Burkert 2730, 2731, 2731 K Operating Instructions Manual
Operating Instructions
Bedienungsanleitung
Manuel d‘utilisation
Type 2730 / 2731 / 2731K
DN 15 - 50
Piston controlled diaphragm control valve
Kolbengesteuertes Membranregelventil
Vanne de réglage à membrane commandée par piston
We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© 2000-2012 Bürkert Werke GmbH
Operating Instructions 1207/11_EU-ML_00803906 / Original DE
Piston-controlled diaphragm control valve Type 2730 / 2731 / 2731K
1. OPERATING INSTRUCTIONS ...................................................................5
1.1. Symbols ..............................................................................................5
1.2. Definition of term “device” ..............................................................5
2. AUTHORIZED USE .........................................................................................6
2.1. Restrictions ........................................................................................ 6
3. BASIC SAFETY INSTRUCTIONS .............................................................6
3.1. Instructions for use in explosion protected area (Ex area) ......7
4. GENERAL INFORMATION ...........................................................................9
4.1. Contact address ............................................................................... 9
4.2. Warranty ............................................................................................. 9
4.3. Information on the internet .............................................................9
5. PRODUCT DESCRIPTION ...........................................................................9
5.1. General description ......................................................................... 9
5.2. Properties ........................................................................................... 9
5.3. Structure and function ..................................................................10
6. TECHNICAL DATA ........................................................................................11
6.1. Conformity .......................................................................................11
6.2. Standards .........................................................................................11
6.3. Approvals .........................................................................................11
6.4. Type label .........................................................................................11
6.5. Labeling of the forged bodies .....................................................11
6.6. Operating conditions .....................................................................12
6.7. Flow values and characteristics ..................................................19
6.8. General technical data ..................................................................19
7. INSTALLATION ............................................................................................... 20
7.1. Safety instructions .........................................................................20
7.2. Before installation ...........................................................................20
7.3. Installation ........................................................................................22
7.4. Pneumatic connection ..................................................................23
7.5. Removal ............................................................................................24
8. ELECTRICAL CONTROL UNIT ............................................................... 25
9. MALFUNCTIONS ...........................................................................................25
10. MAINTENANCE, CLEANING ................................................................. 26
10.1. Safety instructions .......................................................................26
10.2. Maintenance work ........................................................................26
11. REPAIRS ......................................................................................................... 27
11.1. Safety instructions .......................................................................27
11.2. Replacing the diaphragm ...........................................................28
12. REPLACEMENT PARTS ..........................................................................30
12.1. Order table ....................................................................................30
13. PACKAGING, TRANSPORT, STORAGE .......................................... 31
3
english
Type 2730 / 2731 / 2731K
4
english
Type 2730 / 2731 / 2731K
1. OPERATING INSTRUCTIONS
The operating instructions describe the entire life cycle of the device.
Keep these instructions in a location which is easily accessible to
every user and make these instructions available to every new owner
of the device.
The operating instructions contain important safety information!
Failure to observe these instructions may result in hazardous
situations.
• The operating instructions must be read and understood.
1.1. Symbols
DANGER!
Warns of an immediate danger!
• Failure to observe the warning may result in a fatal or serious
injury.
WARNING!
Warns of a potentially dangerous situation!
• Failure to observe the warning may result in serious injuries or
death.
CAUTION!
Warns of a possible danger!
• Failure to observe this warning may result in a moderately
severe or minor injury.
NOTE!
Warns of damage to property!
• Failure to observe the warning may result in damage to the
device or the equipment.
Indicates important additional information, tips and
recommendations.
Refers to information in these operating instructions or in
other documentation.
→ Designates a procedure which you must carry out.
1.2. Definition of term “device”
The term “device” used in these instructions always stands for the
diaphragm control valve Type 2730 / 2731 / 2731K.
5
Operating instructions
english
Type 2730 / 2731 / 2731K
2. AUTHORIZED USE
Non-authorized use of the diaphragm control valve Type 2730
/ 2731 / 2731K may be a hazard to people, nearby equipment
and the environment.
• The device is designed for the controlled flow of liquid media.
• The admissible data, the operating conditions and conditions of
use specified in the contract documents, operating instructions
and on the label are to be observed during use. The designated
application cases are specified in the chapter entitled “5. Product description”.
• The device may be used only in conjunction with third-party
devices and components recommended and authorised by
Bürkert.
• Correct transportation, correct storage and installation and
careful use and maintenance are essential for reliable and faultless operation.
• Use the device only as intended.
2.1. Restrictions
If exporting the system/device, observe any existing restrictions.
3. BASIC SAFETY
INSTRUCTIONS
These safety instructions do not make allowance for any
• contingencies and events which may arise during the installation,
operation and maintenance of the devices.
• local safety regulations, whereby the operator is responsible for their
compliance, by the installation personnel too.
DANGER!
Danger – high pressure!
• Before dismounting the lines and valves, turn off the pressure
and vent the lines.
Risk of electric shock!
• Before reaching into the device, switch off the power supply
and secure to prevent reactivation!
• Observe applicable accident prevention and safety regulations
for electrical equipment!
WARNING!
Risk of injury when opening the actuator!
The actuator contains a tensioned spring. If the actuator is
opened, there is a risk of injury from the spring jumping out!
• The actuator must not be opened.
6
Authorized use
english
Type 2730 / 2731 / 2731K
CAUTION!
Risk of burns!
The surface of the device may become hot during long-term
operation.
• Do not touch the device with bare hands.
General hazardous situations.
To prevent injury, ensure that:
• The system cannot be activated unintentionally.
• Installation and repair work may be carried out by authorized
technicians only and with the appropriate tools.
• After an interruption in the power supply or pneumatic supply,
ensure that the process is restarted in a defined or controlled
manner.
• The device may be operated only when in perfect condition and
in consideration of the operating instructions.
• The general rules of technology apply to application planning
and operation of the device.
To prevent damage to property on the device, ensure:
• Supply the media connections only with those media which are
specified as flow media in the chapter entitled “6. Technical data”.
• Do not put any loads on the valve (e.g. by placing objects on it
or standing on it).
• Do not make any external modifications to the valves. Do not paint
the body parts or screws.
The diaphragm control valve Type 2730 / 2731 / 2731K was
developed with due consideration given to accepted safety
rules and is state-of-the-art. Nevertheless, dangerous situations may occur.
Failure to observe this operating manual and its operating instructions
as well as unauthorized tampering with the device release us from
any liability and also invalidate the warranty covering the devices
and accessories!
3.1. Instructions for use in
explosion protected area
(Ex area)
3.1.1. Safety instructions
For use in Ex area zone (gas) 1 and 2,
zone (dust) 21 and 22, applies:
DANGER!
Danger of explosion caused by electrostatic charge!
If there is a sudden discharge from electrostatically charged devices
or persons, there is a danger of explosion in the Ex area.
• Take appropriate measures to prevent electrostatic charges in the
Ex area.
• Clean the device surface by gently wiping it with a damp or
antistatic cloth.
7
Basic safety instructions
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Type 2730 / 2731 / 2731K
3.1.2. Media in the Ex area
If explosive media are used, this may create an additional
risk of explosion!
3.1.3. Control unit in the Ex area
The control unit may restrict use in an explosive atmosphere.
Follow operating instructions for control unit.
3.1.4. Cleaning in the Ex area
Test cleaning agent for approval in explosive atmosphere.
3.1.5. Adhesive label for Ex area
ACHTUNG: In Ex-Bereichen darf die Oberfläche
nur mit einem feuchten Tuch gereinigt werden
CAUTI
ON: In Hazardous Areas the surface
may only be cleaned with a wet towel
II 2G c T4 IP65/67
II 2D c T135°C
Warnung: Im Ex-Bereich Oberfläche
nur mit feuchtem Tuch reinigen
Warning: In Hazardous Areas the surface
may only be cleaned with a damp cloth
Nicht gültig für angebaute Geräte
Not valid for added devices
Fig. 1: Label Ex area
3.1.6. Temperature ranges in the Ex area
max. T
Environment
Medium (Seat seal PTFE)
≤ DN 25 > DN 25
T6 85 °C -10 - +45 °C -10 - +55 °C
T5 100 °C -10 - +60 °C -10 - +70 °C
T4 135 °C -10 - +95 °C -10 - +105 °C
Tab. 1: Temperature ranges Ex area
10 20 30 40 50 60 70 80 90 100 110 120 130
10
20
30
40
50
60
70
80
90
100
110
120
130
140
0
Medium temperature [°C]
Ambiente temperature [°C]
Temperature class T4
Temperature class T5
Temperature class T6
Valves ≤ DN 25
Valves > DN 25
Fig. 2: Temperature ranges Ex area
8
Basic safety instructions
english
Type 2730 / 2731 / 2731K
4. GENERAL INFORMATION
4.1. Contact address
Germany
Bürkert Fluid Control Systems
Sales Center
Chr.-Bürkert-Str. 13-17
D-74653 Ingelfingen
Tel. : 07940 - 10 91 111
Fax: 07940 - 10 91 448
E-mail: info@de.burkert.com
International
Contact addresses are found on the final pages of the printed operating manual.
You can also find information on the Internet under:
www.burkert.com
4.2. Warranty
The warranty is only valid if the device is used as authorized in accordance with the specified application conditions.
4.3. Information on the internet
The operating instructions and data sheets for Type 2730 / 2731 /
2731K can be found on the Internet at: www.burkert.com
5. PRODUCT DESCRIPTION
5.1. General description
The piston-controlled diaphragm control valve Type 2730 / 2731 /
2731K is suitable for liquid media.
Using neutral gases or air (control media), it controls the flow of dirty,
aggressive, ultrapure or sterile media, even highly viscous media can
be used (flow media).
Follow instructions for use in the Ex area!
See chapter “3.1”.
The operation of the diaphragm control valve Type 2730 / 2731 /
2731K is possible only in combination with an control unit. Possible
control units are:
Positioner Type 8630, 8635, 8692, 8694, 8792
Process controller Type 8693, 8793
5.2. Properties
• Any flow direction.
• Self-draining for appropriate installation. The ends of the utilized
connections must be cylindrical.
• Free of empty space.
• Low-turbulence flow.
• High flow values by the streamlined valve body.
• Maintenance-free under normal conditions.
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General information
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Type 2730 / 2731 / 2731K
5.2.1. Device versions
Actuator sizes
The piston-controlled diaphragm control valve is available for the
following actuator sizes:
ø 80 mm, ø 100 mm, ø 125 mm.
Pilot pressure
Designs with lower pilot pressure (reduced spring force) are
available on request.
Contact your Bürkert sales office or our Sales Center, e-mail:
info@de.buerkert.com
5.3. Structure and function
The operation of the diaphragm control valve Type 2730 / 2731
/ 2731K is possible only in combination with an control unit.
Possible control units are:
Positioner Type 8630, 8635, 8692, 8694, 8792
Process controller Type 8693, 8793
5.3.1. Structure
The piston-controlled diaphragm control valve consists of a pneumatically operated piston actuator and a 2/2-way valve body.
Actuator cover
Actuator body
Diaphragm socket
Line connection
Diaphragm body
Lower pilot air port
Upper pilot air port
Diaphragm
Fig. 3: Structure and description
5.3.2. Function / control functions (CF)
Spring force (CFA) or pneumatic pilot pressure (CFB) generates the
closing force on the diaphragm pressure piece. The force is transferred
via a spindle which is connected to the actuator piston.
Control function A (CFA)
Normally closed by spring action
Control function B (CFB)
Normally open by spring action
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Product description
english
Type 2730 / 2731 / 2731K
6. TECHNICAL DATA
WARNING!
Risk of injury from high pressure!
Important device-specific technical specifications are indicated on
the type label.
• Observe permitted pressure range on the type label of the device.
6.1. Conformity
In accordance with the EC Declaration of conformity, the diaphragm
control valve Type 2730 / 2731 / 2731K is compliant with the EC
Directives.
6.2. Standards
The applied standards, which verify conformity with the EC Directives,
can be found on the EC-Type Examination Certificate and / or the EC
Declaration of Conformity.
6.3. Approvals
The product is authorized for use in Zone 1 and 21 according to the
ATEX directive 94/9/EC of category 2 G/D.
Follow instructions for use in the Ex area!
See chapter “3.1”.
6.4. Type label
2731 A 25,0 EPDM VA
D29 Pmed 10 bar
Pilot 5,5-7 bar
00148320
Made in Germany
W14UN
Identification number
Control function
Sealing material
Type
Orifice (diaphragm size)
Date of manufacture
Line connection /
Permitted medium pressure
Body material
Permitted pilot pressure
Fig. 4: Type label (example)
6.5. Labeling of the forged bodies
XXXXXXXXXX
XX F
1.4435/316L(VS)
PN16/CWP150
XXXXXXXX/XXX
XXXXXX
XXXX
Surface quality code
Customer-specific text
(optional)
Orifice connection and
pipe dimension
Batch number
Material
Production number /
serial number
Nominal pressure
Fig. 5: Labeling of the forged bodies
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Technical data
english
Type 2730 / 2731 / 2731K
6.6. Operating conditions
6.6.1. Temperature ranges
WARNING!
Risk of injury, chemical burns, scalding due to the device
rupturing at excessively high pressure!
• Do not exceed the maximum pilot and medium pressure.
• Observe permitted ambient and medium temperature.
• Observe specifications on the type label.
Follow instructions for use in the Ex area!
See chapter “3.1”.
Permitted ambient temperature actuators
Actuator size Actuator material Environment
1)
ø 80 mm
PA, PPS -10 – +60 °Cø 100 mm
ø 125 mm
Tab. 2: Permitted ambient temperature actuators
1) If using a pilot valve / control unit, observe its
temperature range.
Permitted medium temperature for body
Plastic body: note that the permissible medium pressure is
dependent on the medium temperature (see “Fig. 6: Graph
of medium pressure / medium temperature”).
Body material Medium
PVDF (PD) -10 – +120 °C
PP (PP) -10 – +80 °C
PVC (PV) -10 – +60 °C
Stainless steel body
(VA)
1.4404 (AISI 316L)
-10 – +140 °C
Cast body (VG) 1.4435 (AISI 316L)
Forged body (VS)
1.4435 BN2 (AISI 316L)
according to ASME BPE
1997
Tab. 3: Permitted medium temperature for body
Permitted medium temperature for diaphragms
The indicated medium temperatures apply only to media
which do not corrode or swell the diaphragm materials.
The behavior of the medium with respect to the diaphragm
may be changed by the medium temperature.
The function properties, in particular the service life of the diaphragm, may deteriorate if the medium temperature increases.
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Technical data
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Type 2730 / 2731 / 2731K
Diaphragm Medium Remarks
EPDM -10 – +130 °C Steam sterilization: up to +150 °C
FKM 0 – +130 °C
• dry up to + 150 °C
• otherwise only briefly up
to +150 °C
PTFE -10 – +130 °C Steam sterilization: up to +150 °C
Tab. 4: Permitted medium temperature for diaphragms
6.6.2. Pressure ranges
WARNING!
Risk of injury, chemical burns, scalding due to the device
rupturing at excessively high pressure!
• Do not exceed the maximum pilot and medium pressure.
• Observe permitted ambient and medium temperature.
• Observe specifications on the type label.
Pilot pressure for valves with pneumatic position controller
To ensure reliable operation with pneumatic position controller,
observe the permitted minimum and maximum pilot pressure!
Actuator size [mm] Pilot pressure
ø 80, ø 100, ø 125 5.5 – 7.0 bar
Tab. 5: Pilot pressure for valves with pneumatic position controller
Maximum pilot pressure for valves without pneumatic position
controller
Actuator size [mm] Actuator material
max. permitted pilot
pressure
2)
ø 80, ø 100 PA 10 bar
ø 125 PA 7 bar
ø 80, ø 100, ø 125 PPS 7 bar
Tab. 6: Maximum pilot pressure for valves without pneumatic
position controller
Maximum pilot pressure for valves without pneumatic position
controller - only control function B and stainless steel body (VA)
Actuator size [mm] Actuator material
max. permitted pilot
pressure
2)
ø 80, ø 100, ø 125 PA, PPS 6 bar
Tab. 7: Maximum pilot pressure for valves without pneumatic
position controller - only CFB and stainless steel body (VA)
2) Observe the maximum pressure range according to the
type label!
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Technical data
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Type 2730 / 2731 / 2731K
Medium pressure for plastic body
Plastic body: note that the permissible medium pressure is
dependent on the medium temperature (see “Fig. 6”).
Medium temperature [°C]
Medium pressure [bar]
0
2
4
6
8
10
20 40 60 80 100 120 140
PP
P
V
C
P
V
DF
Fig. 6: Graph of medium pressure / medium temperature
Pilot pressure for control function A
3)
The values apply to
• Plastic body PVDF (PD), PP (PP), PVC (PV)
• Forged steel body (VS)
• Precision casting body (VG)
• Stainless steel body (VA) with ISO weld end connection
ISO clamp connection
Threaded connection
Welded neck flange
Actuator size
[mm]
Orifice DN
(Diaphragm size)
[mm]
Max. sealed medium pressure [bar]
Pressure on one
side
Pressure on both
sides
EPDM/FKM PTFE EPDM/FKM PTFE
ø 80
15 10 10 10 10
20 10 10 10 10
25 10 7,5 8,5 5,5
ø 100 32 10 8 9 6
ø 125
40 10 10 10 9
50 8 7 7 6
Tab. 8: Pilot pressure for control function A
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Technical data
english
Type 2730 / 2731 / 2731K
Operating pressure for control function A
3)
The values apply to
• Stainless steel body (VA) with DIN weld end connection
DIN clamp connection
Actuator size
[mm]
Orifice DN
(Diaphragm size)
[mm]
Max. sealed medium pressure [bar]
Pressure on one
side
Pressure on both
sides
EPDM/FKM PTFE EPDM/FKM PTFE
ø 80
15 10 10 10 10
20 10 10 10 10
25 10 10 10 9
32 10 8 7.5 6
ø 100 40 10 8 8 6
ø 125 50 10 10 10 8.5
Tab. 9: Operating pressure for control function A
3) The control functions are described in the chapter entitled “5.3.2.
Function / control functions (CF)”.
Operating pressure for control function A
3)
The values apply to
• Stainless steel body (VA) with OD weld end connection
BS clamp connection
Actuator size
[mm]
Orifice DN
(Diaphragm size)
[mm]
Max. sealed medium pressure [bar]
Pressure on one
side
Pressure on both
sides
EPDM/FKM PTFE EPDM/FKM PTFE
ø 80
20 10 10 10 10
25 10 10 10 9
ø 100 40 10 8 8 6
ø 125 50 10 10 10 8.5
Tab. 10: Operating pressure for control function A
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Technical data
english
Type 2730 / 2731 / 2731K
Required minimum pilot pressure depending on medium pressure
for control function B.
The values in the following graphs apply to:
• Plastic body PVDF (PD), PP (PP), PVC (PV)
• Forged steel body (VS)
• Precision casting body (VG)
• Stainless steel body (VA) with ISO- weld end connection
ISO clamp connection
Threaded connection
Welded neck flange
To protect the diaphragm during control function B, preferably
do not select the pilot pressure higher than is required to
switch the medium pressure.
Control function B / elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 80 EPDM
DN15
DN20
DN25
Fig. 7: Pressure graph, actuator ø 80 mm, control function B,
elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 100, ø 125 EPDM
DN32
DN40
DN50
Fig. 8: Pressure graph, actuator ø 100 mm and ø 125 mm,
control function B, elastomer diaphragm
Control function B / PTFE diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 80, ø 100, ø 125 PTFE
DN32
DN40
DN15
DN20
DN25
DN50
Fig. 9: Pressure graph, actuator ø 80 mm, ø 100 mm and
ø 125 mm, control function B, PTFE diaphragm
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Technical data
english
Type 2730 / 2731 / 2731K
The values in the following graphs apply to:
• Stainless steel body (VA) with DIN weld end connection
DIN clamp connection
To protect the diaphragm during control function B, preferably
do not select the pilot pressure higher than is required to
switch the medium pressure.
Control function B / elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 80 EPDM
DN15
DN20
DN25
DN32
Fig. 10: Pressure graph, actuator ø 80 mm, control function B,
elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 100, ø 125 EPDM
DN40
DN50
Fig. 11: Pressure graph, actuator ø 100 mm and ø 125 mm,
control function B, elastomer diaphragm
Control function B / PTFE diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 80, ø 100, ø 125 PTFE
DN40
DN50
DN15
DN20
DN25
DN32
Fig. 12: Pressure graph, actuator ø 80 mm, ø 100 mm and
ø 125 mm, control function B, PTFE diaphragm
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Technical data
english
Type 2730 / 2731 / 2731K
The values in the following graphs apply to:
• Stainless steel body (VA) with OD weld end connection
BS clamp connection
To protect the diaphragm during control function B, preferably
do not select the pilot pressure higher than is required to
switch the medium pressure.
Control function B / elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 80 EPDM
DN20
DN25
Fig. 13: Pressure graph, actuator ø 80 mm, control function B,
elastomer diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 100, ø 125 EPDM
DN40
DN50
Fig. 14: Pressure graph, actuator ø 100 mm and ø 125 mm,
control function B, elastomer diaphragm
Control function B / PTFE diaphragm
0
1
2
3
4
5
6
7
8
9
10
0 1 2 3 4 5 6 7 8
Pilot pressure [bar]
Medium pressure [bar]
ø 80, ø 100, ø 125 PTFE
DN40
DN50
DN20
DN25
Fig. 15: Pressure graph, actuator ø 80 mm, ø 100 mm und
ø 125 mm, control function B, PTFE diaphragm
18
Technical data
english
Type 2730 / 2731 / 2731K
6.7. Flow values and characteristics
Flow values and characteristics for Types 2730 / 2731 /
2731K you find on Internet.
6.8. General technical data
Actuator sizes ø 80 mm
ø 100 mm
ø 125 mm
Connections
Pilot air port G1/4, stainless steel
Line connection
Type 2730 Socket and spigot
Type 2731 / 2731K Weld end: in accordance with EN ISO
1127 (ISO 4200), DIN 11850 R2
other connections on request
Materials
Body
Type 2730 PVDF (PD), PP (PP), PVC (PV)
Type 2731 Stainless steel precision casting (VG)
1.4435 (AISI 316L),
Stainless steel forged steel (VS)
1.4435 (AISI 316L)
Type 2731K Stainless steel body (VA) cold-formed
1.4404 (316L)
Actuator PA, PPS
Sealing elements actuator FKM, NBR
Diaphragm EPDM in food quality,
PTFE/EPDM,
FKM
19
Technical data
english
Type 2730 / 2731 / 2731K
Media
Control medium Neutral gases, air
Quality classes in accordance with DIN ISO
8573-1
Dust content Class 5: max. particle size 40 μm, max. particle
density 10 mg/m³
Water content Class 3: max. pressure dew point - 20 °C or
min. 10 °C below the lowest operating
temperature
Oil content Class 5: max. 25 mg/m³ with TopControl
maxi 1 mg/m³ with SideControl
Flow media
Type 2730 Liquids; aggressive or abrasive media
Type 2731 / 2731K Liquids; ultrapure, sterile, aggressive
or abrasive media
Viscosity up to viscous
Installation position any position, preferably with the
actuator face up
Protection class IP67 in accordance with
IEC 529 / EN 60529
7. INSTALLATION
7.1. Safety instructions
DANGER!
Danger – high pressure in the equipment!
• Before loosening the lines and valves, turn off the pressure and
vent the lines.
WARNING!
Risk of injury from improper installation!
• Installation may be carried out by authorised technicians only
and with the appropriate tools!
Risk of injury from unintentional activation of the system and
an uncontrolled restart!
• Secure system from unintentional activation.
• Following assembly, ensure a controlled restart.
7.2. Before installation
• Before connecting the valve, ensure the pipelines are flush.
• The flow direction is optional.
7.2.1. Installation position
• The piston-controlled diaphragm control valve can be installed in
any installation position, preferably with the actuator face up.
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Installation
english
Type 2730 / 2731 / 2731K
Installation for self-drainage of the body
4)
To ensure self-drainage:
→ Install body inclined by an angle α = 15° – 35° to the horizontal.
→ Forged and cast body: Mark on the body must point upwards
(12 o’clock position, see “Fig. 16”).
→ Observe an inclination angle of 1° – 5° to the line axis.
Angle α: 15 °– 35°
Inclination to the line axis 1° – 5°
Mark
α
Fig. 16: Installation position for self-drainage of the body
7.2.2. Preparatory work
→ Clean pipelines (sealing material, swarf, etc.).
→ Support and align pipelines.
4) Please request installation for 3A certification explicitly.
Devices with VG/VS/VA welded body:
NOTE!
Damage to the diaphragm or the actuator!
• Before welding in the body, remove the actuator.
Remove the actuator from the valve body:
NOTICE!
Damage to the diaphragm or the seat contour!
• When removing the actuator, ensure that the valve is in open
position.
→ Control function A pressurize the lower pilot air port with com-
pressed air (5 bar): valve opens.
→ Remove actuator with diaphragm by loosening the body screws.
Actuator
Valve body
Lower pilot air port
Upper pilot air port
Body screws (4x)
Diaphragm
Fig. 17: Installation
21
Installation
english
Type 2730 / 2731 / 2731K
7.3. Installation
WARNING!
Risk of injury from improper installation!
Non-observance of the tightening torque is dangerous as the
device may be damaged.
• Observe the tightening torque (see “Tab. 11: Tightening torques
for diaphragms”).
7.3.1. Installation of the valve body
Welded bodies
→ Weld valve body in pipeline system.
Other body versions
→ Connect body to pipeline.
7.3.2. Installation of the actuator (welded
body)
Installation for actuator with control function A:
NOTICE!
Damage to the diaphragm or the seat contour!
• When installing the actuator, ensure that the valve is in open
position.
→ Control function A pressurize the lower pilot air port with com-
pressed air (5 bar): valve opens.
→ Lightly cross-tighten the body screws until the diaphragm is
between the body and actuator.
Do not tighten the screws yet.
→ Actuate the diaphragm control valve twice.
→ Without pressurization tighten the body screws to the permitted
tightening torque (see following table “Tab. 11: Tightening torques
for diaphragms”).
Installation for actuator with control functions B:
→ Lightly cross-tighten the body screws without pressurization until
the diaphragm is between the body and actuator.
Do not tighten the screws yet.
→ Pressurize upper pilot air port of the actuator with compressed
air (5 bar).
→ Actuate the diaphragm control valve twice.
→ With pressurization tighten the body screws to the permitted tight-
ening torque (see “Tab. 11: Tightening torques for diaphragms”).
Lower pilot air port
Upper pilot air port
Fig. 18: Pilot air port
22
Installation
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Type 2730 / 2731 / 2731K
Orifice DN
(diaphragm size)
Tightening torques for diaphragms [Nm]
EPDM PTFE
15 3.5 4
20 4 4.5
25
5 6
32
6 8
40
8 10
50 12 15
Tab. 11: Tightening torques for diaphragms
7.4. Pneumatic connection
DANGER!
Danger – high pressure in the equipment!
• Before loosening the lines and valves, turn off the pressure and
vent the lines.
WARNING!
Risk of injury from unsuitable connection hoses!
Hoses which cannot withstand the pressure and temperature
range may result in hazardous situations.
• Use only hoses which are authorised for the indicated pressure
and temperature range.
• Observe the data sheet specifications from the hose manufacturers.
The operation of the diaphragm control valve Type 2730 / 2731
/ 2731K is possible only in combination with an control unit.
Possible control units are:
Positioner Type 8630, 8635, 8692, 8694, 8792
Process controller Type 8693, 8793
Observe the type label!
The pneumatic connection of the control unit is described in
the respective operating instructions for the control unit.
23
Installation
english
Type 2730 / 2731 / 2731K
7.4.1. Connection of the actuator
Control functions A:
→ Connect the control medium to the lower pilot air port of the
actuator (see “Fig. 19: Pneumatic connection”)
Control functions B:
→ Connect the control medium to the upper pilot air port of the
actuator (see “Fig. 19: Pneumatic connection”)
Silencer
For reducing the exhaust air noise: plug the silencer into the free air
discharge connection (see “Fig. 19: Pneumatic connection”)
If used in an aggressive environment, we recommend
conveying all free pneumatic connections into a neutral
atmosphere with the aid of a pneumatic hose.
Lower pilot air port
Upper pilot air port
Fig. 19: Pneumatic connection
Control air hose:
Control air hoses of sizes 6/4 mm or 1/4“ can be used.
7.5. Removal
DANGER!
Risk of injury from discharge of medium and pressure!
It is dangerous to remove a device which is under pressure due to
the sudden release of pressure or discharge of medium.
• Before removing a device, switch off the pressure and vent the
lines.
Procedure:
→ Loosen the pneumatic connection.
→ Remove the device.
NOTE!
Deformation of the diaphragm!
• For prolonged storage of the valves, slacken the housing screws.
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Installation
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Type 2730 / 2731 / 2731K
8. ELECTRICAL CONTROL UNIT
The valve Type 2730 / 2731 / 2731K can be combined with following control units:
• Type 8630 Positioner TopControl Continuous
• Type 8635 Positioner SideControl
• Type 8692 Positioner TopControl
• Type 8694 Positioner TopControl Basic
• Type 8792 Positioner SideControl
• Type 8693 Process controller TopControl
• Type 8793 Process controller SideControl
Follow instructions for use in the Ex area!
See chapter “3.1”.
The electrical connection of the control unit is described in
the respective operating instructions for the control unit.
9. MALFUNCTIONS
Malfunction Cause /remedial action
Actuator does
not switch.
Pilot air port interchanged
5)
CFA: Connecting lower pilot air port
CFB: Connecting upper pilot air port
Pilot pressure too low
See pressure specifications on the type label.
Medium pressure too high
See pressure specifications on the type label.
Valve is not
sealed.
Medium pressure too high
See pressure specifications on the type label.
Pilot pressure too low
See pressure specifications on the type label.
Flow rate
reduced.
PTFE diaphragm bulging
→ Replace diaphragm.
Tab. 12: Malfunctions
5) see “Fig. 19: Pneumatic connection”
25
Electrical control unit
english
Type 2730 / 2731 / 2731K
10. MAINTENANCE, CLEANING
10.1. Safety instructions
DANGER!
Danger – high pressure in the equipment!
• Before loosening the lines and valves, turn off the pressure and
vent the lines.
Risk of injury due to electrical shock!
• Before reaching into the system, switch off the power supply
and secure to prevent reactivation!
• Observe applicable accident prevention and safety regulations
for electrical equipment!
WARNING!
Risk of injury from improper maintenance!
• Installation may be carried out by authorized technicians only
and with the appropriate tools!
Risk of injury from unintentional activation of the system and
an uncontrolled restart!
• Secure system from unintentional activation.
• Following maintenance, ensure a controlled restart.
10.2. Maintenance work
10.2.1. Actuator
The actuator of the diaphragm control valve is maintenance-free
provided it is used according to these operating instructions.
10.2.2. Wearing parts of the diaphragm
control valve
Parts which are subject to natural wear:
• Seals
• Diaphragm
→ If leaks occur, replace the particular wearing part with an appro-
priate spare part (see chapter “12. Replacement parts”).
A bulging PTFE diaphragm may reduce the flow.
The replacing of the wearing parts is described in chapter
“11. Repairs”.
10.2.3. Inspection intervals
→ Check diaphragm for wear after maximum 10
5
switching cycles.
Muddy and abrasive media require correspondingly shorter
inspection intervals!
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Maintenance, cleaning
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Type 2730 / 2731 / 2731K
10.2.4. Service life of the diaphragm
The service life of the diaphragm depends on the following factors:
• Diaphragm material
• Medium, Medium pressure, Medium temperature
• Actuator size
• Pilot pressure for CFB.
Protecting the diaphragm
→ For CFA match the actuator size (actuator force) to the medium
pressure to be actuated. If required, select the actuator with
reduced spring force EC04.
→ For CFB try and select the pilot pressure not higher than is
required to actuate the medium pressure.
10.2.5. Cleaning
Commercially available cleaning agents can be used to clean the
outside.
NOTE!
Avoid causing damage with cleaning agents.
• Before cleaning, check that the cleaning agents are compatible
with the body materials and seals.
Follow instructions for use in the Ex area!
See chapter “3.1”.
11. REPAIRS
11.1. Safety instructions
DANGER!
Danger – high pressure in the equipment!
• Before loosening the lines and valves, turn off the pressure and
vent the lines.
Risk of injury due to electrical shock!
• Before reaching into the system, switch off the power supply
and secure to prevent reactivation!
• Observe applicable accident prevention and safety regulations
for electrical equipment!
WARNING!
Risk of injury from improper maintenance!
• Installation may be carried out by authorised technicians only
and with the appropriate tools!
• Observe the tightening torques.
• On completion of the work check valve for leaks and function.
Risk of injury from unintentional activation of the system and
an uncontrolled restart!
• Secure system from unintentional activation.
• Following maintenance, ensure a controlled restart.
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Repairs
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Type 2730 / 2731 / 2731K
11.2. Replacing the diaphragm
Required spare part
• Diaphragm
Fastening types
Orifice DN
(diaphragm
size)
Fastening types for diaphragms
PTFE EPDM / FKM
15 Diaphragm buttoned
Diaphragm buttoned20
Diaphragm with bayonet
catch
25
32
Diaphragm with bayonet
catch
Diaphragm screwed in40
50
Tab. 13: Fastening types for diaphragms
DANGER!
Risk of injury from discharge of medium and pressure!
It is dangerous to remove a device which is under pressure due to
the sudden release of pressure or discharge of medium.
• Before removing a device, switch off the pressure and vent the
lines.
Replacement for control function A
→ Clamp the valve body in a holding device
(applies only to valves not yet installed).
NOTICE!
Damage to the diaphragm or the seat contour!
• When removing the actuator, ensure that the valve is in open
position.
→ Pressurize lower pilot air port of the actuator with compressed
air (5 bar): valve opens.
→ Loosen the four body screws.
→ Remove the actuator from the body.
→ Unbutton or unscrew old diaphragm. If attachment is with a
bayonet catch, remove the diaphragm by rotating it through 90°.
→ Install new diaphragm.
→ Align diaphragm.
The marker flap of the diaphragm must be perpendicular to
the direction of flow (see “Fig. 20”)!
→ Place actuator back on the body.
→ Insert the body screws and lightly cross-tighten until the dia-
phragm is between the body and actuator.
Do not tighten the screws yet.
→ Actuate the diaphragm control valve twice.
→ Without pressurization tighten the body screws to the per-
mitted tightening torque (see “Tab. 14: Tightening torques for
diaphragms”).
28
Repairs
english
Type 2730 / 2731 / 2731K
Actuator
Valve body
Lower pilot air port
Upper pilot air port
Body screws (4x)
Diaphragm
Marker flap of the
diaphragm
Fig. 20: Repairs
Replacement for control functions B
→ Clamp the valve body in a holding device.
(applies only to valves not yet installed).
→ Loosen the four body screws.
→ Remove the actuator from the body.
→ Unbutton or unscrew old diaphragm. If attachment is with a
bayonet catch, remove the diaphragm by rotating it through 90°.
→ Install new diaphragm.
→ Align diaphragm.
The marker flap of the diaphragm must be perpendicular to
the direction of flow (see “Fig. 20”)!
→ Place actuator back on the body.
→ Lightly cross-tighten the body screws without pressurization until
the diaphragm is between the body and actuator.
Do not tighten screws yet.
→ Pressurize upper pilot air port of the actuator with compressed
air (5 bar) (see “Fig. 20”).
→ Actuate the diaphragm control valve twice.
→ With pressurization tighten the body screws to the per-
mitted tightening torque (see “Tab. 14: Tightening torques for
diaphragms”).
Orifice DN
(diaphragm
size)
Tightening torques for diaphragms [Nm]
EPDM PTFE
15 3.5 4
20 4 4.5
25 5 6
32 6 8
40 8 10
50 12 15
Tab. 14: Tightening torques for diaphragms
29
Repairs
english
Type 2730 / 2731 / 2731K
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