandatory action symbols

... for general instructions:

... for special instructions:

... for general prohibitions:

... for special prohibitions:

Information

610.48060.40.000 8 / 64 © Gardner Denver Deutschland GmbH

2.2 General safety precautions



WARNING

Safety



WARNING

Improper use of the unit can
result in serious
or even fatal injuries!

These operating instructions
 must have been read

completely and understood
before beginning any work
with or at the pump-motor

When working on the unit,
there is a danger of injury,
e.g. in the form of cuts/cutting
off, crushing and burns!

During transport/handling as well
as assembly and disassembly
always wear personal protective
equipment (safety helmet,
protective gloves, safety boots)!

unit,

 must be strictly observed,
 must be available at the

operating location of the
pump-motor unit.



WARNING



WARNING

Hair and clothing can be pulled

Improper use of the unit can
result in serious
or even fatal injuries!

Only operate the pump-motor

into the unit or caught and
wound up
moving parts!

Do not wear long, loose hair or
wide, loose clothes!

unit
 for the purposes indicated

under "Intended Use"!

 with the fluids indicated under

Use a hair net!



DANGER

'Intended Use'!

 with the values indicated

under 'Technical Data'!



WARNING

Electrical danger!

Before beginning work on the
unit or system, the following
measures must be carried out:

 Deenergize.

Improper use of the unit can
result in serious
or even fatal injuries!

Transport and handling as well
as assembly and disassembly of
the unit may be carried out by
trained and responsible
personnel only!

 Secure against being

switched on again.

 Determine whether

deenergized.

 Ground and short-circuit.
 Cover or block off adjacent

energized parts.



DANGER

Electrical danger!

Work on electrical installations

© Gardner Denver Deutschland GmbH 9 / 64 610.48060.40.000

may be carried out by trained
and authorized electricians only!

Safety



DANGER

Electrical danger!

Do not open the motor terminal
box unless absence of electricity
has been ensured!



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

Before beginning work on the
unit or system:

 Interrupt supply of operating

liquid.

 Bleed lines and vacuum

pump/compressor
(depressurize).



WARNING

Danger from rotating external
fan of unit!

Only operate the unit with the fan
guard mounted!

It is prohibited to remove the fan
guard!



WARNING

Danger from rotating impeller



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

Only operate the unit with the
pipes/hoses connected to the
intake and discharge connection,
as well as to the operating-liquid
port!



WARNING

Danger from rotating impeller
of unit!

Only operate the unit with the
pipes/hoses connected to the
intake and discharge connection,
as well as to the operating-liquid
port!



WARNING

Danger in the form of cuts or
cutting off extremities on the
impeller of the pump-motor
unit!

Do not reach into the unit through
open connections!

Do not insert objects into the unit
through the openings!



WARNING

of unit!

Only operate the unit with the
vacuum pump/compressor
housing mounted!

Do not remove the vacuum
pump/compressor housing until
after the unit has been shut down
and the impeller has come to a
complete stop!

Consider that the impeller has a
certain run-out!

Danger due to gauge pressure
and vacuum!

Check the lines and containers
used for sufficient strength!



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

Check the connections of the
pipe/hose connections for leaks!

610.48060.40.000 10 / 64 © Gardner Denver Deutschland GmbH

Safety



WARNING

Danger of burns and scalding
from hot surfaces of the pump­motor unit and from hot fluids!

Do not touch during operation!
Allow to cool after shut-down!



CAUTION

2.3 Residual risks



Danger zone:

Shaft exposed in gap between
drive motor and vacuum

A

pump/compressor.

Hazard:

WARNING

Possible entanglement of long,

Danger of unit tipping over!

Secure the pump-motor unit on
the installation surface before
putting into operation!

loose hair!

Protective measures:

Wear hair net!



WARNING

Danger zone:

Fan guard

Hazard:

Long, loose hair can be drawn
into external fan through fan
guard grate, even with fan guard
mounted!

Protective measures:

Wear hair net!



WARNING

Danger zone:

Hot surface.

Hazard:

Burns/scalding possible.

Protective measures:

Do not touch!
Wear protective gloves!

© Gardner Denver Deutschland GmbH 11 / 64 610.48060.40.000

Intended Use

3 Intended Use

These operating instructions

 apply to liquid-ring vacuum

pumps/compressors of the L-BV7 series,
types 2BV7 060, 2BV7 061, 2BV7 070 and
2BV7 071,

 contains instructions bearing on transport

and handling, installation, commissioning,
operation, shut-down, storage, servicing
and disposal of the L-BV7,

 must be completely read and understood by

all operating and servicing personnel before
beginning to work with or on the L-BV7,

 must be strictly observed,
 must be available at the site of operation of

the L-BV7.

About the operating and servicing personnel of
the L-BV7:

 These persons must be trained and

authorized for the work to be carried out.

 Work on electrical installations may be

carried out by trained and authorized
electricians only.

 If necessary, the training/instruction on

using the L-BV7 can be carried out by the
manufacturer/suppler on order of the
owner.

The L-BV7

 are pump-motor units for generating

vacuum or gauge pressure.

 are used to extract, transport and compress

the following
pumped gases/vapors:

– all dry and humid gases,

which are not explosive or flammable,

– preferably air or air/vapor mixtures.
– In case of corrosive or toxic

gases/vapors contact service.

 are designed for operation with the

following
operating liquids:

– Water

with a pH of 6 to 9,
free of solid materials (such as sand).

– If the pH values or operating liquids

differ, it is necessary to contact service.

 are intended for industrial applications.
 are designed for continuous operation.

When operating the L-BV7, the limits listed in
Chapter 4, "Technical Data", Pg. 13 ff. must
always be complied with.

Foreseeable Misuse

It is prohibited

 to use the L-BV7 in applications other than

industrial applications
unless the necessary protection is provided
on the system,
e.g. guards suitable for children's fingers,

 to use the device in rooms in which

explosive gases can occur if the L-BV7 is
not expressly intended for this purpose;

 to extract, to deliver and to compress

explosive, flammable, corrosive or toxic
fluids
unless the L-BV7 is specifically designed
for this purpose,

 to operate the L-BV7 with values other than

those specified in Chapter 4, "Technical
Data", Pg. 13 ff.

Any unauthorized modifications of the L-BV7
are prohibited for safety reasons.
any maintenance and repair work, such as
replacing worn or defective components, may
only be carried out by companies authorized
by the manufacturer (please contact service).

610.48060.40.000 12 / 64 © Gardner Denver Deutschland GmbH

4 Technical Data

4.1 Mechanical data

Dimensions

N3.0
N2.0

2

P

4

3

H

H

2

H

6

H

Fig. 1: Dimensions

N1.0 Inlet connection
N2.0 Discharge connection
N3.0 Operating-liquid port
N4.2 Emptying or drain opening
N8.7 Connection for cavitation protection

W1

d

W3

B1
B

N1.0

Technical Data

A

G

W

S

5

3

P

1

H

S4

N8.7

S

2

N4.2

R

E

L

M

Specification in mm

Type 2BV7 060 2BV7 061 2BV7 070 2BV7 071

...-1
...-2

...-3 ...-1 ...-2 ...-3 ...-1

...-2
...-3

A 335 372 394 438 473 482 488 511

B 162 180 180 202 204 266 227 266

B1 125 140 140 160 160 216 190 216

E 100 100 100 140 140 140 140 140

G 186 218 218 231 266 266 252 266

H1 80 90 90 100 100 132 112 132

H2 107 117 117 134 134 166 146 166

H3 156 166 166 194 194 227 206 227

H4 180 190 190 222 222 260 234 260

H6 26 36 36 34 34 66 46 66

L 184 225 225 249 284 284 263 284

© Gardner Denver Deutschland GmbH 13 / 64 610.48060.40.000

Technical Data

Specification in mm

Type 2BV7 060 2BV7 061 2BV7 070 2BV7 071

...-1
...-2

...-3 ...-1 ...-2 ...-3 ...-1

...-2
...-3

M 72 68 68 89 89 99 96 99

P2 200 218 218 235 235 300 261 300

P3 161 180 180 201 202 265 225 265

R 59 55 55 71 71 81 78 81

S2 10 10 10 12 12 12 12 12

S4 M25 x 1.5 M32 x 1.5

S5 M16 x 1.5 M32 x 1.5

W 32 32 32 42 42 42 42 42

W1 110 110 110 120 120 120 120 120

W3 23 23 23 28 28 28 28 28

d G 1 G 1 G 1 G 1½ G 1½ G 1½ G 1½ G 1½
N3.0,

4.2, 8.7

G ¼

Specifications in inches

Type 2BV7 060 2BV7 061 2BV7 070 2BV7 071

...-1
...-2

...-3 ...-1 ...-2 ...-3 ...-1

...-2
...-3

A 13.2 14.6 15.5 17.2 18.6 19.0 19.2 20.1

B 6.38 7.09 7.09 7.95 8.03 10.5 8.94 10.5

B1 4.92 5.51 5.51 6.30 6.30 8.50 7.48 8.50

E 3.94 3.94 3.94 5.51 5.51 5.51 5.51 5.51

G 7.32 8.58 8.58 9.09 10.5 10.5 9.92 10.5

H1 3.15 3.54 3.54 3.94 3.94 5.20 4.41 5.20

H2 4.21 4.61 4.61 5.28 5.28 6.54 5.75 6.54

H3 6.14 6.54 6.54 7.64 7..4 8.94 8.11 8.94

H4 7.09 7.48 7.48 8.74 8.74 10.2 9.21 10.2

H6 1.02 1.42 1.42 1.34 1.34 2.60 1.81 2.60

L 7.24 8.86 8.86 9.80 11.2 11.2 10.4 11.2

M 2.83 2.68 2.68 3.50 3.50 3.90 3.78 3.90

610.48060.40.000 14 / 64 © Gardner Denver Deutschland GmbH

Technical Data

Specifications in inches

Type 2BV7 060 2BV7 061 2BV7 070 2BV7 071

...-1
...-2

...-3 ...-1 ...-2 ...-3 ...-1

...-2
...-3

P2 7.87 8.58 8.58 9.25 9.25 11.8 10.3 11.8

P3 6.34 7.09 7.09 7.91 7.95 10.4 8.86 10.4

R 2.32 2.17 2.17 2.80 2.80 3.19 3.07 3.19

S2 0.394 0.394 0.394 0.472 0.472 0.472 0.472 0.472

S4 M25 x 1.5 M32 x 1.5

S5 M16 x 1.5 M32 x 1.5

W 1.26 1.26 1.26 1.65 1.65 1.65 1.65 1.65

W1 4.33 4.33 4.33 4.72 4.72 4.72 4.72 4.72

W3 0.906 0.906 0.906 1.10 1.10 1.10 1.10 1.10

d G 1 G 1 G 1 G 1½ G 1½ G 1½ G 1½ G 1½
N3.0,

4.2, 8.7

G ¼

© Gardner Denver Deutschland GmbH 15 / 64 610.48060.40.000

Technical Data

Weight

4.3 Operating conditions

Type Weight
[kg] [lbs]

2BV7 060-1A.0. approx. 16 approx. 35.3
2BV7 060-2A.0. approx. 17 approx. 37.5
2BV7 060-3A.0. approx. 18 approx. 39.7
2BV7 061-1A.0. approx. 22 approx. 48.5
2BV7 070-1A.0. approx. 31 approx. 68.3
2BV7 070-2A.0. approx. 35 approx. 77.2
2BV7 070-3A.0. approx. 48 approx. 106
2BV7 071-1A.0. approx. 39 approx. 86
2BV7 071-2A.0. approx. 50 approx. 110
2BV7 071-3A.0. approx. 56 approx. 123

Minimum distances for heat dissipation

Temperatures

Temperature
of pumped
gases/vapors:

Operating­liquid
temperature:

temperature:

max. +80 °C [max. +176 °F]
At higher fluid temperatures,

measures must be taken on
the system to prevent burns,
e.g. mount separating safety
device (cover).

max. +80 °C [max. +176 °F]
min. +5 °C [min. +41 °F]
Nominal

value:
+15 °C

[+59 °F]
max. +40 °C [+104 °F] Ambient
min. +5 °C [+41 °F]

Type

2BV7 060 34 1.34
2BV7 061 34 1.34
2BV7 070 53 2.09
2BV7 071 53 2.09

Noise level

Measuring-surface sound pressure level as per
EN ISO 3744, measured at distance of 1 m
[3.28 ft] with medium throttling (100 mbar abs.
[1.45 psia]) and connected lines, tolerance  3
dB (A).

Type

2BV7 060 70
2BV7 061 70
2BV7 070 72
2BV7 071

Limit speeds for supply by converter

Type n [rpm]

2BV706 4,800
2BV707 4,000

4.2 Electrical data

See drive motor rating plate.

Minimum distance from

fan guard to adjacent surface

[mm] [inches]

1-m measuring-surface sound

pressure level L [dB (A)]

at 50 Hz: at 60 Hz:

70

76

Pressures

Min. inlet
pressure:

Dependent on the operating
liquid temperature
(see Fig. 2, Pg. 17)

When this temperature is
dropped below, the hose of
the liquid separator
(accessory) must be
connected to the connection
for cavitation protection
(Fig. 7, Pg. 25, Item 4).

Max.

1.1 bar abs. [16.0 psia]

discharge
pressure
during
vacuum-pump
operation:

8 bar abs. [116 psia] Max.

permissible
pressure in
pump-motor
unit:

If higher pressures can occur
in the system, then
corresponding protective
devices must be provided.

Max. discharge pressure p
compressor operation (at inlet pressure p

2 max

during

=

1

1 bar abs. [14.5 psia]):

p

Type

[bar abs.] [psia]

at

50 Hz:
2BV7 060 2 2 29.0 29.0
2BV7 061 2 2 29.0 29.0
2BV7 070 3 2.5 43.5 36.3
2BV7 071 3.5 2.5 50.8 36.3

at
60 Hz:

2 max

at
50 Hz:

at
60 Hz:

610.48060.40.000 16 / 64 © Gardner Denver Deutschland GmbH

Technical Data



300

250

200

150

[mbar abs.]

1

p

100

50

0

0 20406080

fl[°C]

4.5
4

3.5
3

2.5

[psia]

2

1

p

1.5
1

0.5
0

0 50 100 150 200

[°F]

fl

Fig. 2: Minimum inlet pressure/cavitation limit

fl [°C, °F] = Temperature of operating liquid

[mbar abs., psia] = Inlet pressure abs.

p

1

The minimum permissible inlet pressure of the pump-motor unit is dependent on the temperature of the operating
liquid.
During operation without cavitation protection, the minimum inlet pressure must be set above the shaded area.



Nominal operating-liquid flow rate

(with dry air extraction and with water at 15°C
[59 °F] as operating liquid)

Type

Flow rate

[m³/h] [ft³/h]

at
50 Hz:

at
60 Hz:

at
50 Hz:

at

60 Hz:
2BV7 060 0.20 0.20 7.06 7.06
2BV7 061 0.23 0.23 8.12 8.12
2BV7 070 0.28 0.34 9.89 12.0
2BV7 071 0.45 0.55 15.9 19.4

Operating-liquid filling amount for priming

Filling amount Type

[l] [gal (US)] [gal (UK)]

2BV7 060 0.40 0.106 0.088
2BV7 061 0.55 0.145 0.121
2BV7 070 0.80 0.211 0.176
2BV7 071 1.10 0.291 0.242

© Gardner Denver Deutschland GmbH 17 / 64 610.48060.40.000

Description of Vacuum Pump/Compressor

5 Description of Vacuum Pump/Compressor

2

1

3

4

5

Fig. 3: Design and operation of liquid-ring
vacuum pumps/compressors (cross-section of
operating chamber)

1 Discharge connection
2 Operating-liquid port
3 Inlet connection
4 Impeller
5 Housing
6 Discharge port
7 Inlet port
8 Operating liquid

6

8

7

5.1 Design

The L-BV7 2BV7s are liquid-ring vacuum
pumps compressors. They consist of the
vacuum pump/the compressor itself and an
electric motor. For the detailed design, see
Fig. 3, Pg. 18.

The pumped gases/vapors are sucked via the
inlet connection (3) into the pump-motor unit
and pushed out via the discharge connection
(1).

The impeller (4) with the blades is located in
the cylindrical housing (5). The impeller is
arranged eccentrically relative to the housing.
In addition, the housing also contains the
operating liquid (8). This liquid is fed in via the
operating-liquid port (2) and output together
with the pumped gases/vapors via the
discharge connection (1).

5.2 Operating method

When the impeller turns, the operating liquid is
put into motion and accelerated. This forms a
liquid ring that also rotates. Due to centrifugal
force, this ring is arranged concentrically to the
housing and eccentrically to the impeller.

During a complete rotation of the impeller, the
following occurs:
 The impeller cells are completely filled with

operating liquid at the upper vertex.

 During the first half rotation, the liquid ring

lifts off the impeller hub. The space in the
cells increases so that the pumped
gases/vapors are sucked in through the
inlet port (7).

 The space in the cells is largest at the lower

vertex, as these are virtually free of
operating liquid.

 During the second half rotation, the liquid

ring approaches the hub again. The space
in the cells decreases so that the pumped
gases/vapors are compressed and pushed
out through the discharge port (6).

610.48060.40.000 18 / 64 © Gardner Denver Deutschland GmbH

5.3 Operating modes

The pump-motor unit can function in several
different operating modes.
These differ in how the pump-motor unit is
supplied with operating liquid:

 Self-priming operation

 Operation with operating-liquid feed:

– Non-automatic operation
– Automatic operation

5.3.1 Self-priming operation

In this operating mode the pump-motor unit
automatically sucks in the operating liquid.
The operating-liquid flow rate is automatically
adjusted.

See Fig. 8, Pg. 30.

5.3.2 Operation with operating-liquid feed

In this operating mode the pump-motor unit
DOES NOT automatically suck in the operating
liquid.
A certain volume flow ("nominal operating­liquid flow rate") or pre-pressure must be set
for the operating liquid.

Description of Vacuum Pump/Compressor

Here the following additional distinctions are
made:

Non-automatic operation

In this case the operating liquid feed is
switched on and off manually with a stop valve.

See Fig. 11, Pg. 32.

Automatic operation

In this case the operating liquid feed is
switched on and off by a solenoid valve. The
solenoid valve is dependent on the motor
operating mode:

 Motor/pump-motor unit switched on:

Valve open.

 Motor/pump-motor unit switched off:

Valve closed.

See Fig. 12, Pg. 32.

NOTICE

The following is dependent on
the operating mode:

 when and how the pump-

motor unit must be filled with
operating liquid the first time,

 how the pump-motor unit is

put into operation.

The specifications for this are
contained in Chapter 7,
"Installation", Pg. 22ff., and
Chapter 8, "Commissioning",
Pg. 28ff.

© Gardner Denver Deutschland GmbH 19 / 64 610.48060.40.000

Transport and Handling

6 Transport and Handling



WARNING

Danger from tipping or falling
loads!

Prior to transport and handling
make sure that all components
are securely assembled and
secure or remove all components
the fasteners of which have been
loosened!



CAUTION

Tipping or falling can lead to
crushing, broken bones etc.!

Sharp edges can cause cuts!

Wear personal safety equipment
(protective helmet, protective
gloves, safety shoes) during
transport!

Packing:

On delivery the pump-motor unit is bolted to a
pallet and covered with a cardboard box.
To unpack, remove the cardboard box and
unscrew the securing bolts on the feet of the
pump-motor unit.

Manual handling:



WARNING

Danger from lifting heavy
loads!

Manual handling of the unit is
only permitted within the
following limits:

 max. 30 kg [max. 66 lbs]

for men

 max. 10 kg [max. 22 lbs]

for women

 max. 5 kg [max. 11 lbs]

for pregnant women

For the weight of the pump-motor
unit, see Chapter 4.1,
"Mechanical data",
Section "Weight", Pg. 16.

For weights above the given
values use suitable lifting
appliances and handling
equipment!

Handling by means of lifting equipment:



WARNING

Danger from tipping or falling
loads!

When transporting with lifting
equipment, observe the following
basic rules:

 The lifting capacity of lifting

equipment and lifting gear
must be at least equal to the
unit's weight.

For the weight of the pump­motor unit, see Chapter 4.1,
"Mechanical data",
Section "Weight", Pg. 16.

 The pump-motor unit must be

secured so that it cannot tip or
fall.

 Do not stand or walk under

suspended loads!

610.48060.40.000 20 / 64 © Gardner Denver Deutschland GmbH

Transport and handling by means of a crane
and strap belts is advisable.

Transport and Handling

Attach the strap belts as shown in Fig. 4,
Pg. 21:

 Use two strap belts, of which one is routed

under the vacuum pump/compressor
housing, and one under the fan guard.

 The strap belts should be seated securely

in the undercuts so that the unit cannot slip
out.

 The belts must be sufficiently long (spread

angle smaller than 90°).

 Make sure that no damage is caused to any

attached fittings.



WARNING

Danger from tipping loads!

Be sure to observe the routing of
the strap belts as shown in
Fig. 4, S. 21, even if the motor is
provided with attachment points
such as transport eyes or eye
bolts.

Fig. 4: Attachment points

These are solely designed for the
separate transport of the motor,
however not for the different
weight distribution that results for
the mounted vacuum
pump/mounted compressor, so
that the unit could tip!

© Gardner Denver Deutschland GmbH 21 / 64 610.48060.40.000

Installation

7 Installation

7.1 Installation



CAUTION

CAUTION

Danger of crushing from unit
tipping over!

In the unmounted state, the unit
can easily tip due to its weight
distribution!

Wear gloves and safety shoes!
Handle the unit with the
appropriate care!



CAUTION

Danger of damage to the
pump-motor unit due to
overheating!

When installing the unit, make
sure that heat dissipation and
cooling are not obstructed. The
minimum distances specified in
Chapter 4.1, "Mechanical data",
Section "Minimum distances for
heat dissipation", Pg. 16 must be
complied with.

Discharge air of other units may

Danger of tripping and falling!

Make sure the unit does not
present a danger of tripping!



WARNING

For the space requirement and arrangement of
the holes for installing and securing the pump­motor unit, please see Fig. 1, Pg. 13.
For minimum clearances for heat dissipation

not be directly sucked in again!

and cooling, see Chapter 4.1, "Mechanical

Electrical danger!

The pump-motor unit must be
installed so that the electrical
device cannot be damaged by
external influences!

data", Section "Minimum distances for heat
dissipation", Pg. 16.

The pump-motor unit must be installed as
follows:

In particular, the feed pipes must
be securely routed, e.g. in cable
ducts or in the floor.



CAUTION

Danger of injuries from flying
parts!

Select installation so that parts
that are thrown out through the
grate if the external fan breaks
cannot hit persons!

 on level surfaces,
 with shaft in horizontal position,
 on stationary (fixed) surfaces or structures,
 at a maximum height of 1000 m [3280 ft]

above sea level.

Observe the following when installing the
pump-motor unit:

 The load bearing capacity of the base

plate or the foundation must be designed
for at least the weight of the unit.

 The vibration behavior at the operating

location must be taken into account.

The total vibrations of the unit are
dependent on the following factors:

– the characteristic vibrations of the unit,
– the alignment and installation,
– the condition (vibration behavior) of the

load-bearing surface,

– the influences by vibrations of other

parts and system components (external

vibrations).
The maximum permissible value for
vibrations is v

= 4.5 mm/s.

eff

To ensure proper operation and a long

610.48060.40.000 22 / 64 © Gardner Denver Deutschland GmbH

service life of the unit, this value may not be
exceeded.
Generally, this value can be adhered to
without a special foundation or a special
base plate.
The points on the unit for measuring the
vibration speed are shown in Fig. 5, Pg. 23.

Installation

Bolt the feet of the unit to the supporting
surface with suitable securing elements, as
shown in Fig. 6, Pg. 23.

Fig. 5: Points for measuring the vibration
speed

Different installation, e.g. with the shaft in the
vertical position, requires consultation with
service.

Fig. 6: Securing elements for bolting feet to
supporting surface

2BV7 06: M = 4 x M8-6.8
2BV7 07: M = 4 x M10-6.8

© Gardner Denver Deutschland GmbH 23 / 64 610.48060.40.000

Installation

7.2 Electrical connection (motor)

The electrical connection must be carried out
as follows:
 according to the applicable national and

local laws and regulations,

 according to the applicable system-

dependent prescriptions and requirements,

 according to the applicable regulations of

the utility company.



DANGER

Electrical danger!

Malpractice can result in severe
injuries and material damage!



DANGER

Electrical danger!

The electrical connection may be
carried out by trained and
authorized electricians only!



DANGER

Electrical danger!

Before beginning work on the
unit or system, the following
measures must be carried out:

 Deenergize.
 Secure against being

switched on again.

 Determine whether

deenergized.

 Ground and short-circuit.
 Cover or block off adjacent

energized parts.



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

Before beginning work on the
unit or system:

 Interrupt supply of operating

liquid.

 Bleed lines and vacuum

pump/compressor
(depressurize).

CAUTION

Incorrect connection of the motor
can lead to serious damage to
the unit!

Observe the motor rating plate.
It is imperative that the operating conditions
correspond to the data given on the rating
plate!

Deviations permissible without reduction in
performance:

 ±5 % voltage deviation
 ±2 % frequency deviation

Make the connection in accordance with the
circuit diagram in the terminal box.
Connect the protective conductor.

 Use suitable cable lugs when doing so.
 The electrical connection must be

permanently safe.

 Tightening torques for terminal plate

connections:

Thread

Tightening
torque

[Nm]

[ft lbs]

M4 M5

0.8 ... 1.2 1.8 ... 2.5

0.590 ...

0.885

1.33 ...

1.84



WARNING

Electrical danger!

Clearance between bare live
parts and between bare live parts
and ground:

at least 5.5 mm [0.217"] (at a
nominal voltage of V

≤ 690V)

n

Make sure there are no
protruding pieces of wire!

610.48060.40.000 24 / 64 © Gardner Denver Deutschland GmbH

Installation



WARNING

7.3 Connecting pipes/hoses (vacuum
pump/compressor)

Electrical danger!

The terminal box must be free
from

 foreign bodies,
 dirt,
 humidity.

Terminal box cover and cable
entries must be tightly closed so
as to make them dustproof and
waterproof.

Check for tightness at regular
intervals.

For motor overload protection:

 Use motor circuit breakers.
 Set the motor circuit breakers to the

nominal current specified on the rating
plate.

For supply by converter:

 High-frequency current and voltage

harmonics in the motor supply cables can
lead to emitted electromagnetic
interference.

 Use shielded supply cables,

whereby the shield must be installed on
both sides.

 Limit speed:

see Chapter 4.2, "Electrical data", Pg. 16.

CAUTION

If the unit is run dry, the
mechanical seal will be
destroyed in a matter of seconds!

DO NOT switch on as long as the
unit is not filled with operating
liquid!

Fig. 7: Pipe/hose connection of vacuum
pump/compressor

1 Operating-liquid port G ¼"
2 Discharge connection
3 Inlet connection
4 Connection for cavitation protection G ¼"
5 Drain opening G ¼"

To prevent foreign bodies from entering the
unit, all connections are sealed off when
delivered.
Do not remove the sealing plugs until
immediately before connecting the
pipes/hoses.

For the arrangement of the pipe/hose
connection, see Fig. 7, Pg. 25.

The pumped gases/vapors are sucked in via
the inlet connection

(see Chapter 7.3.1,
Pg. 26) and discharged via the discharge
connection (see Chapter 7.3.2, Pg. 26).
For operation the unit must be continuously
supplied with operating liquid.
This is fed in via the operating-liquid port

(see
Chapter 7.3.3, Pg. 26) and discharged
together with the pumped gases/vapors
through the discharge connection

.

© Gardner Denver Deutschland GmbH 25 / 64 610.48060.40.000

Installation

Fill with operating liquid:

7.3.1 Inlet connection

When and how the pump-motor unit must be
filled with operating liquid the first time is
dependent on the operating mode:
 For self-priming operation:

During installation.

 For operation with operating-liquid feed:

After completing installation.

For self-priming operation you now pour
operating liquid into the working space of the
pump-motor unit before you connect the
pipes/hoses to the unit.
To do this, pour operating liquid into the open
inlet connection, discharge connection or
operating-liquid port.
For proper filling quantities, see Chapter 4.3,
"Operating conditions", Section "Operating­liquid filling amount for priming", Pg. 17.

Then attach the pipes/hoses to the unit as
described in the following.



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

During operation, connected
pipes and vessels are
pressurized or vacuumized!

Make sure that all connections
are sufficiently tight! Use only
pipes and vessels of sufficient
strength!

NOTICE

Attach pipes/hoses free of
mechanical tensions.

The inlet connection (Fig. 7, Pg. 25, Item 3) is
marked with an arrow pointing downward (↓).
Connect the inlet pipe here. The pumped
gases/vapors are sucked in via this.

CAUTION

The tightening torque for pipe
connections on intake and
discharge connections may not
exceed 100 Nm [73.8 ft lbs]!

7.3.2 Discharge connection

The discharge connection (Fig. 7, Pg. 25,
Item 2) is marked with an arrow pointing
upward (↑).
Connect the discharge pipe here. Both the
pumped gases/vapors and the operating liquid
are discharged via this pipe.

CAUTION

The tightening torque for pipe
connections on intake and
discharge connections may not
exceed 100 Nm [73.8 ft lbs]!

7.3.3 Operating-liquid port

The operating-liquid port (Fig. 7, Pg. 25,
Item 1) is located between the discharge and
inlet connection.

Connect the feed pipe for the operating liquid
here.

Support the weight of the
pipes/hoses.

610.48060.40.000 26 / 64 © Gardner Denver Deutschland GmbH

7.3.4 Notes

Installation

For operating liquid with
impurities:

 Install a filter, screen or

separator in the supply line if
necessary.

In case of operating liquid with
a high lime content:

 Soften operating liquid
OR
 Decalcify pump-motor unit

regularly (see Chapter 11.1,
"Maintenance", Pg. 36).

To prevent installation residues
(e.g. welding spatter) from
entering the unit,
a start-up screen should be
installed in the inlet pipe for the
first 100 operating hours.

7.4 Accessories

NOTICE

NOTICE

NOTICE

The following accessories are available
according to our catalogue:

 Liquid separator
 Non-return valve
 Connecting and counter flange
 Gas ejector.

See Chapter 13, "Accessories", Pg. 44.

© Gardner Denver Deutschland GmbH 27 / 64 610.48060.40.000

Commissioning

8 Commissioning



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!
Danger due to rotating parts!

The pump-motor unit may only
be put into operation when the
following conditions are met:

 Fan guard and vacuum

pump/compressor housing

8.1 Preparation and start-up

CAUTION

If the pumped gases/vapors
discharged on the pressure side
are passed on,
then it must be ensured that the
maximum discharge pressure of

1.1 bar abs. [16.0 psia] is not
exceeded!

NOTICE

are mounted.

 The lines to the discharge

connection, inlet connection
and operating-liquid port are
attached.

 The lines and connections

have been tested for strength
and leaks.

CAUTION

If a shut-off device is installed in the discharge
pipe:
Make sure that the unit CANNOT be operated

Maximum permissible quantity of
water entrained via the inlet
connection:
See Fig. 13, Pg. 32.

with the shut-off device closed.

If the unit is run dry, the
mechanical seal will be
destroyed in a matter of seconds!

DO NOT switch on as long as the
unit is not filled with operating
liquid!

Fill with operating liquid:

When and how the pump-motor unit must be
filled with operating liquid the first time is
dependent on the operating mode:
 For self-priming operation:

During installation.

 For operation with operating-liquid feed:

After completing installation.

For operation with operating-liquid feed,
you now fill the working area of the unit with
operating liquid.
To do this, open the respective stop valve for
approx. 20 sec.:
 For non-automatic operation:

Stop valve (Fig. 11, Pg. 32, Item 4).

 For automatic operation:

Stop valve in the bypass pipe (Fig. 12,
Pg. 32, Item 4a).

Then proceed with commissioning as
described in the following.

610.48060.40.000 28 / 64 © Gardner Denver Deutschland GmbH

Check connections of the pipes/hoses for
leaks.

Check direction of rotation:

 The direction of flow of the pumped

gases/vapors is marked with arrows on the
intake and discharge connection.

 The intended direction of shaft rotation is

marked with an arrow on the motor
mounting adapter between the intake and
discharge connection, as well as with an
arrow on the fan guard.

 The pump-motor unit may not be allowed to

run dry!
Have you filled it with operating liquid
beforehand (during or after installation)?

See sections "Fill with operating liquid",
Pg. 26 and Pg. 28.

 Briefly switch on pump-motor unit.

 Compare the actual direction of rotation of

the external fan with the intended direction
of shaft rotation as indicated with the
arrows.

 Switch off pump-motor unit again.

 If necessary, reverse the direction of

rotation of the motor.



DANGER

Commissioning



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

Before beginning work on the
unit or system:

 Interrupt supply of operating

liquid.

 Bleed lines and vacuum

pump/compressor
(depressurize).

The further procedure is again dependent
on the unit operating mode:

Electrical danger!

The electrical connection may be
carried out by trained and
authorized electricians only!



DANGER

Electrical danger!

Before beginning work on the
unit or system, the following
measures must be carried out:

 Deenergize.
 Secure against being

switched on again.

 Determine whether

deenergized.

 Ground and short-circuit.
 Cover or block off adjacent

energized parts.

© Gardner Denver Deutschland GmbH 29 / 64 610.48060.40.000

Commissioning

8.2 Self-priming operation

See Fig. 8, Pg. 30.

Here the following must be watched:

Starting the pump-motor unit:

 The pump-motor unit must be pre-throttled

on the inlet side. This means a vacuum of
at least 900 mbar abs. [13.1 psia] must be
present in the inlet pipe (Item B) at switch­on.

 During switch-on, the liquid level in the feed

pipe (Item A) and in the reservoir (Item C)
respectively must be at the same level as
the center of the unit shaft (Item 1).

 During operation the liquid level in the

reservoir (Item C) may not drop below
approx. 1 m [3.28 ft] below the center of
the unit shaft (Item 1).



1 m



3.28 ft

A B

1

2

 Switch on the unit.
 The operating liquid is sucked in.

900 mbar abs

13.1 psia

C

Fig. 8: Self-priming operation

A Feed pipe for operating liquid
B Inlet pipe
C Reservoir for operating liquid

1 Required liquid level when switching on
2 Min. liquid level during operation

610.48060.40.000 30 / 64 © Gardner Denver Deutschland GmbH

8.3 Operation with operating-liquid feed

A

A

See Fig. 9, Pg. 31; and Fig. 10, Pg. 31, as well as Fig. 11, Pg. 32 and Fig. 12, Pg. 32.

Proceed as follows here:

Method A:

Method B:

Commissioning

1) Set pre-pressure of operating liquid (Fig. 9,
Pg. 31):

 Set a pre-pressure p

in the feed pipe for

A

the operating liquid (Item A) around
approx. 1 bar [14.5 psi] above the inlet
pressure p

in the inlet pipe (Item B).

B

2) Start up the unit:
For non-automatic operation (Fig. 11, Pg. 32):

 Open the stop valve (Item 4) manually.

The operating liquid is fed in.

 Switch on the unit.

For automatic operation (Fig. 12, Pg. 32):

 Switch on the unit.
 The solenoid valve (Item 4) opens

and the operating liquid is fed in.

p = p + 1 bar

AB

p = p + 14.5 psi

AB

1) Start up the unit:
For non-automatic operation (Fig. 11, Pg. 32):

 Open the stop valve (Item 4) manually.

The operating liquid is fed in.

 Switch on the unit.

For automatic operation (Fig. 12, Pg. 32):

 Switch on the unit.
 The solenoid valve (Item 4) opens

and the operating liquid is fed in.

2) Check the operating-liquid flow rate:

 with the flow meter (Fig. 11, Pg. 32, and

Fig. 12, Pg. 32, Item 2)
OR
 by measuring the volume of operating liquid

per unit of time that exits at the discharge

connection with a graduated vessel

(Fig. 10, Pg. 31)

3) Set/correct the operating-liquid flow rate:

 via the control valve (Fig. 11, Pg. 32, and

Fig. 12, Pg. 32, Item 3)
 Nominal operating-liquid flow rate:

For nominal values, see Chapter 4.3,

"Operating conditions", Section "Nominal

operating-liquid flow rate", Pg. 17.

B

B

Fig. 9: Setting the operating-liquid flow rate:
Setting pre-pressure

A Feed pipe for operating liquid
B Inlet pipe

Fig. 10: Setting the operating-liquid flow rate:
Measuring the volume with a graduated vessel

A Feed pipe for operating liquid
B Drain pipe for operating liquid

© Gardner Denver Deutschland GmbH 31 / 64 610.48060.40.000

Commissioning

1

32

4

5

6

Fig. 11: Operation with operating-liquid feed: Non-automatic operation

1 Pump-motor unit
2 Flow meter
3 Control valve

1

4 Stop valve
5 Filter
6 Feed pipe for operating liquid

2 3 44a5 6

Fig. 12: Operation with operating-liquid feed: Automatic operation

1 Pump-motor unit
2 Flow meter
3 Control valve

4a Bypass with stop valve (for priming)
5 Filter
6 Feed pipe for operating liquid

4 Solenoid valve, connected to motor

4x

8x

3x

7x

t =



t = 2 s

A

B

Fig. 13: Maximum permissible quantity of water entrained via the inlet connection

A During continuous operation: 3x quantity of operating-liquid flow rate
B Briefly (up to 2 sec.): 7x quantity of operating-liquid flow rate

610.48060.40.000 32 / 64 © Gardner Denver Deutschland GmbH

9 Operation

Operation



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!
Danger due to rotating parts!

The pump-motor unit may only
be put into operation when the
following conditions are met:

 Fan guard and vacuum

pump/compressor housing
are mounted.

 The lines to the discharge

connection, inlet connection
and operating-liquid port are
attached.

 The lines and connections

have been tested for strength
and leaks.

CAUTION

9.1 Self-priming operation

Follow the instructions contained in
Chapter 8.2, "Self-priming operation", Pg. 30
for this operating mode.

9.2 Operation with operating-liquid feed

Start-up

For non-automatic operation (Fig. 11, Pg. 32):

 Open the stop valve (Item 4) manually.

The operating liquid is fed in.
 Switch on the unit.

For automatic operation (Fig. 12, Pg. 32):

 Switch on the unit.
 The solenoid valve (Item 4) opens

and the operating liquid is fed in.

Shut down:

For non-automatic operation (Fig. 11, Pg. 32):

If the unit is run dry, the
mechanical seal will be
destroyed in a matter of seconds!

DO NOT switch on as long as the
unit is not filled with operating
liquid!



WARNING

Danger of burns and scalding
from hot surfaces of the pump­motor unit and from hot fluids!

Do not touch during operation!
Allow to cool after shut-down!

NOTICE

 Switch off the pump-motor unit.
 Close the stop valve (Item 4) manually.

Feeding of the operating liquid is cut off.
 The following applies for the control valve

(Item 3) for setting the operating-liquid flow

rate:

In case of an interruption in operation, the

valve setting (i.e. the valve position or the

open valve cross-section) is not changed.

For automatic operation (Fig. 12, Pg. 32):

 Switch off the pump-motor unit.
 The solenoid valve (Item 4) closes,

and feeding of the operating liquid is cut off.
 The following applies for the control valve

(Item 3) for setting the operating-liquid flow

rate:

In case of an interruption in operation, the

Maximum permissible quantity of
water entrained via the inlet
connection:
See Fig. 13, Pg. 32.

valve setting (i.e. the valve position or the

open valve cross-section) is not changed.

© Gardner Denver Deutschland GmbH 33 / 64 610.48060.40.000

Shut-Down and Longer Standstills

10 Shut-Down and Longer Standstills

10.1 Draining



DANGER

Electrical danger!

Before beginning work on the
unit or system, the following
measures must be carried out:

 Deenergize.
 Secure against being

switched on again.

 Determine whether

deenergized.

 Ground and short-circuit.
 Cover or block off adjacent

energized parts.



WARNING

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

Before beginning work on the
unit or system:

 Interrupt supply of operating

liquid.

 Bleed lines and vacuum

pump/compressor
(depressurize).

 Switch off the pump-motor unit.
 The above safety precautions apply when

working on the unit or system.

 Provide suitable catch containers below the

vacuum pump/compressor housing.

 Open the screw plug (Fig. 7, Pg. 25,

Item 5).

 Allow the liquid to drain out.
 Close the screw plug again,

tightening torque T

= 2 ... 3 Nm

t

[1.48 ... 2.21 ft lbs].

10.2 Preparing for longer standstill

Before a longer standstill (from approx.
4 weeks) or when there is danger of frost,
proceed as follows:

 Drain pump-motor unit as described in

Chapter 10.1, "Draining", Pg. 34.
 Remove the pipe/hose from the intake or

discharge connection.
 Pour ½ l [0.132 gal (US); 0.110 gal (UK)] of

preservative (rust protection oil, e.g.

Mobilarma 247 form Mobil Oil)

into the open intake or discharge

connection.
 Close the intake and discharge connection,

as well as the operating-liquid port and

remount the disconnected pipes/hoses.
 Guide a M6 or M8 bolt (depending on the

type) with a sufficient shank length through

the center opening into the fan guard and

screw into the shaft end on the external fan

side (see Fig. 14, Pg. 34).

 Turn the shaft by hand using the bolt.

 Remove the M6 or M8 bolt again.

You have two options for the standstill:



Either the pump-motor unit remains

connected in the system,

or the unit is removed for storage.

Fig. 14: Pour in preservative and turn shaft

610.48060.40.000 34 / 64 © Gardner Denver Deutschland GmbH

10.3 Storage conditions

This chapter applies in the following cases:

 new pump-motor units,
 pump-motor unit that are already installed

in a system and were prepared for a longer
standstill, as described in Chapter 10.2,
"Preparing for longer standstill", Pg. 34.

To prevent standstill damage during storage,
the environment must provide the following
conditions:

 dry,
 dust-free,
 low-vibration (effective value of vibration

speed v

≤ 0.2 mm/s [0.008"/sec]).

eff

Take the following measures for

commissioning following a longer
standstill:

 Measure the insulation resistance of the

motor.
In case of values ≤ 1kΩ per volt of nominal
voltage, dry winding.

 Drain off preservative, as described in

Chapter 10.1, "Draining", Pg. 34.
Subsequent cleaning of the pump-motor
unit is not required.
Dispose of preservative in accordance with
the manufacturer's specifications.

 For new pump-motor units:

Install pump-motor unit as described in
Chapter 7, "Installation", Pg. 22.
Commission the pump-motor unit as
described in Chapter 8, "Commissioning",
Pg. 28.

For pump-motor unit that are already
installed in a system:
Commission the pump-motor unit as
described in Chapter 8, "Commissioning",
Pg. 28.

Shut-Down and Longer Standstills



DANGER

Electrical danger!

Work on electrical installations
may be carried out by trained
and authorized electricians only!

© Gardner Denver Deutschland GmbH 35 / 64 610.48060.40.000

Servicing

11 Servicing



DANGER

Electrical danger!

Before beginning work on the
unit or system, the following
measures must be carried out:

 Deenergize.
 Secure against being

switched on again.

 Determine whether

deenergized.

 Ground and short-circuit.
 Cover or block off adjacent

energized parts.



WARNING



WARNING

Danger of burns and scalding
from hot surfaces of the pump­motor unit and from hot fluids!

Do not touch during operation!
Allow to cool after shut-down!



WARNING

When working on the unit,
there is a danger of injury,
e.g. in the form of cuts/cutting
off, crushing and burns!

During transport/handling as well
as assembly and disassembly
always wear personal protective

Danger due to gauge pressure
and vacuum!

Danger due to escaping fluid!

equipment (safety helmet,
protective gloves, safety boots)!

Before beginning work on the
unit or system:

 Interrupt supply of operating

liquid.

 Bleed lines and vacuum

pump/compressor
(depressurize).



WARNING

Danger from rotating external
fan of unit!

It is prohibited to remove the fan
guard!

11.1 Maintenance

The pump-motor unit is largely maintenance­free.

However, if dirt or solid matter (e.g. sand) or
lime deposits get into the unit through the
operating liquid and/or the pumped
gases/vapors, then it is necessary to clean the
unit at regular intervals to prevent the impeller
from jamming up and to avoid wearing of the
impeller and the vacuum pump/compressor
housing.



WARNING

Refer to the following table:

Danger from rotating impeller
of unit!

Do not remove the vacuum
pump/compressor housing until
after the unit has been shut down
and the impeller has come to a
complete stop!

Consider that the impeller has a
certain run-out!

610.48060.40.000 36 / 64 © Gardner Denver Deutschland GmbH

Contamination/Problem Remedy

Servicing

Dirt collects in the motor
cooling fins.

Fine-grain dirt (e.g. sand) get
into the vacuum
pump/compressor with the
operating liquid or pumped
gases/vapors.

Impeller is jammed.

 Clean the motor cooling fins at regular intervals.

Install a liquid separator, filter or screen in the feed pipe.

OR

Regularly dismantle and clean the vacuum pump/compressor housing as
follows:

 Shut unit down.
 Drain the pump-motor unit as described in Chapter 10.1, "Draining",

Pg. 34.

 Unscrew the housing with a 36 mm [

3

/8"] wrench (in direction of arrow

shown on housing) (see Fig. 15, Pg. 38).

 Remove the housing.
 Dirt has collected in the housing. Rinse out the housing.
 Screw on the housing again (opposite direction of arrow shown on

housing) and tighten with a tightening torque of 50 Nm [36.9 ft lbs].

 When commissioning the pump-motor unit, proceed as described in

Chapter 8, "Commissioning", Pg. 28.

 Shut unit down.
 Guide a M6 or M8 bolt (depending on the type) with a sufficient shank

length through the center opening into the fan guard and screw into the
shaft end on the external fan side (see Fig. 16, Pg. 38).

 Free the shaft using the bolt.
 Remove the bolt again.

Extremely hard water used
as operating liquid
Lime content > 15°dH).

Soften operating liquid.

OR

Decalcify the pump-motor unit at intervals of 3 months as follows (also see
Fig. 16, Pg. 38):
 Wear personal protective equipment (protective gloves and safety

goggles),

 Shut unit down.
 Drain the pump-motor unit as described in Chapter 10.1, "Draining",

Pg. 34.

 Remove pipes/hoses.
 Fill the unit with decalcifying liquid through one of the connection

openings. Use 10% solution of acetic acid or another commercially
available decalcifying agent.

 Allow the decalcifying liquid to soak for at least 30 minutes.
 Turn the shaft occasionally during this time. To do this, guide a M6 or M8

bolt (depending on the type) with a sufficient shank length through the
center opening into the fan guard and screw into the shaft end on the
external fan side (see Fig. 16, Pg. 38).

 Turn the shaft using the bolt.
 Remove the bolt again.
 Drain the decalcifying liquid out of the unit. To do this, proceed as

described in Chapter 10.1, "Draining", Pg. 34.

 Mount pipes/hoses.
 When commissioning the pump-motor unit, proceed as described in

Chapter 8, "Commissioning", Pg. 28.

 The decalcifying liquid can be disposed of in the sewer system.

© Gardner Denver Deutschland GmbH 37 / 64 610.48060.40.000

Servicing

Contamination/Problem Remedy

Dirt gets into the air
passages (fan guard,
external fan, cooling fins) of
the motor.

1

Clean the motor air passages regularly. To do so, proceed as follows:
 Carry out protective measures for the use of compressed air:

Wear personal protective equipment (protective gloves and safety
goggles),
secure surroundings. Remove objects lying around.

 Blow in compressed air through the fan guard grate.
 It is prohibited to remove the fan guard!

2

Fig. 15: Removing vacuum pump/compressor housing

Carry out with 36 mm [3/8"] open-end wrench.

Fig. 16: Pouring in decalcifying agent and freeing shaft by turning

610.48060.40.000 38 / 64 © Gardner Denver Deutschland GmbH

Servicing

11.2 Repairs/troubleshooting

Fault Cause Remedy Carried out by

Motor does
not start,
no motor
noise.

Motor does
not start,
humming
noise..

At least two
power supply
leads interrupted.

One power
supply lead
interrupted.

Impeller is
jammed.

Impeller
defective.

Motor bearings
defective.

Check fuses, terminals and cables for open

Electrician

circuit. Eliminate open circuit.

Check fuses, terminals and cables for open

Electrician

circuit. Eliminate open circuit.

Free shaft by turning.

Operator

See Chapter 11.1, "Maintenance", Pg. 36.

Decalcify vacuum pump/compressor.

Operator

See Chapter 11.1, "Maintenance", Pg. 36.

Drain and clean vacuum pump/compressor if

Operator
necessary.
See Chapter 11.1, "Maintenance", Pg. 36.

Check and correct impeller gap setting if

Service
necessary.

Replace impeller. Service

Replace motor bearings. Service

Protective
motor switch
trips when
motor is
switched on.

consumption
too high.

Unit does not
generate
vacuum.

Winding short­circuit.

Motor
overloaded.

Counter-pressure
at discharge
connection too
high.

Share of liquid
also fed too high.

Impeller is
jammed.

Lime or other
deposits.

No operating
liquid.

Have winding checked. Electrician

Throttle operating-liquid flow rate.

Operator
See Chapter 8.2, "Self-priming operation", Pg. 30
or 8.3, "Operation with operating-liquid feed",
Pg. 31.

Reduce counter-pressure. Operator

Reduce share of liquid also fed. Operator

See "Motor does not start,

Service
humming noise."

Decalcify vacuum pump/compressor.

Operator Power
See Chapter 11.1, "Maintenance", Pg. 36.

Clean vacuum pump/compressor.

Operator
See Chapter 11.1, "Maintenance", Pg. 36.

Ensure proper operating-liquid flow rate.

Operator
See Chapter 8.2, "Self-priming operation", Pg. 30
or Chapter 8.3, "Operation with operating-liquid
feed", Pg. 31.

Severe leak in the

Seal leak in the system. Operator

system.

Wrong direction
of rotation.

© Gardner Denver Deutschland GmbH 39 / 64 610.48060.40.000

Reverse direction of rotation by interchanging two
connecting leads.

Electrician

Servicing

Fault Cause Remedy Carried out by

Unit
generates
insufficient
vacuum.

Unit too small. Use larger unit. Operator

Operating-liquid
flow too low.

Increase operating-liquid flow rate to up to 2x the
nominal flow rate.

Operator

See Chapter 8.2, "Self-priming operation", Pg. 30
or Chapter 8.3, "Operation with operating-liquid
feed", Pg. 31.

Operating liquid
too warm
(nominal
temperature:

Cool or increase operating-liquid flow,
See Chapter 8.2, "Self-priming operation", Pg. 30
or 8.3, "Operation with operating-liquid feed",
Pg. 31.

Operator

15°C [59 °F]).

Inspect impeller. To do so, proceed as follows:

Operator Erosion.

 Shut unit down.
 Drain the pump-motor unit as described in

Chapter 10.1, "Draining", Pg. 34.

 Unscrew the housing with a 36 mm [

3

/8"]
wrench (in direction of arrow shown on
housing) (see Fig. 15, Pg. 38).

 Remove the housing.
 Examine the impeller for erosion.
 Have the impeller replaced by Service if

necessary.

 Screw on the housing again (opposite

direction of arrow shown on housing) and
tighten with a tightening torque of 50 Nm [36.9
ft lbs].

 When commissioning the pump-motor unit,

proceed as described in Chapter 8,
"Commissioning", Pg. 28.

Replace affected components. Service

Slight leak in the

Seal leak in the system. Operator

system.

Mechanical seal

Replace mechanical seal. Service

leaky.

screeching
noise.

Cavitation of
vacuum
pump/compressor
.

Operating-liquid
flow rate too high.

Connect cavitation-protection hose of liquid
separator (see Chapter 13.5, "Cavitation
protection", Pg. 49) or clean cavitation-protection
equipment.

Check operating-liquid flow rate and reduce if
necessary. See Chapter 8.3, "Operation with

Operator Abnormal

Operator

operating-liquid feed", Pg. 31.

Unit leaky. Seals defective. Check seals. Service

610.48060.40.000 40 / 64 © Gardner Denver Deutschland GmbH

11.3 Spare parts

11.3.1 Ordering nash_elmo spare parts

 The pump-motor unit must be delivered
When ordering nash_elmo spare parts, always
indicate the following:

 Only the original packing should be used for

 Type designation ("2BV...", "2BH..." or

 A declaration of clearance must be included

"2BL..."), complete with all additions
(as per rating plate)

 Serial number ("No E"), 13-digit

(as per rating plate)

 Part item number, 4-digit

 The original rating plate of the pump-motor

(as per parts list for exploded view,
Chapter 14, "Exploded View with Parts
List", Pg. 50)

Example of an order:

2BV7071-1AH08S(-Z) = Type

designation
No E F2 7 45688 70 010 = Serial number
047 = Part item #
Impeller = Part

designation

All parts of the parts list for the exploded view
are available from the manufacturer under the
corresponding item number.
See Chapter 14, "Exploded View with Parts
List", Pg. 50.

In case of inquiries, the serial number (No E)
of the pump-motor unit must be specified in
accordance with the rating plate.

11.3.2 Ordering standardized parts

Commercially available standardized parts can
be purchased on the open market.
When doing so, observe the information in the
parts list exactly, especially the design,
dimensions, property class etc.

11.4 Service/After-sales service

Our Service is available for work (in particular
the installation of spare parts, as well as
maintenance and repair work), not described in
these operating instructions (see front page of
these operating instructions).

Observe the following when returning pump­motor unit:
 Before shipping:

– Drain the pump-motor unit so that it is

residue-free,
as described in Chapter 10.1, "Draining",
Pg. 34.

Servicing

– Clean the unit on the inside and outside,

as described in Chapter 11.1,
"Maintenance", Pg. 36.

complete, i.e. not dismantled.

shipment.

with the shipment,
as described in Chapter 11.5,
"Decontamination and Declaration of
Clearance", Pg. 42.

unit must be properly mounted, intact and
legible.
All warranty claims are voided for pump­motor units delivered for a damage
expertise without the original rating plate or
with a destroyed original rating plate.

© Gardner Denver Deutschland GmbH 41 / 64 610.48060.40.000

Servicing

11.5 Decontamination and Declaration of

Clearance

NOTICE



WARNING

Danger from flammable,
caustic or toxic substances!

To protect the environment and
persons, the following applies:

Pump-motor unit which have
come into contact with
dangerous substances must
always be decontaminated
before being passed on to a
workshop!

A so-called Declaration of Clearance must be
included with each pump-motor unit that is
given to a workshop for inspection,
maintenance or repair.

The declaration of clearance
 is provided as a pre-printed form for

photocopying on Pg. Fehler! Textmarke
nicht definiert.,

 is legally binding,
 must be filled out and signed by authorized,

qualified personnel,

 must be issued for each unit sent in (i.e. a

separate declaration for each unit),

 must be attached outside on the packing of

the unit,

 should be sent to as a copy by fax the

workshop conducting the work prior to
shipment.

This ensures
 that the unit has not come into contact with

dangerous substances,

 that a unit that has come into contact with

dangerous substances has been sufficiently
decontaminated,

 that the inspection, maintenance or repair

personnel can take the required protective
measures if necessary.

The inspection/maintenance/
repair of the unit at the workshop
will not be begun
until the declaration of clearance
has been received!

If the declaration of clearance is
not included with the shipment,
delays may result!

610.48060.40.000 42 / 64 © Gardner Denver Deutschland GmbH

Disposal

12 Disposal

Have the entire pump-motor unit scrapped by a suitable disposal company. No special measures are
required when doing so.

For additional information on disposing of the unit, ask service.

© Gardner Denver Deutschland GmbH 43 / 64 610.48060.40.000

Accessories

13 Accessories

13.1 Flanges

The pipes on the intake and discharge side are
connected to intake and discharge connections
via the flanges.

See Fig. 17, Pg. 44.

2BV7 06: G1
2BV7 07: G1½

2BV7 06: 30 Nm (22.13 ft lb)
2BV7 07: 50 Nm (36.88 ft lb)

13.2 Non-return valve

The non-return valve is basically a valve with a
plate seat. Its function is to prevent the
pumped gases/vapors as well as the operating
liquid from flowing back out of the pump in
case the operation of the pump-motor unit is
interrupted. It is mounted on the inlet
connection of the unit for this purpose.

See Fig. 18, Pg. 44.

2BV7 06: G1
2BV7 07: G1½

Fig. 17: Flanges

Mounting

The flanges are mounted when connecting the
pipes/hoses, as described in Chapter 7.3,
"Connecting pipes/hoses (vacuum
pump/compressor)", Pg. 25.

Proceed as follows:

 Screwing flanges onto intake and discharge

connections.
Use commercially available liquid sealant
(e.g. Loctite) when doing so.
Tightening torque: dependent on the
sealant.

 Screw intake and discharge connections

onto flanges.
Use commercially available liquid sealant
(e.g. Loctite) when doing so.
Tightening torque: dependent on the
sealant.

Fig. 18: Non-return valve

Mounting

The non-return valve is mounted when
connecting the pipes/hoses, as described in
Chapter 7.3, "Connecting pipes/hoses
(vacuum pump/compressor)", Pg. 25.

Proceed as follows:

 Screw on the non-return valve with the

arrow pointing downward on the inlet

connection.
Use commercially available liquid sealant
(e.g. Loctite) when doing so.
Tightening torque: dependent on the
sealant.

 Screw the inlet pipe onto the non-return

valve.
Use commercially available liquid sealant
(e.g. Loctite) when doing so.
Tightening torque: dependent on the
sealant.

610.48060.40.000 44 / 64 © Gardner Denver Deutschland GmbH

13.3 Gas ejector

Mounting

Accessories

The gas ejector is used when an inlet

pressure of the unit in the range from
40 mbar [0.580 psi] to 10 mbar [0.145 psi] is

to be achieved.
The gas ejector compresses the pumped
gases/vapors sucked in to the inlet pressure of
the pump-motor unit.

Ambient air at 20°C [68 °F] and 1013 mbar
[14.7 psi] is used as a propellant. This air may
not contain any liquid droplets.

See Fig. 19, Pg. 45.

Fig. 19: Gas ejector

The gas ejector is mounted when connecting
the pipes/hoses, as described in Chapter 7.3,
"Connecting pipes/hoses (vacuum
pump/compressor)", Pg. 25.

Proceed as follows:

 Screw the gas ejector onto the inlet

connection.
Use commercially available liquid sealant
(e.g. Loctite) when doing so.
Tightening torque: dependent on the
sealant.

 Screw the inlet pipe onto the gas ejector.

Use commercially available liquid sealant
(e.g. Loctite) when doing so.
Tightening torque: dependent on the
sealant.

 With soiled ambient air:

Screw a propellant line onto the gas ejector.

When evacuating containers, the gas ejector
operates as a throttle in the range from
1000 mbar [14.5 psi] to approx. 100 mbar
[1.45 psi]. To achieve fast venting times here,
the gas ejector can be bypassed with a bypass
pipe. The bypass pipe must be closed if the
gas ejector is to be effective. The best point for
switching over to operation with the gas ejector
is at approx. 40 mbar [0.580 psi].

© Gardner Denver Deutschland GmbH 45 / 64 610.48060.40.000

Accessories

13.4 Liquid separator

The liquid separator is mounted on the
discharge connection. Its functions consists of
separating the discharged operating liquid form
the pumped gases/vapors. Part of this
separated operating liquid can be fed back to
the pump-motor unit via the operating-liquid
port. The rest is drained off and replaced with
fresh operating liquid.

Operation with a liquid separator and operating
water return is the operating mode
recommended for the pump-motor unit.

The procedure for mounting the liquid
separator on the pump-motor unit is shown in
Fig. 20, Pg. 47, and Fig. 21, Pg. 48. Here the
following applies:

1) Remove the plug at the top and bottom

on the liquid separator.

2) Screw the hose nipple into the holes on

the liquid separator. Use commercially
available liquid sealant (e.g. Loctite)
when doing so.
 Top hole:

Angled hose nipple.

 Bottom hole:

Straight hose nipple.

For L-BV7 2BV7 060 and 2BV7 061:
The premounted reducer on the liquid
separator is required. Therefore:
 Remove the reducer from the liquid

separator.

 Seal off thread. Use commercially

available liquid sealant (e.g. Loctite)
when doing so.

 Screw the reducer into the liquid

separator again.

For L-BV7 2BV7 070 and 2BV7 071:
The premounted reducer on the liquid
separator is not required. Therefore:
 Remove the reducer from the liquid

separator and dispose of it.

3) Screw the hose nipple into the hole
provided on the pump-motor unit. Use
commercially available liquid sealant
(e.g. Loctite) when doing so.
 Operating-liquid port:

Angled hose nipple, directed toward
the front.

 Connection for cavitation protection:

Angled hose nipple, directed upward.

4) Mount the "T" hose nipple on the angled
hose nipple on the operating-liquid port
with the hose clamp.

5) Place the liquid separator on the
discharge connection and tighten it by
hand. Use commercially available liquid
sealant (e.g. Loctite) when doing so.

6) Mount the hose for returning the
operating liquid (see arrow) with hose
clamps.
 On the liquid separator:

Mount the hose on the lower hose
nipple.

 On the pump-motor unit:

Mount the hose on the side
connection of the "T" hose nipple
(operating-liquid port).

7) Mount the cavitation-protection hose
(see arrow) with hose clamps.
 On the liquid separator:

Mount the hose on the upper hose
nipple.

 On the pump-motor unit:

Mount the hose on the hose nipple of
the cavitation protection connection.

8) Side view of the mounted liquid
separator.
A = Connection for feed pipe for fresh
operating liquid.
B = Connection for draining off
separated operating liquid.

610.48060.40.000 46 / 64 © Gardner Denver Deutschland GmbH

1 2

Accessories

3 4

Fig. 20: Mounting liquid separator, Part 1 of 2

© Gardner Denver Deutschland GmbH 47 / 64 610.48060.40.000

Accessories

5 6

7 8

Fig. 21: Mounting liquid separator, Part 2 of 2

610.48060.40.000 48 / 64 © Gardner Denver Deutschland GmbH

13.5 Cavitation protection
Cavitation is understood to be the production

and sudden implosion of gas bubbles in the
liquid being fed. If the pressure in the vacuum
pump/compressor drops below the evaporation
pressure of the liquid (on the intake side or in
constricted areas), gas bubbles form. When
the pressure increases above the evaporation
pressure again (on the discharge side or at
points with a larger cross-section), these gas
bubbles collapse while forming high pressure
peaks, which may lead to particles being torn
out of the housing wall and impeller. Noise is
radiated. Material destruction of the pump­motor unit is possible. To prevent this,
measures should be taken for cavitation
protection.

To protect the unit from cavitation, connect the
cavitation-protection hose of the liquid
separator to the connection for cavitation
protection (Fig. 7, Pg. 25, Item 4).

Accessories

© Gardner Denver Deutschland GmbH 49 / 64 610.48060.40.000

Exploded View with Parts List

14 Exploded View with Parts List

14.1 Parts list

Part
Item
No.

001 Motor casing,

002 Vacuum

005 Motor rotor

006 Feather key

007 Deep-groove ball

008 Deep-groove ball

025 Screw

026 Motor mounting

027 Circlip

033 Shaft sealing/CD ring

035 Mechanical seal

036 Washer

037 Spring-type straight

042 Terminal box,

045 Screw

047 Impeller

049 Port plate

* NOTE:

Only with 2BV7 061, 2BV7 070 and 2BV7 071.

Part Designation

complete

pump/compressor
housing

bearing

bearing

adapter

pin

complete

Part

Part Designation
Item
No.

050 Valve plate

051 Intercepting plate

053 Special screw

058 O-ring

068 Screw plug

069 Sealing ring

072 Washer for cavitation

protection
079 Screw plug

080 Sealing ring

095 Cover

125 Screw

127 Retaining ring

405 End shield

409 Nut

410 O-ring

451 Screw

452 Shaft sealing/CD ring

455 Spring strap*

459 Nut

467 Bearing screw-down

set

Part

Part Designation
Item
No.

500 Fan guard

501 External fan

503 Special screw

505 Feather key

506 Circlip

640 Terminal-box upper

section
641 Gasket

642 Screw

650 Terminal board,

complete
651 Screw

661 Clamping strap

662 Lock washer

663 Screw

675 Nut

680 Terminal box lid

681 Gasket

682 Special screw

690 Blind plug

691 Blind plug

610.48060.40.000 50 / 64 © Gardner Denver Deutschland GmbH

14.2 Exploded view

045

049

051

053

058

035

079

037

080

072

Exploded View with Parts List

027

007

033

026

069

025

A

127

050

047

125

002

Fig. 22: Exploded view: vacuum pump/compressor section

(Example, delivered version may differ in some details)

036

068

6104806001001

© Gardner Denver Deutschland GmbH 51 / 64 610.48060.40.000

Exploded View with Parts List

682

680

681

651

650

642

042

640

690

641

691

663

662

661

095

005

006

001

A

Fig. 23: Exploded view: motor section

(Example, delivered version may differ in some details)

* NOTE:
Only with 2BV7 061.

503

500

501

452

451

450

455 *

467

008

610.48060.40.000 52 / 64 © Gardner Denver Deutschland GmbH

Exploded View with Parts List

Fig. 24: Exploded view: motor section

(Example, delivered version may differ in some details)

* NOTE:
Only with 2BV7 070 and 2BV7 071.

© Gardner Denver Deutschland GmbH 53 / 64 610.48060.40.000

EU declaration of conformity

EU declaration of conformity

EU declaration of conformity

Manufacturer:

Gardner Denver Deutschland GmbH
P.O. Box 1510
D-97605 Bad Neustadt / Saale

Responsible for documentation:

Holger Krause
P.O. Box 1510
D-97605 Bad Neustadt / Saale

Designation:

L Series Liquid ring vacuum pump/ compressor
L-BV7
Types 2BV7 060

2BV7 061
2BV7 070
2BV7 071

The liquid ring vacuum pump/compressor described above meets the following applicable Community
harmonisation legislation:

2006/42/EC

Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery,
and amending Directive 95/16/EC

The protection targets of the directive 2006/95/EC have been met

Harmonised standards applied:

EN 1012-2:1996

Compressors and vacuum pumps — Safety requirements — Part 2: Vacuum pumps

+A1:2009

Other technical standards and specifications used:

EN 1012-1:1996

Compressors and vacuum pumps — Safety requirements — Part 1: Compressors

Bad Neustadt/Saale, 23.04.2010

(Place and date of issue)

Thomas Kurth, Managing Director

(Name and function) (Signature)

664.48060.40.000

610.48060.40.000 54 / 64 © Gardner Denver Deutschland GmbH

Form for statement on safety

Form for statement on safety

 For the safety of our employees and to comply with statutory requirements on handling substances harmful to the health and

the environment, this statement must be enclosed, fully completed, with each unit/system sent.

 Without the fully completed statement, repair/disposal is not possible and delays are unavoidable!
 The statement is to be completed and signed by suitably qualified, authorised personnel at the operating organisation.
 In the case of shipment to Germany, the statement is to be completed in German or English.
 The statement is to be attached to the outside of the packing on shipment.
 If necessary, the carrier is to be informed.

1. Product designation (type):

2. Serial number (no. BN):

3. Reason for sending:

4. The unit/system

has not come into contact with hazardous substances. There will be no hazards for personnel or the environment during
repair/disposal. Continue with "6. Legally binding statement“

has come into contact with hazardous substances. Continue with "5. Information on the contamination“

5. Information on the contamination

The unit/system was used in the following application:

and has come into contact with the following classifiable substances or substances presenting a hazard to health/environment:

Trade name: Chemical designation:

The unit/system has been emptied in accordance with the operating instructions, flushed and cleaned externally.

Safety data sheets in accordance with the applicable regulations are enclosed ( sheet).

The following safety precautions are necessary for handling (e.g. personal protective equipment):

6. Legally binding statement

I herewith guarantee that the details specified are true and complete and that I, as signatory, am in a position to judge that this is
so.
We are aware that we are liable to the contractor for any damages arising from incomplete or incorrect specifications. We are
obliged to indemnify the contractor against claims for damages by third parties arising from incomplete or incorrect specifications.
We are aware that, irrespective of this statement, we are directly liable to third parties - in particular including the contractor's
employees tasked with repair/disposal.

Company/institute:

Name, position: Phone:

Street: Fax:

Post code, city:

Country: Stamp:

Date, signature:

© Gardner Denver Deutschland GmbH 610.00250.40.905
P.O. box 1510 Phone: [phone] E-mail: [e-mail] 10.2009
97605 Bad Neustadt Fax: [phone] Internet: www.gd-elmorietschle.com English

Statement on health safety and on the protection of the environment

(if necessary provide more information on an additional sheet)

Hazardous
substance class:

Properties (e.g. toxic, inflammable,
caustic, radioactive):

© Gardner Denver Deutschland GmbH 55 / 64 610.48060.40.000

Index

Index

A

Definitions ....................................................... 7

Design........................................................... 18

Accessories .............................................27, 44

Cavitation protection.................................49

Flanges.....................................................44

Gas ejector ...............................................45

Liquid separator........................................46

Non-return valve.......................................44

After-Sales Service........................................41

Attachment points..........................................21

B

Burns .................................................11, 33, 36

C

CAUTION.........................................................7

Cavitation.................................................40, 49

Cavitation protection......................................49

Commissioning ..............................................28

Commissioning after longer standstill............35

Compression pressure ....................................6

Compressor .....................................................6

Connection

Electrical connection (motor)....................24

Pipes/hoses (vacuum pump/compressor)25

Discharge connection..........................26

Inlet connection ...................................26

Operating-liquid port............................26

Contents ..........................................................3

Continuous operation ....................................12

Converter.......................................................25

Dimensions ................................................... 13

Direction of rotation....................................... 29

Discharge connection ................................... 26

Discharge pressure......................................... 6

Disposal ........................................................ 43

Draining......................................................... 34

Driving side ..................................................... 6

E

Electrical connection (motor) ........................ 24

Electrical data ............................................... 16

Electrical installations.................................... 35

Erosion.......................................................... 40

Exploded view............................................... 50

External fan................................................... 10

F

Fan guard................................................ 10, 11

Filling amount:............................................... 17

Flanges ......................................................... 44

Foreseeable misuse...................................... 12

Frequency deviation...................................... 24

G

Gas ejector.................................................... 45

Gases/vapors, to be transported .................. 12

D

Glossary.......................................................... 6

Graphic symbols ............................................. 8

D side...............................................................6

Damage ...........................................................7

Hazard alerting symbols ............................ 8

Information................................................. 8

Mandatory action symbols......................... 8

DANGER .........................................................7

Prohibition symbols.................................... 8

Data, technical...............................................13

Data, electrical..........................................16

H

Data, mechanical......................................13

Operating conditions ................................16

Declaration of clearance................................55

Declaration of Clearance...............................42

Declaration of Conformity..............................54

Decontamination......................................42, 55

610.48060.40.000 56 / 64 © Gardner Denver Deutschland GmbH

Hair net ........................................................... 9

Hazard alerting symbols ................................. 8

Heat dissipation ............................................ 16

Housing......................................................... 10

Humming noise............................................. 39

I

Information.......................................................8

Injuries .............................................................7

Inlet connection .............................................26

Inlet pressure...................................................6

Installation .....................................................22

Insulation resistance......................................35

Intended Use .................................................12

L

Index

Feed............................................. 19, 31, 33

Filling amount: ......................................... 17

Impurities ................................................. 27

Operating liquid with high lime content.... 27

Priming............................................... 26, 28

Regenerative operation ............... 19, 30, 33

Operating method ......................................... 18

Operating modes .................................... 19, 29

Operation with operating-liquid feed. 19, 31,

33

Automatic operation............................ 19

Non-automatic operation .................... 19

Self-priming operation.................. 19, 30, 33

Operating personnel ..................................... 12

Lifting equipment ...........................................20

Lime deposits ................................................39

Limit speeds ..................................................16

Liquid separator.............................................46

List of Illustrations............................................5

Longer standstill ............................................34

M

Machine ...........................................................6

Machine set .....................................................6

Maintenance ..................................................36

Mandatory action symbols...............................8

Mechanical data ............................................13

Minimum distances........................................16

Misuse, ..........................................................12

Motor circuit breaker......................................25

N

Operating-liquid port ..................................... 26

Operation ...................................................... 33

Ordering spare parts..................................... 41

nash_elmo spare parts ............................ 41

Standardized parts................................... 41

Other deposits............................................... 39

P

Packing: ........................................................ 20

Part item numbers......................................... 50

Parts list ........................................................ 50

Personal safety equipment ............................. 9

Pipes/hoses (vacuum pump/compressor) .... 25

Preservative............................................ 34, 35

Pressure

Compression pressure............................... 6

Discharge pressure.................................... 6

Inlet pressure ............................................. 6

Test pressure............................................. 6

Pressure:......................................................... 6

N side...............................................................6

nash_elmo spare parts..................................41

Noise level .....................................................16

Nominal operating-liquid flow rate ...........17, 19

Non-driving side...............................................6

Pressures...................................................... 16

Prohibition symbols......................................... 8

Protective gloves............................................. 9

pumped gases/vapors .................................. 12

Pump-motor unit ............................................. 6

Non-return valve ............................................44

Q

NOTE...............................................................7

NOTICE ...........................................................7

O

Operating conditions......................................16

Operating Instructions ...............................9, 12

Operating liquid .............................................12

© Gardner Denver Deutschland GmbH 57 / 64 610.48060.40.000

Qualified personnel..................................... 6, 9

R

Repairs.......................................................... 39

Cavitation................................................. 40

Erosion..................................................... 40

Humming noise........................................ 39

Index

Lime deposits ...........................................39

Other deposits ..........................................39

Required space .............................................22

Standstill, longer ........................................... 34

Storage conditions ........................................ 35

Residual risks ................................................11

Running dry ...................................................25

Rust protection oil....................................34, 35

S

Safety...............................................................7

Safety alert symbol ..........................................7

Safety boots.....................................................9

Safety equipment, personal.............................9

Safety helmet...................................................9

Safety precautions...........................................9

Scalding.............................................11, 33, 36

Securing.........................................................11

Service...........................................................41

Servicing........................................................36

Servicing personnel .......................................12

Shaft ..............................................................29

Shutting down................................................34

T

Technical data............................................... 13

Temperatures................................................ 16

Terminal box ................................................. 25

Test pressure.................................................. 6

Transport and handling

Handling by means of lifting equipment... 20

Transport and Handling ................................ 20

Manual handling: ..................................... 20

Troubleshooting ............................................ 39

U

Use, intended................................................ 12

V

Vacuum pump................................................. 6

Vacuum pump/compressor housing ............. 10

Voltage deviation .......................................... 24

Signal words ....................................................7

CAUTION ...................................................7

W

DANGER ....................................................7

NOTE..........................................................7

NOTICE......................................................7

WARNING....................................................... 7

Weight........................................................... 16

WARNING ..................................................7

Standardized parts ........................................41

610.48060.40.000 58 / 64 © Gardner Denver Deutschland GmbH

© Gardner Denver Deutschland GmbH 59 / 64 610.48060.40.000

610.48060.40.000 60 / 64 © Gardner Denver Deutschland GmbH

© Gardner Denver Deutschland GmbH 61 / 64 610.48060.40.000

610.48060.40.000 62 / 64 © Gardner Denver Deutschland GmbH

© Gardner Denver Deutschland GmbH 63 / 64 610.48060.40.000

Elmo Rietschle is a brand of
Gardner Denver‘s Industrial Products
Group and part of Blower Operations.

www.gd-elmorietschle.de

[e-mail]

Gardner Denver
Schopfheim GmbH

Roggenbachstraße 58
79650 Schopfheim · Deutschland
Tel. [phone]
Fax [phone]

Gardner Denver
Deutschland GmbH

Industriestraße 26
97616 Bad Neustadt · Deutschland
Tel. [phone]
Fax [phone]