Sempell Safety Relief Valves - Series VSE-0, IOM, Sempell-EN Manuals & Guides

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

Before installation these instructions must be fully read and understood

Series

VSE 0 Full lift safety relief valve and normal
safety valve.
For media of -196°C to +200°C
The application temperature of 200°C must not
be exceeded during normal operation. In case
of a guaranteed local temperature of the safety
valve not higher than 200°C (e.g. because of a
remote arrangement), the operational medium
temperature of the system to be protected can
be clearly exceeded (up to about 300°C).

Design

Design according to TO.270.01.

• closed spring bonnet

• spring-loaded (cylindrical compression

spring)

Also applicable to the following accessories:

• SN 102, without easing gear

• SN 123, disc for liquids

• SN 124, disc with O-ring

Seat diameter do = 7.5 mm; 9.0 mm

Nominal size: DN 15 and 25, NPS ½ and 1

Observe design data on the tagplate!

ATTENTION!

This operating instruction does not specify the
extent of delivery. It is valid for several sizes,
designs, accessories and additional devices.
It contents generally exceeds the contractual
determined extent of delivery.

1 DANGER AND WARNING INDICATIONS

The construction of the Sempell safety valves
corresponds to the latest state of engineering
and the valid safety regulations.

Nevertheless, improper use or improper

installation can cause risks for the personnel
or can lead to restrictions in regard of
the operational safety. Therefore, the
SempellGmbH recommends the operator of
the safety valves to take appropriate measures
and make sure that the present operating
instructions are read and understood by the
assigned personnel.

APPLICATION LIMITS

It is only allowed to use the valves according to
the details of these operating instructions and
according to the parameters and application
cases agreed in the delivery contract (see
nameplate). The application of the valve has to
take place adequate to the medium tolerances of
the used materials.

WARNINGS FOR THE OPERATING AND
MAINTENANCE PERSONNEL

Before commissioning and maintenance works
familiarise yourself with the legal accident
prevention regulations, the local safety
instructions and this operating instruction and
observe them.
Use the safety valve and its individual parts and
accessories only for the purpose intended byus.

Please observe the following points besides
the notes given in the text:

• Danger of burning at safety valves and with

the connected pipes while operating under
increased temperature.

• Disassembly of the safety valve only in case of

pressureless plant and after cooling down.

• Protection against risks caused by

evaporation also in case of pressureless
system; for information please contact the
safety inspector concerned.

• After assembly check all sealing points in

regard of tightness.

• In case of adjustment make changes at
pressure screw and adjusting ring only with

clearly reduced pressure to avoid unintended
response.

• Carry ear protection during adjustment,

ifnecessary.

• Danger of injury while discharging at

disconnected discharge line.

• Extreme vibrations can lead to inadmissible

increase of operating pressure with the
possibly destruction of the safety valve or to
the destruction of the balanced bellows with
unintentional escape of medium.

Exclusion of liability

Sempell GmbH cannot be held liable in case

of improper maintenance and adjustment of a

Sempell safety valve, use of inadmissible spare
parts or utilities and in case of a temporary or

permanent connection of equipment with the

safety valve which is not approved by us.

Emerson.com/FinalControl VCIOM-02468-EN 18/08© 2017 Emerson. All Rights Reserved.

MA.270.01.1215 E

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

Material specification Area of operating temperatures

16 -196 to +200°C
17 -10 to +200°C

Take the material specification and the admissible pressure from the nameplate of the valve.

2 DESCRIPTION

Spring-loaded full lift safety relief valves and
normal safety valves are direct acting safety
valves to protect pressure tanks against
inadmissible excess-pressure.
A cylindrical compression spring creates the
closing force on the valve disc against the
opening pressure of the medium below the
valve disc. At normal operating conditions the
valve seat will be held tight.
By changing the spring compression it is
possible to change the set pressure. In case
of exceeding set pressure, the pressure of the
medium prevails and the safety valve opens.
With full lift characteristic the safety valve
opens rapidly at full lift and discharges the
total mass flow necessary to prevent a further
pressure increase.
With normal characteristic the safety valve
reaches the lift necessary for the mass flow
to be discharged after the response within a
pressure increase of max. 10%.
After a defined pressure decrease, the safety
valve closes again.
By means of the lifting lever at the cap the
safety valve can be opened by hand at a set
pressure of 85% at least.
The safety valves are type tested and comply

with the requirements of the standards and

regulations.

Use within areas exposed to danger of explosion

The safety valves underwent a hazard analysis
according to code 94/9/EC with the following

result:

• The safety valves do not have a potential
ignition source. ATEX 94/9/EC is not

applicable to these valves.

• The valves safety may be used in the EX range

• Electrical / pneumatical accessories have to

undergo a separate assessment of conformity
according to ATEX.

• The surface temperature does not depend

from the valve itself but from the operational
conditions. Observe while installing.

3 OPERATION

3.1 Warning indications for the operation

Observe safety regulations!

ATTENTION

Unstable behaviour of safety valves such as
chattering or vibrating can destroy the valve seat,
the safety valve or the pipe and thus causing the
failure of the safety function or the shutdown
of the plant. Therefore, observe regulations
and empirical notes regarding design and
dimensioning, fitting and installation.

• Design and dimensioning: do not use larger

safety valves than necessary! In case of back
pressure use safety valves with bellows.

• Fitting and installation: lay supply line as

short as possible. Use as few bends as
possible.

• Keep supply line free from vibrations. Absorb

or avoid pressure surges and waves, e. g.
caused by pumps or other valves.

• Drain the discharge line and the valve body at

their lowest point. Condensate can impair the
function of the safety valve.

• Protect lines and valve against freezing.

3.2 Storage rules

To preclude damages during loading and
unloading, move the valve cautiously.

Maximum weight: 7 kg

At delivery the outsides of all ferritic parts of
the safety valve are supplied with a coat of paint
except the welding edges.

The insides of the body are protected by a
watery corrosion preservative that has a long­term effect because of the film formative active
agents.

All connection inlets are closed by
corresponding caps.
In this state the safety valve can be stored
in closed, dust-free and dry rooms lying on
a pallet without difficulties. Time of storage
approx. six months.

A storage of more than six months asks for
disassembly and visual check of the inner parts
of the safety valve. A weather-protected outside
storage is not allowed.

2

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

For spare parts out of elastic material

(O-rings, scraper rings, rod and piston gaskets)
additionally apply:

Temperature: The temperature of the storage
shall be between 0°C and 25°C since otherwise
a hardening of the material and so a shortening
of durability will follow. Shield heating elements
and lines in heated storeroom so that no direct
heat irradiation arises. The distance between
the heat source and the stocks has to be 1 m
at least.

Moisture: to prevent the formation of
condensate, avoid moist storerooms. A relative
humidity of below 65% is at best.
Lighting: the products of elastic materials
are to protect from direct sun light and from
strong artificial light with a high ultraviolet
part. Therefore supply the windows of the
storerooms with a red or orange (in no case
blue) paint.

Ozone: protect products of elastic materials

from ozone (formation of cracks and

embrittlement). The storeroom may not contain

ozone generating systems (fluorescing sources

of light, mercury vapour lamps, electric
motors,etc.).

Oxygen: protect products out of elastic
materials from draught by storage in
airtight tanks. Oxygen causes cracking and
embrittlement.

If these requirements are guaranteed for

products out of elastic materials, the storage
time is approx. 5 years.

For spare parts out of steel

Store the parts in closed, dust-free and dry
rooms so that damages do not occur.
Especially the following protection measures
have to take place:
Disc (3): wax coat of the gasket, net coat
Guide bush (2): protection by net coat

3.3 Installation instructions

NOTE

Clean pipes before installing safety valves since
otherwise the valve seats can be damaged by
foreign bodies when discharging!

Remove transport protection just before

installation.

Check plant identification and details on the
nameplate.

3.3.1 Installation

The installation zone must be easily accessible
for maintenance works. Required free

space above the safety valve see section
“Dimensions”. In case of large safety valves
provide for additional space for lifting gears, at
least 500 mm.

Position of installation vertical, inlet from

below. Do not brace valve body when fastening;
if necessary compensate bearing of the
supporting brackets.
Lay line in such a way that neither static or
dynamic forces nor forces caused by thermal
expansion may be transferred to the valve body.

PLEASE NOTE

Stresses at the valve body may lead to leaking at
the valve seat!

3.3.2 Inlet line

Arrange safety valve directly at the nozzle of the

tank to be protected, if possible. Otherwise lay
inlet line between tapping point and safety valve
as short and as poor in resistance as possible.
In no case the inlet line diameter must be

smaller than the inlet nominal size at the

safety valve. The pressure loss of the inlet line
must not exceed 3% of the set pressure at the

greatest possible discharge quantity.

Check inlet line in regard of pressure vibrations
according to FBR 153 as far as possible.

ATTENTION

A pressure loss higher than the closing pressure
difference may lead to an unstable, uncontrollable
behaviour of the safety valve; chattering or
vibrating may destroy the valve seat, the safety
valve or the pipe and thus lead to failure of the
safety function or to shutdown of the plant!

For discharge of condensate in case of gases
and vapours, the inlet line must have a slope to
the tapping point of 15 degrees at least.

ATTENTION

Condensate at the inlet of the safety valve
changes the functional behaviour and may lead
to an inadmissible pressure increase. Danger of
explosion!

In case of liquids with temperatures higher than

the ambient temperature, the inlet line must
be assembled with slope to the safety valve, or
designed as a siphon-type bend in front of the
safety valve. Thereby, a heat transmission to
the safety valve is avoided which could impair
the tightness at the valve seat.

X

3

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

3.3.3 Exhaust line

In no case the exhaust line diameter must be

smaller than the outlet nominal size at the

safety valve.

Back pressures in the exhaust line are
admissible up to 15% of the set pressure

ATTENTION

Higher back pressures may lead to an unstable,
uncontrollable behaviour of the safety valve;
chattering or vibrating may destroy the valve seat,
the safety valve or the pipe and thus lead to failure
of the safety function or to shutdown of the plant!

At the deepest point the exhaust line must

be equipped with a drain which is big enough

to discharge minor leaks, e. g. in case of

untight valve seat. Particularly in the open air

exhaust line, valve body and drain must be

protected against icing and freezing, e. g. by

(electrical) trace heating; merely insulation is
not sufficient!

ATTENTION

An icy, frozen or clogged exhaust line leads to the
failure of the safety function! Danger of explosion
in case of excess-pressure!

CAUTION

In case of several safety valves with one common
exhaust line, take special safety precautions for
disassembling of only one safety valve to exclude
danger in case of unintended discharge of other
safety valves!

Recommendation! Sound isolate exhaust line

and/or provide the same with silencer; in doing

so, regard allowable back pressure!

3.3.4 Insulating

In case of hot medium insulate inlet line and
valve body. In case of gases and vapours
insulate inlet line and valve body very carefully
to avoid condensation.

ATTENTION

Condensate at the inlet of the safety valve
changes the functional behaviour and may lead
to an inadmissible pressure increase; danger of
explosion!

The spring bonnet shall not be insulated as with
heated spring the set pressure decreases.

3.4 Pressure test

The response of the safety valves must be
prevented. For this purpose flange off the safety
valve and close the inlet line by means of a
blind flange.

ATTENTION!

After the pressure test, restore und control the
ready-to-operate state!

3.5 Commissioning

The safety valve is delivered ready to operate.

The set pressure is adjusted at works and
secured against unauthorized adjustments

by lead seal. Higher medium temperatures
can lower the set point by about 1% per 100°C

and ask for a readjustment under operating

conditions.

3.6 Operational test

Function and reliability of the safety valves are
proved by the type test. Generally operational
tests are therefore not carried out in the
system. This is usual for steam boiler safety
valves only.

3.7 Discharge test

• Apply ear plugs.

• Slowly increase operating pressure in the

system until the safety valve has fully opened.

• Lower operating pressure until the safety

valve closes.
In case of several discharge tests with hot
medium allow intermediate cooling down of the
safety valve as caused by heating of the spring a
slight decrease of the set pressure is possible.

ATTENTION

When discharging, some leaking medium may
pass at the top of the spring bonnet (8) in case of
unscrewed cap (12)(17). Danger of scalding by hot
medium!

3.8 Adjustment of the set pressure

ATTENTION

A change of the lead sealed spring adjustment
must only take place in the presence of the
competent inspector.

The adjustment of the set pressure takes place
on the test stand. If the set pressure is adjusted

in the plant, the pneumatic measuring device

A 143 should be applied as by means of this
device the set pressure can be adjusted without

increasing the operating pressure.

ATTENTION

Adjusting only with lowered pressure. At operating
pressure working on the adjusting screw (10) may
lead to unintended response of the safety valve.
When discharging, some leaking medium may
pass at the top of the spring bonnet (8) in case of
unscrewed cap (12)(17). Danger of scalding by hot
medium.

Remove lead seal. Unscrew cap (12) or (17). For
cap (17) with easing gear, first screw off stuffing
box (18) including lever (21); in doing so, hold
lever (21) in vertical direction.
Loosen lock nut (11). For working at the

adjusting screw (10) secure stem (4) or (14)

against torsion, as otherwise the valve seat

may be damaged. Hold stem (4) e. g. with a pin
or stem (14) e.g. with a fixed spanner at the

checked hexagonal nut (16).

Tighten adjusting screw (10) (turn right): set

pressure higher

Loosen adjusting screw (10) (turn left): set

pressure lower

After the adjustment secure adjusting screw

(10) with lock nut (11). Assemble cap (12) or (17)
and lead seal.
Standard values for the change of the set

pressure in % for a quarter turn of the adjusting

screw (10):

Orifice letter SKB Changes in %

7.5 10

9.5 8

4

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

3.9 FUNCTIONAL DIFFERENCES

Gases / Vapours:

Opening excess pressure: +5% p or 0.1 bar for p smaller than 3 bar
Closing excess pressure: -10% p or 0.3 bar for p smaller than 3 bar

Liquids:

Opening excess pressure: +10% p
Closing excess pressure: -20% p or 0.6 bar for p smaller than 3 bar

3.10 TROUBLE SHOOTING

Malfunction Cause Remedies

Safety valve opens at different pressures 1. Condensate in the inlet line 1. Improve insulation of line. Observe drain and slope

2. Pressure change by superimposed vibration 2. Suppress vibrations at the safety valve
Safety valve opens and closes in rapid
succession

Closing pressure difference is too great 1. Saturated steam with high moisture 1. Insert spring (6) with higher tension
Safety valve stays open after discharge test 1. Foreign bodies between body seat and disc (3) 1. Repeat discharge test or blow off foreign bodies by

Safety valve fails to close tightly 1. Valve seat damaged 1. Disassemble valve. Rework valve seat and disc (3)

1. Pressure loss in the inlet line is greater than the closing

pressure difference

2. Discharge quantity is too small because the subsequent

flow is too small

3. Admissible back pressure is exceeded in the exhaust line 3. Decrease flow resistance of the blow-off line: e.g. by

4. Dynamic pressure drop in the inlet line, especially in case

of liquids

2. Body forming by pipe forces 2. Lay pipe elastically

3. No slope of the inlet line in case of hot liquids 3. Assemble inlet line with slope to the safety valve or lay

1. Reduce flow resistance of the inlet line: Expand, shorten
or remove constrictions. Fast remedy: Decrease lift (as
far as allowed), therefore diminish outflow

2. Install smaller safety valve or adjust discharge quantity

expanding or shortening the pipe

4. Provide safety valve with a vibration damper

lifting the lever (21). Otherwise disassemble valve

siphon-type bend

4 INSPECTION AND MAINTENANCE WORKS

Inspection intervals depending on frequency

of response and operating conditions,
e.g.annually, under severe conditions twice a

year. Keep certificates about performed works.

During patrols

• Check valve in regard of tightness.

Therefore observe the following indications:

whistling noises, medium emerging at the

bonnet, medium at the drain nozzle or in the

exhaust line.

During each inspection

• Check all gaskets. Replace them if leaky.

• Control seat faces.

• Smooth valve seat and disc (3) with fine

lapping paste. If necessary, replace disc (3).

• Smooth guide areas of the stem (4) and guide

bush (2) without material abrading machining.

• In case of damaged ball (5) replace also
disc(3) and stem (4) at the same time.

At larger intervals, e.g. each 3 years

• Completely disassemble safety valve.

• Clean and control valve parts.

• Rework valve seat and disc (3) with fine

lapping paste; if necessary, replace disc (3). In
case of rework observe functionally important
outlines at the valve seat.

• Replace spring (6) in case of corrosion or
temperature damage and adjust set pressure

again.

• Smooth guide areas of the stem (4) and guide

bush (2) without material abrading machining.

• Lubricate adjusting screw (10).

• Treat sliding guides not in contact with the

medium, fits, gaskets and threads with an
assembling lubricant.

ATTENTION

Do not treat valve seats, metallic sealing surfaces
and sliding guides in contact with the medium.

ATTENTION

For oxygen application all parts in contact with the
medium must be free from oil and grease. Danger
of explosion!

5

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

5 DISASSEMBLY

5.1 Danger and warning indications

ATTENTION

Take work order and wait until the installation is
switched free.

Check if the valve is pressureless and
cooleddown.

Residual medium may escape when opening and
disassembling the valve; also at pressureless
plant further evaporations are possible.

Loosen spring bonnet (8) only when the spring(6)
is released as otherwise the thread of the spring
bonnet (8) cannot absorb the initial stress of the
spring (6).

5.2 Instructions for disassembly

• For works at the adjusting screw (10), secure
stem (4) or (14) against torsion as otherwise
the valve seat can be damaged. Hold stem (4)
e. g. with a pin. Hold stem (14) e.g. with a fixed

spanner at the checked hexagonal nut (16).

5.3 Tools

• fixed spanner 10 - 55 mm

• seal wire, lead seal, lead-sealing pliers

• piston ring pliers

• vernier calliper

• flatnose pliers

• lapping wheel according to valve seat

• side cutting pliers

• fine emery cloth

• pin Ø 2 mm

5.4 Operating materials

5.4.1 Lubricating the removable valve components

To lubricate the removable or detachable
valve components during assembly, use the
greases specified in Table A. Removable or
detachable valve components are all screw
connections, especially pressure-retaining
screw connections, and other components
within the distribution of forces. All removable
or detachable valve components are lubricated
with the same grease if they are lubricated in
the assembly process.
The operating temperature of the valve is
definitive for selecting the grease to be applied
for the removable valve components (cf. Table A).

TABLE A: Greases for lubricating the removable valve components

Design temperature of the valve T

TB < 400°C Molykote® BR 2 Plus

400°C ≤ TB < 700°C Molykote® P 37

[1]

Before applying the grease, ensure that the surfaces are metallically blank (free of oil, grease, etc.) and free of

dirt particles.

B

Grease

[1]

[1]

The greases specified in Table A are manufactured and/or supplied by the following
manufacturers and/or suppliers:

Grease: Manufacturer / Supplier:

®

Molykote

Molykote

BR 2 Plus Dow Corning GmbH Wiesbaden

®

P 37 Dow Corning GmbH Wiesbaden

Rheingaustr. 34, 65201 Wiesbaden

Rheingaustr. 34, 65201 Wiesbaden

5.4.2 Lapping abrasives

It is necessary to use special lapping abrasives that contain finely distributed hardened particles
for lapping seat surfaces on body and disk seats. The lapping abrasive specified in Table B is
recommended by Sempell:

TABLE B: Lapping abrasives, suitable for the finishing of valve seats

Lapping abrasive: Manufacturer / Supplier:

TETRABOR
Boron carbide (F 100 - F 1200)

®

ESK Ceramics GmbH & Co. KG
Max - Schaidhauf-Str. 35, 87437 Kempten - Germany

5.4.3 Further operating materials

Further required operating materials and their usage are specified in Table C and are
manufactured and/or supplied by the following manufacturers and/or suppliers:

TABLE C: Further operating materials

Usage Type Manufacturer / Supplier

Degreasing agent Isopropylalkohol (2-Propanol)
Assembly lubricant (colloidal graphite) for parts
in contact with the medium

®

DAG

156 Acheson Industries,

Dornstadt

ATTENTION

For oxygen application all parts in contact with the medium must be free from oil and grease.
Danger of explosion.

6

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

5.5 Dismantling the safety valve

Remove lead seal. Unscrew cap (12) or (17). For
cap (17) with easing gear, first screw off stuffing
box (18) including lever (21); in doing so, hold
lever (21) in vertical direction. Measure and

record distance between upper edge of stem (4)
or (14) and adjusting screw (10).

Detach and remove checked nuts (15) (16).
Loosen lock nut (11) and release spring (6)

by means of adjusting screw (10). Screw off

spring bonnet (8). Remove spring (6) and spring
plate (7). Lift off disc (3) and guide bush (2)
simultaneously e. g. with a piston ring pliers.

Disassemble stuffing box (18) with lever (21)
only if necessary.

6 ASSEMBLY

Assemble disc (3), guide bush (2), sealing ring

(9), stem (4) or (14), spring (6) with spring plates
(7) and spring bonnet (8). Prestress spring (6)
by means of adjusting screw (10) onto the same

dimension as measured before disassembling.
Thus, the same set pressure as before. Secure

adjusting screw (10) with lock nut (11).

Lay on gasket (13). Screw on cap (12). In case
of cap (17) with easing gear, screw off nuts

(15) (16) at the upper end of the stem (14) and

secure it. Screw open cap (17) and thread in

stuffing box (18) with lever (21) over gasket (24);

in doing so, hold lever (21) in vertical position. In
case of unscrewed cap (17) the lever (21) shall
have a backlash of approx. ± 15°. Otherwise
shift checked nuts (15) (16). Lead seal cap (12)
or (17).

7

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

7 DIMENSIONS FOR MOUNTING BRACKET

d0 d1 d2 f1 f2 f3

H8 +0.10 -0.05 +0.05 -0.10 +0.05

7.5 8.25 9.45 0.50 0.50 0.30

9.0 9.90 10.95 0.50 0.50 0.30

Disc for gases, vapours Disc for liquids SN 123

Valve seat for gases, vapours and liquids

d2
d1

d0

8 METHODS TO PRODUCE SUPERFINISHED
SEALING SURFACES

ATTENTION

Lapping is a precision operation and must
be carried out by trained personnel. Various
operating areas ask for various operating
methods.

8.1 Lapping area production

8.1.1 Disc (3)

Parts with flat seats are normally machine

lapped.

Procedure

Allow boron carbide lapping emulsion (a
mixture of grade 800 lapping powder and
lapping oil) to drip onto the constantly rotating
lapping machine wheel. Load the items to
be lapped into a suitable locator that is set
eccentrically to the table.

The lapping operation takes 15 to 20 minutes

depending on the quality of the prepared

sealing surface. Afterwards the parts will be
polished. In case of parts made of material

1.4980 the parts will additionally polished on

a tin plate with a diamond suspension; grain

size 2 - 3. A sight control and a test with an

interference glass follow to check whether the
surface is plane and not convex or concave.

8.1.2 Valve seat

The preferred method is hand operated
machine lapping in case the valve seat is
installed in the body (screwed in, welded in or
in another connection). Thereby it is important

that the required force is constantly and

steadily transferred through a spring.

Procedure

Grinding and/or lapping foils of different grain
sizes are pasted onto a plain carrier wheel of

the machine. The prepared seating areas with

3.2 Ra roughness are alternately lapped with

grain sizes of 200-600-1000. After lapping with
200 grain size, there should be no visible tool

marks. The change takes place at intervals
of about 1 minute. Lapping is carried out with
oscillating movements. Finally the seating area
is cleaned and visually inspected.

8.2 Lapping area site

As a rule, there is no lapping machine available
so only a manual method or the method
described in Section 8.1.2 can be used.

8.2.1 Disc (3)

Depending upon their size, lap the parts on

glass plates or discs or rings made of grey cast
iron. Lapping abrasive: Tetra Bor lapping paste
(grade 120 to 1200).

Procedure

Up to a size of about 200 mm diameters lap

the parts on the plates. In case of greater
diameters, use the part to be lapped as a pad
and move the discs or rings. Thinly distribute
the lapping abrasive on one side and up a

grain size > 400 additionally sprinkle it with oil

drops. Oscillatingly move the valve part or the
lapping wheel with constant hand pressure.
This operation takes several minutes. Remove
the paste with a cold cleaning and repeat the
procedure using progressively finer lapping
paste. Finally a sight control follows.

Up to a size of approx. 200 mm diameter lap the

discs with a mobile manual lapping machine
according to section 8.1.2.

8.2.2 Valve seat

Procedure see Section 8.1.2.

ATTENTION

Check body seats regularly to verify that the seat
surfaces are still rectangular to the body center. If
this is not the case, restore squareness by using a
flat grinding machine.

9 DECLARATION TO EC-DIRECTIVE

The declaration of conformity can be found in
the documentation.

8

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

10 PART LIST AND ASSEMBLY DRAWINGS

VSE 0 WITHOUT EASING GEAR

12

11

13

10

14

7

8

6

PARTS LIST

Part Name

1 Body
2 Guide bush

3 • Disc
4 • Stem

5 Ball
6 Spring
7 Spring plate
8 Spring bonnet
9 Gasket
10 Adjusting screw
11 Lock nut
12 Cap

13 • Gasket
14 • Stem

15 Round nut
16 Hexagonal nut
17 Cap
18 Stuffing box
19 Gland
20 Shaft
21 Lever
22 Packing
23 Hexagonal nut
24 • Sealing ring
25 Inlet flange
26 Outlet flange
27 Gasket
28 Disc for liquids
30 Disc with O-ring

• Recommended spare parts

9

2

5

28

1

9

SEMPELL SERIES VSE 0 SAFETY RELIEF VALVES

Operating instructiOns

VSE 0 WITH EASING GEAR

17

16

15

19

23

22

18

20

24

11

13

10

14

21

7

8

6

9

2

5

3

1

Technical Information and Customer Service:
Sempell GmbH
Werner-von-Siemens-Straße

41352 Korschenbroich

Germany

Phone [phone]
Fax [phone]

Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.

Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Sempell is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson
and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by

our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without

notice.

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