EB 8310-6 EN
Translation of original instructions

Type 3271

Type 3277

Type 3271 and Type 3277 Pneumatic Actuators
Actuator area: 240 1), 350 and 700 1) cm²

Edition November 2022
1)

This document still applies to actuators with these actuator areas that are already in use.

Note on these mounting and operating instructions
These mounting and operating instructions assist you in mounting and operating the device
safely. The instructions are binding for handling SAMSON devices. The images shown inthese instructions are for illustration purposes only. The actual product may vary.
Î For the safe and proper use of these instructions, read them carefully and keep them forlater reference.
Î If you have any questions about these instructions, contact SAMSON‘s After-sales Service(aftersalesservice@samsongroup.com).

Documents relating to the device, such as the mounting and operating
instructions, are available on our website at www.samsongroup.com >Downloads > Documentation.

Definition of signal words! DANGER
Hazardous situations which, if not avoided,
will result in death or serious injury! WARNING
Hazardous situations which, if not avoided,
could result in death or serious injury! NOTICE
Property damage message or malfunction
Note
Additional information
Tip
Recommended action

EB 8310-6 EN

Contents

1
1.1
1.2
1.3
1.4

Safety instructions and measures.................................................................1-1
Notes on possible severe personal injury.......................................................1-3
Notes on possible personal injury.................................................................1-4
Notes on possible property damage..............................................................1-5
Warnings on the device................................................................................1-62
2.1

Markings on the device...............................................................................2-1
Actuator nameplate......................................................................................2-1

3
3.1
3.2
3.3
3.4
3.4.1
3.4.2
3.5
3.5.1
3.5.2
3.6
3.7
3.8

Design and principle of operation................................................................3-1
Type 3271...................................................................................................3-1
Type 3277...................................................................................................3-2
Direction of action........................................................................................3-2Signal pressure routing.................................................................................3-3
Type 3271...................................................................................................3-3
Type 3277...................................................................................................3-3
Fail-safe position..........................................................................................3-3
Actuator stem extends..................................................................................3-3
Actuator stem retracts...................................................................................3-3
Versions......................................................................................................3-4
Accessories.................................................................................................3-4
Technical data.............................................................................................3-5

4
4.1
4.2
4.3
4.3.1
4.3.2
4.4

Shipment and on-site transport....................................................................4-1
Accepting the delivered goods......................................................................4-1
Removing the packaging from the actuator....................................................4-1
Transporting and lifting the actuator..............................................................4-1
Transporting the actuator..............................................................................4-2
Lifting the actuator.......................................................................................4-2
Storing the actuator......................................................................................4-5

5
5.1
5.2
5.2.1
5.2.2

Installation..................................................................................................5-1
Preparation for installation............................................................................5-1
Mounting the device.....................................................................................5-1
Mounting the actuator onto the valve.............................................................5-2
Pneumatic connection...................................................................................5-6

6
6.1
6.1.1
6.1.2
6.1.3

Start-up......................................................................................................6-1
Spring compression......................................................................................6-2
Tensioning the springs..................................................................................6-2
Increasing the actuator thrust........................................................................6-3
Adapting the travel range.............................................................................6-4

EB 8310-6 EN

Contents

6.2
6.2.1
6.2.2
6.3
6.3.1
6.3.2

Travel stop...................................................................................................6-4
Bottom travel stop (minimum travel)...............................................................6-4
Top travel stop (maximum travel)...................................................................6-4
Version with handwheel................................................................................6-5
Extending the actuator stem manually............................................................6-6
Retracting the actuator stem manually............................................................6-6

7
7.1
7.2
7.3
7.4

Operation...................................................................................................7-1
Throttling service..........................................................................................7-1
On/off service.............................................................................................7-1
Manual mode (versions with handwheel only)................................................7-2
Additional notes concerning operation..........................................................7-2

8
8.1
8.2

Malfunctions...............................................................................................8-1
Troubleshooting...........................................................................................8-1
Emergency action........................................................................................8-2

9
9.1
9.2
9.3
9.4
9.4.1
9.4.2
9.5
9.5.1
9.6

Servicing and conversion.............................................................................9-1
Periodic testing............................................................................................9-2
Preparation for servicing or conversion work..................................................9-2
Mounting the actuator on the valve after service or conversion work................9-3
Service work...............................................................................................9-3
Replacing the diaphragm.............................................................................9-3
Replacing the actuator stem seals..................................................................9-7
Conversion work..........................................................................................9-9
Reversing the direction of action....................................................................9-9
Ordering spare parts and operating supplies...............................................9-12

10Decommissioning......................................................................................10-1

11
11.1
11.2

Removal...................................................................................................11-1
Removing the actuator from the valve..........................................................11-2
Relieving the spring compression in the actuator...........................................11-2

12
12.1

Repairs.....................................................................................................12-1
Returning devices to SAMSON...................................................................12-1

13

Disposal....................................................................................................13-1

14

Certificates................................................................................................14-1

15
15.1
15.2
15.3
15.4

Annex......................................................................................................15-1
Tightening torques, lubricants and tools.......................................................15-1
Spare parts...............................................................................................15-1
After-sales service......................................................................................15-4
Information on the UK sales region..............................................................15-4
EB 8310-6 EN

Safety instructions and measures

1 Safety instructions and measures
Intended use
The SAMSON Type 3271 and Type 3277 Actuators are designed for operating a mounted
globe valve. In combination with the valve, the actuators are used to shut off the flow of liquids, gases or vapors in the pipeline. Depending on the version, the actuators are suitable
for throttling or on/off service. The actuators can be used in processing and industrial plants.
The actuators are designed to operate under exactly defined conditions (e.g. thrust, travel).
Therefore, operators must ensure that the actuators are only used in operating conditions thatmeet the specifications used for sizing the actuators at the ordering stage. In case operators
intend to use the actuators in applications or conditions other than those specified, contact
SAMSON.
SAMSON does not assume any liability for damage resulting from the failure to use the device for its intended purpose or for damage caused by external forces or any other external
factors.
Î Refer to the technical data and nameplate for limits and fields of application as well as
possible uses.
Reasonably foreseeable misuse
The actuator is not suitable for the following applications:− Use outside the limits defined during sizing and by the technical data
− Use outside the limits defined by the accessories connected to the actuator
Furthermore, the following activities do not comply with the intended use:
− Use of non-original spare parts− Performing service and repair work not described
Qualifications of operating personnel
The actuator must be mounted, started up, serviced and repaired by fully trained and qualified personnel only; the accepted industry codes and practices must be observed. According
to these mounting and operating instructions, trained personnel refers to individuals who areable to judge the work they are assigned to and recognize possible hazards due to their specialized training, their knowledge and experience as well as their knowledge of the applicable standards.

EB 8310-6 EN

1-1

Safety instructions and measures

Personal protective equipment
We recommend wearing the following personal protective equipment when handling theType 3271 and Type 3277 Pneumatic Actuators:− Protective gloves and safety footwear when mounting or removing the actuator− Eye protection and hearing protection while the actuator is operating.
Î Check with the plant operator for details on further protective equipment.
Revisions and other modifications
Revisions, conversions or other modifications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example. Furthermore, the product may no longer meet the requirements for its intended use.
Safety devices
The Type 3271 and Type 3277 Actuators do not have any special safety equipment.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the actuator by the signal pressure, stored springenergy or moving parts by taking appropriate precautions. Plant operators and operating
personnel must observe all hazard statements, warnings and caution notes in these mounting
and operating instructions.
Responsibilities of the operator
Operators are responsible for proper use and compliance with the safety regulations. Operators are obliged to provide these mounting and operating instructions as well as the referenced documents to the operating personnel and to instruct them in proper operation. Furthermore, operators must ensure that operating personnel or third parties are not exposed toany danger.
Responsibilities of operating personnel
Operating personnel must read and understand these mounting and operating instructions aswell as the referenced documents and observe the specified hazard statements, warnings
and caution notes. Furthermore, operating personnel must be familiar with the applicablehealth, safety and accident prevention regulations and comply with them.

1-2

EB 8310-6 EN

Safety instructions and measures

Referenced standards, directives and regulations
According to the ignition hazard assessment performed in accordance with Clause 5.2 of
ISO 80079-36, the non-electrical actuators do not have their own potential ignition source
even in the rare incident of an operating fault. As a result, they do not fall within the scope of
Directive 2014/34/EU.
Î For connection to the equipotential bonding system, observe the requirements specified in
Clause 6.4 of EN 60079-14 (VDE 0165-1).
The Type 3271 and Type 3277 Actuators are partly completed machinery as defined in the
Machinery Directive 2006/42/EC and Directive 2008 No. 1597 Supply of Machinery(Safety) Regulations 2008.
Referenced documents
The following documents apply in addition to these mounting and operating instructions:− Mounting and operating instructions for the valve on which it is mounted− Mounting and operating instructions for mounted valve accessories (positioner, solenoid
valve etc.)− Safety Manual u SH 8310 for use in safety-instrumented systems− u AB 0100 for tools, tightening torques and lubricant

1.1 Notes on possible severe personal injury! DANGER
Risk of bursting in the actuator.
Actuators are pressurized. Improper opening can lead to actuator components bursting.
Î Before starting any work on the actuator, depressurize all plant sections affected
and the actuator.

EB 8310-6 EN

1-3

Safety instructions and measures

1.2 Notes on possible personal injury! WARNING
Crush hazard arising from moving parts.
The actuator contains moving parts (actuator stem), which can injure hands or fingers if
inserted into the actuator.
Î Do not touch the actuator stem or insert hands or finger into the yoke or beneath theactuator stem while the air supply is connected to the actuator.
Î While working on the actuator, disconnect and lock the pneumatic air supply as wellas the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into the yoke.
Î Before unblocking the actuator stem after it has become blocked (e.g. due to seizing
up after remaining in the same position for a long time), release any stored energy
in the actuator (e.g. spring compression). See section 'Relieving the spring compression in the actuator' in the 'Removal' chapter.
Risk of personal injury when the actuator vents.
The actuator is operated with air. As a result, air is vented during operation.
Î Install the control valve in such a way that vent openings are not located at eye level
and the actuator does not vent at eye level in the work position 1).
Î Use suitable mufflers and vent plugs.
Î Wear eye and hearing protection when working near the actuator.
Risk of personal injury due to preloaded springs.
Actuators with preloaded springs are under tension. These actuators can be identified
by several longer bolts with nuts protruding from the bottom diaphragm case. Thesebolts allow the spring compression to be relieved evenly on disassembling the actuator.
Actuators with considerably preloaded springs are also labeled correspondingly (seethe 'Markings on the device' chapter).
Î Before starting any work on the actuator, relieve the compression from the preloaded springs. See section 'Relieving the spring compression in the actuator' in the 'Removal' chapter.
1)

1-4

If not described otherwise in the valve documentation, the work position for the control valve is thefront view looking onto the operating controls (including valve accessories).

EB 8310-6 EN

Safety instructions and measures! WARNING
Damage to health relating to the REACH regulation.
If a SAMSON device contains a substance listed as a substance of very high concern on
the candidate list of the REACH regulation, this is indicated on the SAMSON deliverynote.
Î Information on safe use of the part affected
u www.samsongroup.com > About SAMSON > Material Compliance > REACH.
Risk of personal injury due to incorrect operation, use or installation as a result of information on the actuator being illegible.
Over time, markings, labels and nameplates on the actuator may become covered withdirt or become illegible in some other way. As a result, hazards may go unnoticed andthe necessary instructions not followed. There is a risk of personal injury.
Î Keep all relevant markings and inscriptions on the device in a constantly legible
state.
Î Immediately renew damaged, missing or incorrect nameplates or labels.

1.3 Notes on possible property damage! NOTICE
Risk of actuator damage due to incorrectly attached slings.
Î Do not attach load-bearing slings to the handwheel or travel stop.
Risk of actuator damage due to excessively high or low tightening torques.
Observe the specified torques when tightening actuator components. Excessive tightening torques lead to parts wearing out more quickly. Parts that are not tightened far
enough may loosen.
Î Observe the specified tightening torques (u AB 0100).
Risk of actuator damage due to the use of unsuitable tools.
Certain tools are required to work on the actuator.
Î Only use tools approved by SAMSON (u AB 0100).

EB 8310-6 EN

1-5

Safety instructions and measures! NOTICE
Risk of actuator damage due to the use of unsuitable lubricants.
The lubricants to be used depend on the actuator material. Unsuitable lubricants may
corrode and damage surfaces.
Î Only use lubricants approved by SAMSON (u AB 0100).

1.4 Warnings on the device
Warning symbols

Meaning of the warning

Location on the device

Warning against the incorrect use of the liftingeyelet/eyebolt or swivel hoist on SAMSON
actuators.
Only attach load-bearing slings to them tovertically lift the actuator on its own (without thevalve).
Do not use the lifting eyelet/eyebolt and the swivel
hoist to vertically lift the entire control valve
assembly.
Warning to indicate that the springs in theactuator are preloaded.
Actuators with preloaded springs are under
tension. Incorrect opening of the actuator can leadto personal injury due to the sudden anduncontrolled projection of parts.
Before starting any work on the actuator, relieve
the compression from the preloaded springs. See
section 'Relieving the spring compression in theactuator' in the 'Removal' chapter.

1-6

EB 8310-6 EN

Markings on the device

2.1 Actuator nameplate

The nameplate shown was up to date at thetime of publication of this document. The
nameplate on the device may differ from theone shown.

The nameplate is stuck to the diaphragm
casing. It includes all details required to
identify the device.

Made in
12
13

2 Markings on the device

16

2

25

30
31

40

3
4

S/N:
Mat.

15

28
18
19

20

6

5

cm²

9
10
26

22
23
24

Fig. 2-1: Inscriptions on the nameplate of the Type 3271 or Type 3277 Actuator with 240 1), 350 or
700 1) cm² actuator area
Item Inscription meaning

Item Inscription meaning

2 Type designation

22 Operating range in bar

3 Company name23 Operating range in psi

4 Company address (ZIP/postal code and city)

24 Permissible operating pressure pmax
in bar and/or psi

5 Data Matrix code
6 Device designation
9 Serial number
10 Material no.
12 Country of origin

25 Diaphragm material
26 Type of connecting thread
28 Symbol for manual override:(optional)

13 Month and year of manufacture

30 Version (optional), e.g. SAM001

15 Symbol indicating fail-safe action:

31 Version (optional), e.g. HW xx.xx.xx

Actuator stem extends (FA)Actuator stem retracts (FE)
16 Actuator area in cm²
18 Bench range in bar
19 Bench range in psi
20 Actuator travel in mm
1)

Only applies to devices already in use

EB 8310-6 EN

2-1

2-1

EB 8310-6 EN

Design and principle of operation

3 Design and principle of operation
The SAMSON Type 3271 and Type 3277
Actuators with 240 1), 350 and 700 1) cm²
actuator areas are mounted to Series 240,
250, 280 and 290 Valves (globe valves).

1)

3.1 Type 3271
The actuator mainly consists of two diaphragm cases (A1, A2), the diaphragm (A4)with diaphragm plate (A5) and springs(A10) (see Fig. 3-1).
The signal pressure pst creates the force F =pst · A at the diaphragm surface A which is
opposed by the springs (A10) in the actuator. The bench range is determined by the
number of springs used and their compres-Only applies to devices already in use

Actuator stem retracts

S

Actuator stem extends

A16

A5
A1

A4

A2

A10
S
A8
A7

A26/27
A1
A2
A4

Top diaphragm case
Bottom diaphragm
caseDiaphragm

A5
A7
A8
A10

Diaphragm plate
Actuator stem
Ring nut
Spring

A16
Vent plug
A26/27 Stem connector
clamp
S
Signal pressureconnection

Fig. 3-1: Type 3271 Pneumatic Actuator

EB 8310-6 EN

3-1

Design and principle of operation

sion, taking into account the rated travel. The
travel is proportional to the signal pressure
pst. The direction of action of the actuator
stem (A7) depends on how the springs are
installed in the actuator.
Several springs may be fitted into one another.
The stem connector clamps (A26/27)
connect the actuator stem (A7) with the plug
stem of the globe valve.

3.2 Type 3277
The principle of operation is the same as thatof the Type 3271 Actuator. The Type 3277
Actuator is fitted with an additional yoke on
the bottom diaphragm case (A2) (seeFig. 3-2). The yoke allows the direct attachment of a positioner and/or limit switch. The

A1

Top diaphragm
case

A2

Bottom diaphragm
case

A4

Diaphragm

A5

Diaphragm plate

A7

Actuator stem

A8

Ring nut

A10

Spring

A16

Vent plug

A26/27

Stem connector
clamp

S

Signal pressureconnection

benefit of this design is that the travel pickoff located inside the yoke is protectedagainst external influences.
Refer to the mounting and operating instructions of the valve accessories to be mounted
for more details on their attachment and theaccessories required.

3.3 Direction of action
The direction of action is determined by how
the springs (A10) and diaphragm plate (A5)
are arranged in the actuator.
With fail-safe action "actuator stem extends", the compressed air is applied to thesignal pressure connection on the bottom diaphragm case.
With fail-safe action "actuator stem retracts",
the compressed air is applied to the signal

Actuator stem retracts
S
A5

A4
A10

Actuator stem extends

A16
A1

A2
S
A7
A8
A26/27

Fig. 3-2: Type 3277 Pneumatic Actuator

3-2

EB 8310-6 EN

Design and principle of operationpressure connection on the top diaphragmcase.
The direction of action can be reversed (seethe 'Service and conversion work' chapter).

ed through the top signal pressure connection (S) to the top diaphragm chamber andmoves the actuator stem (A7) downward opposing the spring force (see Fig. 3-2, left).

3.4 Signal pressure routing

3.5 Fail-safe position

3.4.1

Note
The listed fail-safe actions apply to SAMSON Series 240, 250, 280 and 290 Valves(globe valves).

Type 3271

In the "actuator stem extends" version, thesignal pressure is routed through the bottom
signal pressure connection (S) to the bottom
diaphragm chamber and moves the actuator
stem (A7) upward opposing the spring force(see Fig. 3-1, right).
In the "actuator stem retracts" version, thesignal pressure is routed through the top signal pressure connection (S) to the top diaphragm chamber and moves the actuator
stem (A7) downward opposing the springforce (see Fig. 3-1, left).

3.4.2

Type 3277

In the "actuator stem extends" version (seeFig. 3-2, right), a signal pressure connection(S) is located on the side of the yoke which isconnected to the bottom diaphragm chamber over an internal hole. The signal pressure moves the actuator stem upward opposing the spring force. A positioner can beconnected using a connection block at thispoint. No additional piping to the actuator isrequired. Refer to the associated positioner
documentation for more details.
In the "actuator stem retracts" version, similar to Type 3271, the signal pressure is rout-

EB 8310-6 EN

When the signal pressure is reduced or thecontrol signal fails, the fail-safe position of
the control valve in throttling or on/off service depends on whether the springs are installed in the top or bottom diaphragmchamber.
Version with handwheel: in the active manual mode (the handwheel is not in the neutral position), the valve is not moved to thefail-safe position even upon failure of the
supply air.

3.5.1

Actuator stem extends

When the signal pressure is reduced or thecontrol signal fails, the springs move the actuator stem downward and close the globe
valve. The valve opens when the signal pressure is increased enough to overcome thespring force.

3.5.2

Actuator stem retracts

When the signal pressure is reduced or thecontrol signal fails, the springs move the ac-

3-3Design and principle of operation

tuator stem upward and open a mounted
globe valve. The valve closes when the signal
pressure is increased enough to overcome
the spring force.

3.6 Versions
The Type 3271 and Type 3277 Pneumatic
Actuators with 240 1), 350 or 700 1) cm² actuator area are available in the following
versions:− Standard version
The top and bottom diaphragm cases are
made of painted sheet steel.

3.7 Accessories
Swivel hoist
The pneumatic actuators with 700 1) cm² actuator area have a female thread on the top
diaphragm case to allow an eyebolt or swivel hoist to be screwed into it. The eyebolt canbe used to vertically lift the actuator and isincluded in the scope of delivery. The swivel
hoist is designed for setting a control valve
assembly upright or for lifting the actuator
without valve. The swivel hoist can be ordered (accessories).
Item no.

− Corrosion-resistant version
The top and bottom diaphragm cases are
made of stainless sheet steel (1.4301).
− Additional (top-mounted) handwheel
The actuators can be fitted with an additional (top-mounted) handwheel(u T 8312).
− Travel stop
The actuators as a special version can be
fitted with a mechanically adjustable
travel stop. The travel is reduced by up to
50 % in both directions of action (stemextends or retracts).
− Side-mounted handwheel
The actuators can be combined with aType 3273 Side-mounted Handwheelwith max. 30 mm travel (u T 8312).

Eyebolt(DIN 580)

Swivel hoist

700 1) cm²

8325-0131

8442-1017

Lifting fixture for small actuators
A special lifting tool is available to lift pneumatic actuators with 240 1) and 350 cm² actuator areas (u AB 0100).
Vent plugs
Vent plugs are screwed into the exhaust air
ports of pneumatic and electropneumatic devices. They ensure that any exhaust air that
forms can be vented to the atmosphere (toavoid excess pressure in the device). Furthermore, the vent plugs allow air intake to prevent a vacuum from forming in the device.
u AB 071)

3-4

Actuator area

Only applies to devices already in use

EB 8310-6 EN

Design and principle of operation

Feedback connection (travel pick-off interface) according to IEC 60534-6-1
Various valve accessories according toIEC 60534-6-1 and NAMUR recommendation can be mounted on SAMSON control
valves designed according to the modular
principle. See associated valve documentation. The travel pick-off interface for thesemounted devices can be ordered (accessories):
Type ...
Actuator

Actuatorarea incm²

Item/material number(accessories) for
Attachment
on one side

Attachment
on both sides

1400-6816(included inscope ofdelivery of
the actuator)

100029690

100029695(included inscope ofdelivery of
the actuator)

1400-5529

350 100029695

1400-5529

240 1)
3271
350
700 1)
240 1)
3277

Temperature range
The permissible temperature range depends
on the actuator service and diaphragm material:
Diaphragm material

Temperature range

Throttling service
NBR–35 to +90 °C–31 to +194 °F

EPDM–50 to +120 °C–58 to +248 °F
On/off service

NBR–20 to +90 °C–4 to +194 °F

EPDM–40 to +120 °C–40 to +248 °F

Supply pressure
The maximum permissible supply pressure is
specified in the order confirmation for thecontrol valve. However, the supply pressuremust not exceed 6 bar in throttling service.
See the 'Operation' chapter for restrictions
in on/off service.

700 1)

3.8 Technical data
The nameplate provides information on theactuator version (see the 'Markings on thedevice' chapter).
NoteMore information is available in Data Sheetu T 8310‑1.
1)

Only applies to devices already in use

EB 8310-6 EN

3-5

Design and principle of operation

Dimensions in mm and weights in kg
Actuator
Type
Actuator
cm²
area
H 1)
H'
Ha
Only withhandwheel
H1
With handwheel
and travel stop
Only withhandwheel
HeightH2max
With handwheel
and travel stop
H4ratedFA
H4maxFA
H4maxFE
H5
H6
H7 2)
Travel
H8
stop
Yoke
L
width
ØD
Diameter ØD1
ØD2
Ød (thread)Air connectionaa2
Weight 3)
Without handwheel
With handwheel

1)
2)
3)
4)

3-6

3271

3277

350

700

4)

240

350

700 4)

–
62
15

–
82
15

134
134
15

–
65
15

–
82
15

135
135
15

300

320

490

400

420

590

400

420

590

500

520

690

345

365

540

445

465

640

445

465

640

545

565

740

75
78
78
–
34
–

75
78
85
–
34
–

90
95
104
–
34
65

75
78
78
101
34
–

75
78
85
101
34
–

90
95
104
101
34
65

75

85

115

75

85

115

–

–

–

70

70

70

240
180
10

280
250
16

280
250
16

390
315
16

G¼
(¼ NPT)–

G 3/8(3/8 NPT)–

G 3/8(3/8 NPT)
G 3/8

G 3/8
(3/8 NPT)
G 3/8

5
9

8
13

12
17

26
31

240

4)

4)

390
240
315
180
16
16
M30x1.5
G 3/8
G¼(3/8 NPT) (¼ NPT)
–
G 3/8
22
27

9
13

In versions in which the lifting eyelet is welded directly onto the housing, H' and H are identical. The
value H' applies.
Height of eyebolt according to DIN 580. Height of the swivel hoist may differ.
The weights specified apply to a specific standard device configuration. Weights of other actuatorconfigurations may differ depending on the version (material, number of actuator springs etc.).
Only applies to devices already in use

EB 8310-6 EN

Design and principle of operation

Dimensional drawings

ØD

a2

ØD2
Ød

ØD2
Ød

Standard version of Type 3277 (240 1), 350 cm²)

a
H6

a

H4

H'

H8

Standard version of Type 3271 (700 1) cm²)

Ha

a

H4
H6

H4
H6

H5

H'

H

H'

H7

a

Ha

a

Ha

ØD

ØD2
Ød
L
Type 3277 (side view)
1)ØDType 3271 with travel stop

Only applies to devices already in use

EB 8310-6 EN

3-7

Design and principle of operation

ØD1

H1
H2

55

H6

a2

H4

H5

H'

Ha

a

ØD

ØD2
Ød

Type 3277 with handwheel

3-8

EB 8310-6 EN

Shipment and on-site transport

4 Shipment and on-site transport
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.

4.1 Accepting the delivered
goods
After receiving the shipment, proceed as follows:
1. Check the scope of delivery. Check thatthe specifications on the actuator nameplate match the specifications in the delivery note. See the 'Markings on the device' chapter for nameplate details.
2. Check the shipment for transportation
damage. Report any damage to SAMSON and the forwarding agent (refer todelivery note).
3. Determine the weight and dimensions of
the units to be lifted and transported inorder to select the appropriate lifting
equipment and lifting accessories. Referto the transport documents and the 'Technical data' chapter.

4.2 Removing the packaging
from the actuator
Observe the following sequence:Î Do not open or remove the packaging
until immediately before mounting theactuator.

Î Leave the actuator in its transport container or on the pallet to transport it onsite.
Î Dispose and recycle the packaging inaccordance with the local regulations.

4.3 Transporting and lifting theactuator! DANGER
Danger due to suspended loads falling.
Î Stay clear of suspended or moving
loads.
Î Close off and secure the transport paths.
! WARNING
Risk of lifting equipment tipping over andrisk of damage to lifting accessories due toexceeding the rated lifting capacity.
Î Only use approved lifting equipment andaccessories whose minimum lifting capacity is higher than the weight of theactuator (including any packaging).
! NOTICE
Risk of actuator damage due to incorrectly
attached slings.
700 1) cm² actuator: the lifting eyelet/eyebolt
or swivel hoist on the top diaphragm case is
only intended for mounting and removing
the actuator as well as lifting the actuator
without the valve. Do not use the lifting eyelet/eyebolt and the swivel hoist to verticallylift the entire control valve assembly.
1)

EB 8310-6 EN

Only applies to devices already in use

4-1

Shipment and on-site transportÎ Do not attach load-bearing slings to thehandwheel or travel stop.
Î Observe lifting instructions (see Chapter 4.3.2).
Tip
Our after-sales service can provide more detailed transport and lifting instructions on request.

4.3.1

Transporting the actuator

The actuator can be transported using lifting
equipment (e.g. crane or forklift).
Î Leave the actuator in its transport container or on the pallet to transport it.
Î Observe the transport instructions.
Transport instructions− Protect the actuator against external influences (e.g. impact).

4.3.2

Lifting the actuatorTo mount large actuators onto the valve, use
lifting equipment (e.g. crane or forklift) to lift
it. See section 'Accessories' in the 'Design
and principle of operation' chapter for fixture for lifting.
Lifting instructions− Use a hook with safety latch (seeFig. 4-5) to secure the slings from slipping off the hook during lifting andtransporting.
− Secure slings on the object to be transported against slipping.
− Make sure the slings can be removed
from the actuator once it has been
mounted on the valve.
− Prevent the actuator from tilting or tipping.
− Do not leave loads suspended when interrupting work for longer periods oftime.

− Do not damage the corrosion protection(paint, surface coatings). Repair any
damage immediately.

a) Lifting the actuator (without
valve)− Protect the actuator against moisture anddirt.

1. 700 1) cm² actuator: open the eyebolt
cover by lightly pressing the side clips(see Fig. 4-3 and Fig. 4-4).

− Observe permissible temperatures (seesection 'Technical data' in the 'Design
and principle of operation' chapter).

2. 700 1) cm² actuator: attach a sling to thelifting eyelet/eyebolt or swivel hoist of
the actuator and to the rigging equipment (e.g. hook) of the crane or forklift(see Fig. 4-5).
1)

4-2

Only applies to devices already in use

EB 8310-6 EN

Shipment and on-site transport

3. Carefully lift the actuator. Check whether
the lifting equipment and accessories canbear the weight.
4. Move the actuator at an even pace to themounting site.
5. Mount the actuator onto the valve (seethe 'Installation' chapter).
6. Remove slings after mounting.
700 1) cm² actuator: replace the cover on
the eyebolt (see Fig. 4-4 and Fig. 4-3).

b) Lifting the entire control valve
assembly
A swivel hoist can be screwed into versions
with a female thread on the top diaphragmcase of the actuator in place of the eyebolt(see section 'Accessories' in the 'Design andprinciple of operation' chapter). In contrast
to the eyebolt, the swivel hoist may be used
for setting a control valve assembly upright.
In order to lift an entire control valve assembly, the slings attached to the valve bodymust bear the entire load. The sling between
the lashing point on the actuator and rigging
equipment (hook, shackle etc.) must not bear
any load. The sling only protects the control
valve from tilting while being lifted. Before
lifting the control valve, tighten the sling.
Î See associated valve documentation for
instructions on how to lift a control valve.

1)

Only applies to devices already in use

EB 8310-6 EN

4-3

Shipment and on-site transport

Fig. 4-1: Ring bolt

Fig. 4-3: Eyebolt cover in place on the eyebolt

Fig. 4-2: Swivel hoist

Fig. 4-4: Eyebolt cover (with strap)
openedFig. 4-5: Lifting point on the actuator

Fig. 4-6: Lifting points on the control valve (example)

4-4

EB 8310-6 EN

Shipment and on-site transport

4.4 Storing the actuator− Make sure that the ambient air is free ofacids or other corrosive media.

! NOTICE− Observe permissible temperatures (seesection 'Technical data' in the 'Design
and principle of operation' chapter).

Risk of actuator damage due to improper
storage.
Î Observe the storage instructions.
Î Avoid long storage times.
Î Contact SAMSON in case of different
storage conditions or longer storage
times.

− Do not place any objects on the actuator.
Special storage instructions for elastomers
Elastomer, e.g. actuator diaphragm− To keep elastomers in shape and to prevent cracking, do not bend them or hangthem up.

Note
We recommend to regularly check the actuator and the prevailing storage conditions
during long storage times.

− We recommend a storage temperature of
15 °C for elastomers.

Storage instructions

Tip
Our after-sales service can provide more detailed storage instructions on request.

− When the valve and actuator are already assembled, observe the storage
conditions for control valves. See associ-− Store elastomers away from lubricants,
chemicals, solutions and fuels.

ated valve documentation.
− Protect the actuator against external influences (e.g. impact).
− Secure the actuator in the stored position
against slipping or tipping over.
− Do not damage the corrosion protection(paint, surface coatings). Repair any
damage immediately.
− Protect the actuator against moisture anddirt. Store it at a relative humidity of lessthan 75 %. In damp spaces, prevent condensation. If necessary, use a drying
agent or heating.

EB 8310-6 EN

4-5

4-6

EB 8310-6 EN

Installation

5 Installation
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.

5.1 Preparation for installation
Before installation, make sure the following
conditions are met:
− The actuator is not damaged.
− The type designation, material and temperature range of the actuator match theambient conditions (temperatures etc.).
See the 'Markings on the device' chapter
for nameplate details.
Proceed as follows:Î Lay out the necessary material and tools
to have them ready during mounting.
Î Check that the vent plugs to be used are
not blocked.
Î Check any pressure gauges mounted on
valve accessories to make sure they function properly.
Î When the valve and actuator are already assembled, check the tightening
torques of the bolted joints (u AB 0100).
Components may loosen during transport.

5.2 Mounting the device
Depending on the version, SAMSON control
valves are either delivered with the actuator
already mounted on the valve or the valve
and actuator are delivered separately. Whendelivered separately, the valve and actuator

EB 8310-6 EN

must be assembled together on site. Proceed
as follows to mount the actuator and before
start-up.
! WARNING
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,air is vented during operation.
Î During mounting make sure that ventopenings are not located at eye level inthe work position of the control valve andthe actuator does not vent at eye level inthe work position.
Î Wear eye and hearing protection whenworking near the actuator.
! WARNING
Crush hazard arising from the moving actuator stem.
Î Do not touch the actuator stem or insert
hands or finger into the yoke while theair supply is connected to the actuator.
Î Before working on the actuator, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into theyoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due to seizing up after remaining in the same position for a long time), release any stored
energy in the actuator (e.g. spring compression). See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.

5-1

Installation! NOTICE
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques when tightening actuator components. Excessive tightening torques lead to parts wearing out more
quickly. Parts that are not tightened far
enough may loosen.
Î Observe the specified tightening torques(u AB 0100).
! NOTICE
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON(u AB 0100).

5.2.1

Mounting the actuator
onto the valve! NOTICE
Risk of valve damage or impaired functioning due to an incorrectly aligned V-port
plug.
On mounting the actuator onto valves fittedwith a V-port plug, make sure that the
V-shaped port uncovered first faces toward
the valve outlet.
Î Read the 'Mounting the actuator onto
the valve' chapter in the associated valve
documentation.

5-2

Tip
The valve and actuator are assembled withspecial attention paid to the actuator's benchrange and direction of action. These details
are specified on the actuator nameplate (seethe 'Markings on the device' chapter).

a) Valve version without antirotation fixture
1. Loosen the lock nut (10) and stem connector nut (9) on the valve.
2. Firmly press the plug together with theplug stem into the seat ring.
3. Thread down the lock nut and stem connector nut.
4. Remove the clamps of the stem connector(A26/A27) and the ring nut (A8) fromthe actuator.
5. Slide the ring nut over the plug stem.
6. Place the actuator onto the valve bonnet(2) and secure it with the ring nut.
7. Connect the signal pressure (see Chapter 5.2.2).
8. Screw on the stem connector nut (9) byhand until it touches the actuator stem
(A7).
9. Turn the stem connector nut a further
quarter turn and secure this position withthe lock nut (10).
10. Position the stem connector clamps(A26/A27) and screw them tight.

EB 8310-6 ENxInstallation

A7
a

A8
A26/27
84
9
2
10
8

2

Bonnet/flange

A7

Actuator stem

8

Threaded bushing

A8

Ring nut

9

Stem connector nut

10

Lock nut

84

Travel indicatorscale

A26/27 Stem connector
clampsDim. A Refer to Table 5-1

Dim. xSee section 'Reversal of the directionof action' in the'Servicing and conversion' chapter.

Fig. 5-1: Type 3271 Pneumatic Actuator mounted on a globe valve

11. Make sure that the dimension a is adjusted as specified in Table 5-1.
12. Align the travel indicator scale (84) withthe tip of the stem connector clamp.

EB 8310-6 EN

5-3

Installation

Table 5-1: Values for dimension x 1) (see Fig. 5-1)
Actuator area
240

2)

350

700
1)
2)

2)

Travel in mm

Dimension a in mm

0 (0 %)

75

15 (100 %)60

17 (112.5 %)58

0 (0 %)

75

15 (100 %)60

19 (125 %)53

0 (0 %)

90

30 (100 %)60

38 (125 %)52

Type 3271: bottom edge of the bottom case to the top of the actuator stem
Type 3277: bottom edge of the bottom case to the top of the actuator stem
Only applies to devices already in useb) Valve version with antirotation fixture

3. Remove the clamps of the stem connector(A26) and the ring nut (A8) from the actuator.

1. Firmly press the plug together with theplug stem into the seat ring.

4. Slide the ring nut over the plug stem.

2. Anti-rotation fixture not yet mounted
onto the valve:
Follow the instructions described under'Mounting the external anti-rotation fixture' in the associated valve documentation up to the point where the actuator is
to be mounted.
Anti-rotation fixture already mounted
onto the valve:
Slightly loosen the screws (303) and turnthe stem (9) inside the stem connector
clamps (301) by a few turns to move it
downward.

5-4

5. Place the actuator onto the valve bonnet(2) and secure it with the ring nut.
6. Connect the signal pressure (see Chapter 5.2.2).
7. Continue following the instructions described under 'Mounting the external anti-rotation fixture' in the associated valve
documentation from the point where thestem (9) is threaded upwards until thehead of the stem rests on the extended
actuator stem.
8. Align and fasten the travel indicatorscale as described in the 'Mounting theactuator onto the valve' chapter in theassociated valve documentation.

EB 8310-6 EN

Installation

2
A8
A7
A8

A26

A7

9

A26

303

9
301

2

303
301

A7

Actuator stem

2

Valve bonnet

A8

Ring nut

9

Stem

301

Clamps303

ScrewsA26 Stem connector clamps

Fig. 5-2: Anti-rotation fixture: standard version (left) and special version (right)

EB 8310-6 EN

5-5

Installation

5.2.2

Pneumatic connection

Determine the lower and upper signal pressure range values before connecting the supply air:− The lower signal pressure range value isthe same as the minimum value of thebench range or operating range (withpreloaded springs).
− The upper signal pressure range value isthe same as the maximum value of thebench range or operating range (withpreloaded springs).
− For actuator springs that are to be preloaded subsequently, determine the upper and lower signal pressure range as
described in the section 'Spring compression' in the 'Start-up' chapter.

a) Actuator stem extends
1. Apply a signal pressure that corresponds
to the lower signal pressure range value
to the connection on the bottom diaphragm case.
2. Screw the vent plug into the connection
on the top diaphragm case.

b) Actuator stem retracts
1. Apply a signal pressure that corresponds
to the upper signal pressure range value
to the connection on the top diaphragmcase.
2. Screw the vent plug into the connection
on the bottom diaphragm case.

5-6

EB 8310-6 EN

Start-up

6 Start-up
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.
! DANGER
Risk of bursting due to incorrect opening ofpressurized equipment or components.
Pneumatic actuators are pressure equipmentthat may burst when handled incorrectly.
Flying projectile fragments or components
can cause serious injury or even death.
Before working on the actuator:
Î Depressurize all plant sections concerned
and the actuator. Release any stored energy.
! WARNING
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. These actuators can be identified byseveral longer bolts with nuts protrudingfrom the bottom diaphragm case. Actuatorswith considerably preloaded springs are alsolabeled correspondingly (see the 'Markings
on the device' chapter).
Î Only open the actuator following the instructions in this document. See section'Relieving the spring compression in theactuator' in the 'Removal' chapter.

EB 8310-6 EN! WARNING
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,air is vented during operation.
Î Wear eye and hearing protection whenworking near the actuator.
! WARNING
Crush hazard arising from the moving actuator stem.
Î Do not insert hands or finger into theyoke while the air supply is connected tothe actuator.
Î Before working on the actuator, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into theyoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due toseizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.
! WARNING
Risk of personal injury due to incorrect operation, use or installation as a result of incorrect information on the actuator.
After any adjustment or conversion work, thedetails on the actuator nameplate may no

6-1

Start-up

longer be correct. This may apply, for example, to the configuration ID or the symbol after reversal of the direction of action.
Î Immediately renew any nameplates orlabels with incorrect or outdated information.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.
! NOTICE
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques when tightening actuator components. Excessive tightening torques lead to parts wearing out more
quickly. Parts that are not tightened far
enough may loosen.
Î Observe the specified tightening torques(u AB 0100).
! NOTICE
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON(u AB 0100).

6.1 Spring compression
See Fig. 6-1− In combination with a SAMSON valve:the actuator travel range can be adapted
to a smaller valve travel range

6.1.1

Tensioning the springs! NOTICE
Risk of actuator damage due to the springs
being tensioned unevenly.
Î Distribute clamping bolts and nuts evenly
around the circumference.
Î Tighten the nuts gradually in a crisscrosspattern.
1. Distribute the long bolts (A22) evenly
around the circumference.
2. Screw the long nuts (A23) together with
washers (A25) onto the clamping bolts(A22) until they rest on the bottom diaphragm case (A2).
3. To tension the springs evenly, tighten thenuts (A23) gradually in a crisscross pattern until both diaphragm cases (A1, A2)
rest on the diaphragm (A4). Hold thebolt head stationary with a suitable tool
and apply the tightening torque to thenuts. Observe tightening torques.
4. Insert the short bolts (A20) through theintended holes in the diaphragm cases(A1, A2).

By preloading the springs in the actuator, thefollowing can be achieved:− The thrust is increased (only actuatorswith "stem extends")

6-2

EB 8310-6 EN

Start-up

5. Screw the short nuts (A21) with washers(A25) onto the bolts (A20). Observetightening torques.

6.1.2

Increasing the actuator
thrust

The thrust can only be increased in actuatorswith "stem extends" direction of action. To
achieve this, the springs of the actuators canbe preloaded by up to 12.5 % (240 1) cm²)
or by up to 25 % (350 and 700 1) cm²) of
1)

their travel or bench range.
Example: Preloading is required for a benchrange of 0.4 to 2 bar. 25 % of this span is
0.4 bar. Therefore, the signal pressure range
is shifted by 0.4 bar to 0.8 to 2.4 bar. The
new lower signal range value is 0.8 bar andthe new upper signal range value 2.4 bar.
Î Write the new signal pressure range of
0.8 to 2.4 bar on the actuator nameplateas the operating range with preloaded
springs.

Only applies to devices already in use

A1
A20
A25
A21

A22
A25
A23
A24

A4
A2

A1

Top diaphragm caseA22

Hex bolt (preloading)

A2

Bottom diaphragm caseA23

Hex nut (preloading)

A4

Diaphragm

A24

Blanking plug

A20

Hex bolt

A25

Shim

A21

Hex nut

Fig. 6-1: Actuator with clamping nuts and bolts

EB 8310-6 EN

6-3

Start-up

6.1.3

Adapting the travel
range

In some cases, the valve and actuator havedifferent rated travels. Depending on the direction of action, proceed as follows:
Direction of action: actuator stem extends
Always use actuators with preloaded springs
when the valve's rated travel is smaller than
the rated travel of the actuator.

At half the valve travel, the operating range
is between 0.2 and 0.6 bar.

6.2 Travel stop
See Fig. 6-2
In the version with travel stop, the maximum
and minimum actuator travel can be limited
as follows:

Example: DN 50 valve with 15 mm rated
travel and 700 1) cm² actuator with 30 mm
rated travel; 0.4 to 2 bar bench range.
The signal pressure for half the actuator travel (15 mm) is 1.2 bar. Adding it to the lower
signal pressure range value of 0.4 bar results in a signal pressure of 1.6 bar required
for spring compression. The new lower signal range value is 1.6 bar and the new upper signal range value 2.4 bar.
Î Write the new signal pressure range of
1.6 to 2.4 bar on the actuator nameplateas the operating range with preloaded
springs.
Direction of action: actuator stem retracts
The springs of actuators with "stem retracts"
action cannot be preloaded. When a SAMSON valve is combined with an oversizedactuator (e.g. the rated travel of the actuatoris larger than the rated travel of the valve),
only the first half of the actuator's benchrange can be used.
Example: DN 50 valve with 15 mm rated
travel and 700 1) cm² actuator with 30 mm
rated travel; 0.2 to 1 bar bench range.

6-4

Direction ofactionMin. stop

Max. stop

Stem extends (FA)

0 to 125 %50 to 125 %Stem retracts (FE)

0 to 100 %50 to 100 %6.2.1 Bottom travel stop(minimum travel)
1. Loosen top lock nut (A74) and unscrew
cover (A73).
2. Loosen bottom lock nut (A74) and turnthe adjustment nut (A70) to adjust thetravel stop.
3. Tighten bottom lock nut (A74).
4. Attach cover (A73) and retighten locknut (A74).

6.2.2 Top travel stop (maximum
travel)1. Loosen top lock nut (A74).
2. Adjust the cover (A73) to the required
travel stop.
3. Retighten top lock nut (A74).
1)

Only applies to devices already in use

EB 8310-6 EN

Start-up

Left half:
Right half:

Actuator stem retracts (FE)Actuator stem extends (FA)

A73
A74

A70

A75
A50

A5
A7

A5

Diaphragm plate

A73 Cover

A7

Actuator stem

A74 Lock nut

A50 Top actuator stem

A75 Top diaphragm case

A70 Adjustment nut
Fig. 6-2: Travel stop

6.3 Version with handwheel
See Fig. 6-3
The stem connector (A51) connects the actuator stem (A7) with the actuator stem (A50)of the handwheel. The actuator stem position
can be adjusted using the handwheel (A60).

EB 8310-6 EN

NoteContact our after-sales service to retrofit anactuator with a handwheel.

6-5

Start-up

6.3.1

Extending the actuator
stem manually

A60

1. Loosen the lock nut (A66) to unlock the
handwheel (A60).
2. Turn the handwheel clockwise to extend
the actuator stem.
3. To change from manual to automatic operation, put the handwheel into the neutral position by aligning the pointer(A55) with the groove on the stem connector (A51).

A51

A66

A55
A50

4. Tighten the lock nut (A66) to lock the
handwheel.

6.3.2

A75

Retracting the actuator
stem manually

1. Loosen the lock nut (A66) to unlock the
handwheel (A60).
2. Turn the handwheel counterclockwise to
retract the actuator stem.
3. To change from manual to automatic operation, put the handwheel into the neutral position by aligning the pointer(A55) with the groove on the stem connector (A51).
4. Tighten the lock nut (A66) to lock the
handwheel.

A7

A7

Actuator stem

A50

Top actuator stem

A51

Stem connector

A55

Pointer

A60

Handwheel

A66

Lock nut

A75

Top diaphragm caseFig. 6-3: Pneumatic actuator with handwheel

6-6

EB 8310-6 EN

Operation

7 Operation
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.
! WARNING
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,air is vented during operation.
Î Wear eye and hearing protection whenworking near the actuator.
! WARNING
Crush hazard arising from the moving actuator stem.
Î Do not insert hands or finger into theyoke while the air supply is connected tothe actuator.
Î Before working on the actuator, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into theyoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due to seizing up after remaining in the same position for a long time), release any stored
energy in the actuator (e.g. spring compression). See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.

! WARNING
Risk of personal injury due to incorrect operation, use or installation as a result of incorrect information on the actuator.
After any adjustment or conversion work, thedetails on the actuator nameplate may nolonger be correct. This may apply, for example, to the configuration ID or the symbol after reversal of the direction of action.
Î Immediately renew any nameplates orlabels with incorrect or outdated information.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.

7.1 Throttling service
The maximum permissible supply pressure is
specified in the order confirmation for thecontrol valve. However, the supply pressureof the Type 3271 and Type 3277 Pneumatic
Actuators with 240 1), 350 and 700 1) cm²
actuator areas must not exceed 6 bar inthrottling service.

7.2 On/off service
In on/off service, the supply pressure mustbe limited depending on the bench range or
operating range of the actuator. The applicable bench range or operating range which
the actuator can move through is written on
the nameplate (see the 'Markings on the device' chapter).
1)

EB 8310-6 EN

Only applies to devices already in use

7-1

Operation

Actuator stem retracts (FE)For the direction of action "actuator stem retracts", the permissible supply pressure must
not exceed the upper bench range value by
more than 3 bar:
Bench range
0.2 to 1.0 bar
0.4 to 2.0 bar
0.6 to 3.0 bar

Fail-safe action
Actuator stem
retracts

Max. supply pressure
4 bar
5 bar
6 bar

Actuator stem extends (FA)With fail-safe action "actuator stem extends"
and travel stop, the supply pressure must notexceed the upper bench range value by
more than 1.5 bar.

7.4 Additional notes concerning operation
Î Label actuator with reduced supply pressure with a sticker ("Max. supply pressure limited to ... bar").
Î Only apply the signal pressure to the signal pressure connection (S) on the diaphragm chamber of the actuator which
does not contain any springs (seeFig. 3-1 and Fig. 3-2 in the 'Design andprinciple of operation' chapter).
Î Only use vent plugs that let air throughthem (A16 in Fig. 3-1 and Fig. 3-2 in the'Design and principle of operation'
chapter).

7.3 Manual mode (versions
with handwheel only)
In the manual mode, the valve is opened
and closed by the handwheel. The valve position is independent of the signal pressureor actuator springs.
The handwheel must be in the neutral position to allow the actuator to move through its
entire travel range in throttling or on/off service.
In Type 3271 and Type 3277 Pneumatic Actuators with 700 1) cm² actuator area and ahandwheel, the upper bench range value
must not exceed 3.3 bar.

1)

Only applies to devices already in use

7-2

EB 8310-6 ENMalfunctions

8 Malfunctions
Read hazard statements, warnings and caution notes in the 'Safety instructions and measures' chapter.

8.1 Troubleshooting
Malfunction

Possible reasons

Recommended action

Actuator stem does not
move on demand.

Actuator is blocked.

Check attachment.
Remove the blockage.
WARNING! A blocked actuator (e.g. due to seizing
up after remaining in the same position for a longtime) can suddenly start to move uncontrollably.
Injury to hands or fingers is possible if they are
inserted into the actuator or valve.
Before trying to unblock the actuator stem,
disconnect and lock the pneumatic air supply aswell as the control signal. Before unblocking theactuator stem, release any stored energy in theactuator (e.g. spring compression). See section'Relieving the spring compression in the actuator' in
the 'Removal' chapter.

Insufficient signal pressure

Check the signal pressure.
Check the signal pressure line for leakage.

Signal pressure notconnected to the correct diaphragm chamber.

See section 'Signal pressure routing' in the 'Design
and principle of operation' chapter.

Diaphragm in the actu- See 'Replacing the diaphragm' in the 'Servicing'ator defective
chapter.
Actuator stem does not
stroke through its complete travel range.

Travel stop active

See section 'Adjusting the travel stop' in the 'Startup' chapter.

Insufficient signal pressure

Check the signal pressure.
Check the signal pressure line for leakage.

Incorrect setting ofvalve accessories.

Check the actuator without valve accessories.
Check the settings of the valve accessories.

Note
Contact our after-sales service for malfunctions not listed in the table.

EB 8310-6 EN

8-1

Malfunctions

8.2 Emergency action
Plant operators are responsible for emergency action to be taken in the plant.

8-2

EB 8310-6 EN

Servicing and conversion

9 Servicing and conversion
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.
The following documents are also required
for servicing the valve:− u AB 0100 for tools, tightening torques
and lubricant! DANGER
Risk of bursting due to incorrect opening ofpressurized equipment or components.
Pneumatic actuators are pressure equipmentthat may burst when handled incorrectly.
Flying projectile fragments or components
can cause serious injury or even death.
Before working on the actuator:
Î Depressurize all plant sections concerned
and the actuator. Release any stored energy.
! WARNING
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. These actuators can be identified byseveral longer bolts with nuts protrudingfrom the bottom diaphragm case. Actuatorswith considerably preloaded springs are alsolabeled correspondingly (see the 'Markings
on the device' chapter).
Î Only open the actuator following the instructions in this document. See section'Relieving the spring compression in theactuator' in the 'Removal' chapter.

EB 8310-6 EN! WARNING
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,air is vented during operation.
Î Wear eye and hearing protection whenworking near the actuator.
! WARNING
Crush hazard arising from the moving actuator stem.
Î Do not insert hands or finger into theyoke while the air supply is connected tothe actuator.
Î Before working on the actuator, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into theyoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due toseizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.
! WARNING
Risk of personal injury due to incorrect
operation, use or installation as a result ofincorrect information on the actuator.
After any adjustment or conversion work, thedetails on the actuator nameplate may no

9-1

Servicing and conversion

longer be correct. This may apply, for example, to the configuration ID or the symbol after reversal of the direction of action.
Î Immediately renew any nameplates orlabels with incorrect or outdated information.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.
! NOTICE
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques when tightening actuator components. Excessive tightening torques lead to parts wearing out more
quickly. Parts that are not tightened far
enough may loosen.
Î Observe the specified tightening torques(u AB 0100).
! NOTICE
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON(u AB 0100).
! NOTICE
Risk of valve damage due to the use of unsuitable lubricants.
Î Only use lubricants approved by
SAMSON (u AB 0100).

9-2

Note
− The product warranty becomes void ifservice or repair work not described inthese instructions is performed without
prior agreement by SAMSON's After-sales
Service.
− Only use original spare parts by
SAMSON, which comply with the original
specifications.

9.1 Periodic testing
Depending on the operating conditions,check the actuator at certain intervals to prevent possible failure before it can occur.
Plant operators are responsible for drawing
up an inspection and test plan.
Tip
Our after-sales service can support you in
drawing up an inspection and test plan foryour plant.

9.2 Preparation for servicing
or conversion work
1. Lay out the necessary material and tools
to have them ready for the intendedwork.
2. Put the actuator out of operation (see the'Decommissioning' chapter).
3. Remove the actuator from the valve (seethe 'Removal' chapter).

EB 8310-6 EN

Servicing and conversion

Note
To remove an actuator with "stem extends"
fail-safe action and/or with preloaded
springs, a certain signal pressure must be
applied to the actuator (see the 'Removal'
chapter). Afterwards, the signal pressuremust be removed and the air supply disconnected again and locked.

9.3 Mounting the actuator on
the valve after service orconversion work
1. Mount the actuator onto the valve (seethe 'Installation' chapter).
2. Adjust the upper or lower bench range
values (see the 'Start-up' chapter).

4. Relieve the compression from the preloaded springs. See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.

9.4 Service work

5. Unthread and remove the bolts and nuts
including shims from around the diaphragm case. Keep the parts in a safe
place for later use.

9.4.1

The following service and/or conversion
work can be performed after preparation iscompleted:! NOTICE− Replace the diaphragm (see Chapter 9.4.1)− Replace the actuator stem seals (seeChapter 9.4.2)

See Fig. 3-1 and Fig. 3-2 in the 'Design andprinciple of operation' chapter

Replacing the diaphragm

Risk of malfunction due to damaged hose
clamp.
Î Do not reuse hose clamps.
Î Use a new hose clamp every time the diaphragm is replaced.

− Reverse the direction of action (seeChapter 9.5.1)

EB 8310-6 EN

9-3

Servicing and conversion! NOTICE
Risk of property damage and malfunction
due to incorrect mounting of the hose
clamp.
Î Tighten the hose clamp by hand using atorque wrench. Observe the tightening
torque and position it centrically.

a) Actuator stem extends
See Fig. 9-1
1. Lift off the top diaphragm case (A1) andremove springs (A10).
2. Pull the diaphragm plate assembly consisting of the diaphragm plate (A5), diaphragm (A4) and actuator stem (A7) outof the bottom diaphragm case (A2).
3. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
jaws. Make sure that the actuator stem is
not damaged.

A4

A5

A15

A6
A9
A7
A19

4. 240 1) cm²: undo the latch of the hose
clamp (A6). Take the hose clamp (A6)and diaphragm (A4) off the diaphragmplate (A5).
350 and 700 1) cm²: undo the latch of
the hose clamp (A6). Take the compressor (A19), hose clamp (A6) and diaphragm (A4) off the diaphragm plate(A5).
5. Mount the new diaphragm (A4). Make
sure the diaphragm is correctly alignedwith the diaphragm plate. The imaginaryline through two opposing recesses forsprings on the diaphragm plate must bealigned centrally between two bolting
holes in the diaphragm (see Fig. 9-2).
6. Place the hose clamp (A6) evenly into thegroove in the diaphragm (A4) intended
for it.
7. 240 1) cm²: turn the screw on the latch of
the hose clamp until the hose clamp rests
completely in the groove. Tighten thescrew of the latch using a suitable tool.
Observe tightening torques.

A4

Diaphragm

A5

Diaphragm plate

A6

Hose clamp

A7

Actuator stem

A9

Hex nut

A15 Collar nut
A19 Compressor on the hose
clamp (A6)

Fig. 9-1: Arrangement of parts for "stem extends" direction of action

9-4

EB 8310-6 EN

Servicing and conversion==

Bolting hole

Recess for spring

Fig. 9-2: Aligning the diaphragm

350 and 700 1) cm²: turn the screw on
the latch of the hose clamp until only agap of just a few millimeters remains between the diaphragm (A4) and hose
clamp (A6).
Place and align the compressor (A19)
beneath the clamp's latch (see Fig. 9-2).
Tighten the screw of the latch using asuitable tool. Observe tightening torques.
8. Apply a suitable lubricant to the actuator
stem (A7).
9. Place the diaphragm plate assembly consisting of the diaphragm plate (A5), newdiaphragm (A4) and actuator stem (A7)
into the bottom diaphragm case (A2).
Make sure that the sealing elements are
not damaged.
1)

Only applies to devices already in use

EB 8310-6 EN

10. Place the springs (A10) into the bottom
diaphragm case, centering them in theintended recesses.
11. Place on the top diaphragm case (A1).
12. If necessary, preload the springs (see the'Start-up' chapter).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

b) Actuator stem retracts
See Fig. 9-3
1. Lift off the top diaphragm case (A1).
2. Pull the diaphragm plate assembly
consisting of the diaphragm plate (A5),9-5Servicing and conversion

diaphragm (A4) and actuator stem (A7)out of the actuator.
3. Take the springs (A10) out of the bottom
diaphragm case (A2).
4. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
jaws. Make sure that the actuator stem is
not damaged.

7. Place the hose clamp (A6) evenly into thegroove in the diaphragm (A4) intended
for it.
8. 240 1) cm²: turn the screw on the latch of
the hose clamp until the hose clamp rests
completely in the groove. Tighten thescrew of the latch using a suitable tool.
Observe tightening torques.
350 and 700 1) cm²: turn the screw on
the latch of the hose clamp until only agap of just a few millimeters remains between the diaphragm (A4) and hose
clamp (A6).
Place and align the compressor (A19)
beneath the clamp's latch (see Fig. 9-2).
Tighten the screw of the latch using asuitable tool. Observe tightening torques.

5. 240 1) cm²: undo the latch of the hose
clamp (A6). Take the hose clamp (A6)and diaphragm (A4) off the diaphragmplate (A5).
350 and 700 1) cm²: undo the latch of
the hose clamp (A6). Take the compressor (A19), hose clamp (A6) and diaphragm (A4) off the diaphragm plate(A5).
6. Mount the new diaphragm (A4). Make
sure the diaphragm is correctly alignedwith the diaphragm plate. The imaginaryline through two opposing recesses forsprings on the diaphragm plate must bealigned centrally between two bolting
holes in the diaphragm (see Fig. 9-2).

9. Apply a suitable lubricant to the actuator
stem (A7).
10. Clamp the top diaphragm case (A1) withthe opening facing upward into a suitable clamping fixture.
11. Place the diaphragm plate assembly consisting of the diaphragm plate (A5), new
1)

A4

A6

A5

A15

A9
A7

A19

Only applies to devices already in use

A4Diaphragm

A5

Diaphragm plate

A6

Hose clamp

A7

Actuator stem

A9

Hex nut

A15 Collar nut
A19 Compressor on the hose
clamp (A6)

Fig. 9-3: Arrangement of parts for "stem retracts" direction of action

9-6

EB 8310-6 EN

Servicing and conversion

diaphragm (A4) and actuator stem (A7)with the actuator stem pointing upward
into the diaphragm case (A1).

Type 3271
A40
A42

12. Place the springs (A10) in the diaphragmplate (A5), centering them in the intended recesses.

A7

13. Carefully guide the bottom diaphragmcase (A2) over the actuator stem (A7)and place it on the springs (A10). Make
sure that the sealing elements are notdamaged. Ensure that the compressed
air connections on the cases (A1, A2)
are correctly aligned with each other.

A41

14. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

9.4.2

Type 3277

Replacing the actuator
stem seals

A40
A42

See Fig. 9-4a) Actuator stem extends

A42
A41

1. Lift off the top diaphragm case (A1) andremove springs (A10).
2. Pull the diaphragm plate assembly consisting of the diaphragm plate (A5), diaphragm (A4) and actuator stem (A7) outof the bottom diaphragm case (A2).
3. Use a suitable punch to remove the radial shaft seal (A40).
4. Check the dry bearing (A42) and wiper(A41) and renew them, if necessary.
5. Apply a suitable lubricant to the seal lipof the new radial shaft seal.

EB 8310-6 ENA7Actuator stem

A40

Radial shaft seal

A41

Wiper ring

A42

Dry bearing

Fig. 9-4: Actuator stem seals

9-7Servicing and conversion

6. Use a suitable tool to mount the radial
shaft seal. Observe the correct alignmentof the radial shaft seal (see Fig. 9-4).
7. Fill the cavity of the radial shaft seal, in
which the spring is seated, with lubricant.
8. Apply a suitable lubricant to the actuator
stem (A7).
9. Place the diaphragm plate assembly consisting of the diaphragm plate (A5), newdiaphragm (A4) and actuator stem (A7)
into the bottom diaphragm case (A2).
Make sure that the sealing elements are
not damaged. Ensure that the compressed air connections on the cases(A1, A2) are correctly aligned with eachother.
10. Place the springs (A10) into the bottom
diaphragm case, centering them in theintended recesses.
11. Place on the top diaphragm case (A1).
12. If necessary, preload the springs (see the'Start-up' chapter).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

b) Actuator stem retracts
1. Lift off the top diaphragm case (A1).
2. Pull the diaphragm plate assembly consisting of the diaphragm plate (A5), diaphragm (A4) and actuator stem (A7) outof the actuator.
3. Take the springs (A10) out of the bottom
diaphragm case (A2).
9-8

4. Use a suitable punch to remove the radial shaft seal (A40).
5. Check the dry bearing (A42) and wiper(A41) and renew them, if necessary.
6. Apply a suitable lubricant to the seal lipof the new radial shaft seal.
7. Use a suitable tool to mount the radial
shaft seal. Observe the correct alignmentof the radial shaft seal (see Fig. 9-4).
8. Fill the cavity of the radial shaft seal, in
which the spring is seated, with lubricant.
9. Apply a suitable lubricant to the actuator
stem (A7).
10. Clamp the top diaphragm case (A1) withthe opening facing upward into a suitable clamping fixture.
11. Place the diaphragm plate assembly together with the actuator stem (A7) pointing upward into the diaphragm case
(A1).
12. Place the springs (A10) in the diaphragmplate (A5), centering them in the intended recesses.
13. Carefully guide the bottom diaphragmcase (A2) over the actuator stem (A7)and place it on the springs (A10). Make
sure that the sealing elements are notdamaged. Ensure that the compressed
air connections on the cases (A1, A2)
are correctly aligned with each other.
14. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

EB 8310-6 EN

Servicing and conversion

9.5 Conversion work

See Fig. 9-5! NOTICE
Malfunction due to loosened nut (A9).
The nut (A9) on the actuator stem serves toadjust the dimension x.
Î Do not undo the nut (A9).
Î If the nut (A9) has been loosened, readjust the dimension x as specified in Table
9-1.

The direction of action (and fail-safe action)of pneumatic actuators can be changed. The
fail-safe action is indicated on the nameplateby a symbol:

5. Remove the diaphragm plate (A5) withdiaphragm (A4) from the actuator stemand place them back on in reverse order.

See Fig. 3-1 and Fig. 3-2 in the 'Design andprinciple of operation' chapter

9.5.1

Reversing the directionof action

Actuator stem extends
Actuator stem retractsa) Reversal of the direction ofaction from stem extends tostem retracts
1. Lift off the top diaphragm case (A1) andremove springs (A10).
2. Pull the diaphragm plate assembly consisting of the diaphragm plate (A5), diaphragm (A4) and actuator stem (A7) outof the bottom diaphragm case (A2).
3. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
jaws. Make sure that the actuator stem is
not damaged.
4. Completely unscrew the collar nut (A15),
while holding the nut (A9) stationary.

EB 8310-6 EN

6. Tighten retaining nut (A82) while holdingnut (A9) stationary. Observe tightening
torques.
7. Unscrew the distance piece (A87).
8. Apply a suitable lubricant to the actuator
stem (A7).
9. Clamp the top diaphragm case (A1) withthe opening facing upward into a suitable clamping fixture.
10. Place the diaphragm plate assembly together with the actuator stem (A7) pointing upward into the diaphragm case
(A1).
11. Place the springs (A10) in the diaphragmplate (A5), centering them in the intended recesses.
12. Carefully guide the bottom diaphragmcase (A2) over the actuator stem (A7)and place it on the springs (A10). Make
sure that the sealing elements are notdamaged. Ensure that the compressed
air connections on the cases (A1, A2)
are correctly aligned with each other.

9-9Servicing and conversion

A4

A5

A15

A5

A4

A15

A6
A9

X

A9

X

A6

A7

A7
A19
A19
A4

Diaphragm

A9

Hex nut

A5

Diaphragm plate

A15

Collar nut

A6

Hose clamp

A19

Compressor

A7

Actuator stem

Fig. 9-5: Arrangement of parts for "stem retracts" direction of action (left) and "stem extends"
direction of action (right)

Table 9-1: Values for dimension x (see Fig. 9-5)
Type

3271

Travel in mm

240 1)

15

98.25

350

15

107.25700 1)

30

144

1)

15

–

350

15

209

700 1)

30

246

240
3277

1)

Dimension x in mm(top of the nut to the bottom of the actuator stem)

Actuator area

Only applies to devices already in use

9-10

EB 8310-6 EN

Servicing and conversion

13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.
14. Unscrew the vent plug (A16) from the top
signal pressure connection and screw it
into the bottom connection (S).
The actuator springs, which now pushagainst the diaphragm plate from below,
cause the actuator stem to retract. The
signal pressure is connected to the top
connection (S) on the top diaphragmcase. As a result, the actuator stem extends opposing the spring force as thesignal pressure increases.
15. Affix a new nameplate with changed
symbol and new configuration ID to theactuator.

b) Reversal of the direction ofaction from stem retracts tostem extends
1. Lift off the top diaphragm case (A1).
2. Pull the diaphragm plate assembly consisting of the diaphragm plate (A5), diaphragm (A4) and actuator stem (A7) outof the actuator.
3. Take the springs (A10) out of the bottom
diaphragm case (A2).
4. Completely unscrew the collar nut (A15),
while holding the nut (A9) stationary.

! NOTICE
Malfunction due to loosened nut (A9).
The nut (A9) on the actuator stem serves toadjust the dimension x.
Î Do not undo the nut (A9).
Î If the nut (A9) has been loosened, readjust the dimension x as specified in Table
9-1.
5. Clamp the bottom section of the actuator
stem (A7) into a vise using protective
jaws. Make sure that the actuator stem is
not damaged.
6. Remove the diaphragm plate (A5) withdiaphragm (A4) from the actuator stemand place them back on in reverse order.
7. Tighten the collar nut (A15), while holding the nut (A9) stationary. Observetightening torques.
8. Apply a suitable lubricant to the actuator
stem (A7).
9. Place the diaphragm plate assembly together with the actuator stem (A7) pointing downward into the bottom diaphragm case (A2). Make sure that thesealing elements are not damaged.
10. Place the springs (A10) into the bottom
diaphragm case, centering them in theintended recesses.
11. Place on the top diaphragm case (A1).
12. If necessary, preload the springs (see the'Start-up' chapter).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts

EB 8310-6 EN

9-11

Servicing and conversion(A21) and bolts (A20). Observe tightening torques.
14. Unscrew the vent plug (A16) from thebottom signal pressure connection andscrew it into the top connection (S).
The actuator springs, which now pushagainst the diaphragm plate from above,cause the actuator stem to extend. The
signal pressure is connected to the bottom connection (S) on the bottom diaphragm case. As a result, the actuator
stem retracts opposing the spring force
as the signal pressure increases.
15. Affix a new nameplate with changed
symbol and new configuration ID to theactuator.

9-12

9.6 Ordering spare parts andoperating supplies
Contact your nearest SAMSON subsidiaryor SAMSON's After-sales Service for information on spare parts, lubricants and tools.
Spare parts
See Annex for details on spare parts.
LubricantSee document u AB 0100 for details on
suitable lubricants.
Tools
See document u AB 0100 for details on
suitable tools.

EB 8310-6 EN

Decommissioning

10 Decommissioning
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.
! DANGER
Risk of bursting due to incorrect opening ofpressurized equipment or components.
Pneumatic actuators are pressure equipmentthat may burst when handled incorrectly.
Flying projectile fragments or components
can cause serious injury or even death.
Before working on the actuator:
Î Depressurize all plant sections concerned
and the actuator. Release any stored energy.
! WARNING
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. These actuators can be identified byseveral longer bolts with nuts protrudingfrom the bottom diaphragm case. Actuatorswith considerably preloaded springs are alsolabeled correspondingly (see the 'Markings
on the device' chapter).
Î Only open the actuator following the instructions in this document. See section'Relieving the spring compression in theactuator' in the 'Removal' chapter.

! WARNING
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,air is vented during operation.
Î Wear eye and hearing protection whenworking near the actuator.
! WARNING
Crush hazard arising from the moving actuator stem.
Î Do not insert hands or finger into theyoke while the air supply is connected tothe actuator.
Î Before working on the actuator, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into theyoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due toseizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.
To decommission the actuator for service
work or before removing it from the valve,proceed as follows:
1. Put the control valve out of operation.
See associated valve documentation.
2. Disconnect the pneumatic air supply todepressurize the actuator.

EB 8310-6 EN

10-1

10-2

EB 8310-6 EN

Removal

11 Removal
The work described in this chapter is to be
performed only by personnel appropriately
qualified to carry out such tasks.
! DANGER
Risk of bursting due to incorrect opening ofpressurized equipment or components.
Pneumatic actuators are pressure equipmentthat may burst when handled incorrectly.
Flying projectile fragments or components
can cause serious injury or even death.
Before working on the actuator:
Î Depressurize all plant sections concerned
and the actuator. Release any stored energy.
! WARNING
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. These actuators can be identified byseveral longer bolts with nuts protrudingfrom the bottom diaphragm case. Actuatorswith considerably preloaded springs are alsolabeled correspondingly (see the 'Markings
on the device' chapter).
Î Only open the actuator following the instructions in this document. See section'Relieving the spring compression in theactuator' in the 'Removal' chapter.

EB 8310-6 EN! WARNING
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,air is vented during operation.
Î Wear eye and hearing protection whenworking near the actuator.
! WARNING
Crush hazard arising from the moving actuator stem.
Î Do not touch the actuator stem or insert
hands or finger into the yoke while theair supply is connected to the actuator.
Î Before working on the actuator, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator stem by inserting objects into theyoke.
Î Before unblocking the actuator stem after
it has become blocked (e.g. due toseizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See section 'Relieving thespring compression in the actuator' in the'Removal' chapter.
Before removing the valve, make sure the following conditions are met:
− The actuator is put out of operation (seethe 'Decommissioning' chapter).

11-1

Removal

11.1 Removing the actuatorfrom the valve
1. Undo the clamps of the stem connector(A26/27).
2. Loosen the stem connector nut (9) andlock nut (10).

2. Loosen the long clamping nuts and boltson the diaphragm cases evenly in acrisscross pattern to gradually relieve thespring compression. Hold the bolt headstationary with a suitable tool and apply
the torque to the nuts.

3. Removing actuators with "stem extends" action with/without preloaded
springs: to undo the ring nut (A8), apply
approx. 50 % signal pressure to open thevalve.
4. Unscrew the ring nut (A8) on the valve
bonnet (2).
5. Disconnect the signal pressure again.
6. Remove the ring nut (A8) and actuatorfrom the valve.
7. Fasten the lock nut (10) and stem connector nut (9) on the valve.

11.2 Relieving the spring compression in the actuator

Short bolt
WasherShort nut
Clamping bolt

WasherClamping nut
Fig. 11-1: Preloaded springs

The long clamping bolts with long clamping
nuts and the short bolts with short nuts arearranged evenly around the circumference of
the actuator housing to fasten the top andbottom diaphragm cases together. The
springs in the actuator are compressed using
the long clamping nuts and bolts.
To relieve the compression of the springs in
the actuator, proceed as follows:
1. Unthread and remove the short nuts andbolts (including the washers) on the diaphragm cases.

11-2

EB 8310-6 ENRepairs

12 Repairs
If the actuator does not function properly according to how it was originally sized ordoes not function at all, it is defective andmust be repaired or exchanged.
! NOTICE
Risk of actuator damage due to incorrect
service or repair work.
Î Do not perform any repair work on yourown.
Î Contact SAMSON's After-sales Service
for service and repair work.

12.1 Returning devices to
SAMSON
Defective devices can be returned to
SAMSON for repair.
Proceed as follows to return devices:− Completed Declaration on
Contamination, which can be
downloaded from our website atu www.samsongroup.com > Service> After-sales Service.
After checking your registration, we will
send you a return merchandise authorization (RMA).
3. Attach the RMA (together with the Declaration on Decontamination) to the outside of your shipment so that the documents are clearly visible.
4. Send the shipment to the address givenon the RMA.
Note
Further information on returned devices andhow they are handled can be found at
u www.samsongroup.com > Service > Aftersales Service.

1. Exceptions apply concerning somespecial device models
u www.samsongroup.com > Service >After-sales Service.
2. Send an e-mailu retouren@samsongroup.com toregister the return shipment including thefollowing information:− Type− Article number− Configuration ID− Original order

EB 8310-6 EN

12-1

12-2

EB 8310-6 EN

Disposal

13 Disposal
Î Observe local, national and international refuse regulations.
Î Do not dispose of components, lubricantsand hazardous substances together withyour household waste.

EB 8310-6 EN

13-1

13-2

EB 8310-6 EN

Certificates

14 Certificates
The declarations of incorporation incompliance with Machinery Directive
2006/42/EC and the Directive 2008
No. 1597 Supply of Machinery (Safety)
Regulations 2008 for Type 3271 andType 3277 Pneumatic Actuators with 240 1),
350 und 700 1) cm² actuator areas areprovided on the following pages.
The certificates shown were up to date at thetime of publishing. The latest certificates canbe found on our website:− u www.samsongroup.com > Products >Actuators > 3271
− u www.samsongroup.com > Products >Actuators > 3277
Other optional certificates are available on
request.

1)

Only applies to devices already in use

EB 8310-6 EN

14-1

14-2

EB 8310-6 ENDeclaration of Incorporation of Partly Completed Machineryin accordance with Schedule 2 Part 2 Annex II, section 1.B. of the Directive 2008 No. 1597
Supply of Machinery (Safety) Regulations 2008
For the following product:
Type 3271 and Type 3277 Actuators
We certify that the Type 3271 and Type 3277 Actuators are partly completed machinery as defined in the in
Directive 2008 No. 1597 Supply of Machinery (Safety) Regulations 2008 and that the safety requirements stipulated in Annex I, 1.1.2, 1.1.3, 1.1.5, 1.3.2, 1.3.4 and 1.3.7 are observed. The relevant technical documentation
described in Annex VII, (Part 7 of Schedule 2) part B has been compiled.
Products we supply must not be put into service until the final machinery into which it is to be incorporated has
been declared in conformity with the provisions of the Directive 2008 No. 1597 Supply of Machinery (Safety)
Regulations 2008.
Operators are obliged to install the products observing the accepted industry codes and practices (good engineering practice) as well as the mounting and operating instructions. Operators must take appropriate precautions to prevent hazards that could be caused by the process medium and operating pressure in the valve as
well as by the signal pressure and moving parts.
The permissible limits of application and mounting instructions for the products are specified in the associatedmounting and operating instructions; the documents are available in electronic form on the Internet atwww.samsongroup.com.
For product descriptions refer to:
Types 3271 and 3277 Actuators: Mounting and Operating Instructions EB 8310-X
Referenced technical standards and/or specifications:
VCI, VDMA, VGB: "Leitfaden Maschinenrichtlinie (2006/42/EG) – Bedeutung für Armaturen, Mai 2018"[German only]
VCI, VDMA, VGB: "Zusatzdokument zum Leitfaden Maschinenrichtlinie (2006/42/EG) – Bedeutung für
Armaturen vom Mai 2018" [German only], based on DIN EN ISO 12100:2011-03
Comments:
See mounting and operating instructions for residual hazards.
Also observe the referenced documents listed in the mounting and operating instructions.

Persons authorized to compile the technical file:
SAMSON AG, Weismüllerstraße 3, 60314 Frankfurt am Main, Germany
Frankfurt am Main, 13 December 2021

Stephan Giesen

Director
Product Management

Peter Scheermesser

Director
Product Life Cycle Management and ETODevelopment for Valves and Actuators

Revision 00
Classification: Public · SAMSON AKTIENGESELLSCHAFT · Weismuellerstrasse 3 · 60314 Frankfurt am Main, Germany

EB 8310-6 EN

Page 1 of 1

14-3

14-4

EB 8310-6 EN

15 Annex

42

Dry bearing

43

Hex screw for hanger (32)15.1 Tightening torques, lubricants and tools

49

Wiper ring 1)

50

Top actuator stem

51

Stem connectoru AB 0100 for tools, tightening torques andlubricants

52

Screwed flange

54

Ring

55

Pointer

15.2 Spare parts

56

Hex nut 1)

1

Top diaphragm case

57

Coupling nut

2

Bottom diaphragm case58

Sliding washer

4

Diaphragm

59

Yoke

5

Diaphragm plate60

Handwheel

6

Hose clamp

61

Dowel pin

7

Actuator stem

62

Dowel pin

8

Ring nut

63

Threaded pin

9

Hex nut

64

Cap screw

10

Spring65

Hex bolt

11

Spring66

Lock nut

12

Spring67

Retaining ring

15

Collar nut

68

Axial needle seal

16

Vent plug

69

Washer19

Compressor on the hose clamp (6)70

Adjustment nut

20

Hex bolt

73

Cover

21

Hex nut

74

Lock nut

22

Hex bolt (preloading)75

Top diaphragm case23

Hex nut (preloading)76

Radial shaft seal

24

Blanking plug77

Dry bearing

25

Shim

100

Nameplate

101

Label (preloading)106

Grooved pin

160*

Dust shield (option)

26/27 Stem connector clamp
28

Clamp with bracket

29

Hex bolt

30

Hex nut

32

Hanger40

Radial shaft seal

41

Wiper ring

1)
2)

Only applies to actuators with 240 cm²
actuator area already in use
Replaces collar nut (15) in version with travelstop or handwheel

60
61

52

66

73
74

52

70
16
20/22

65

20/22

106
100

51
68
58
67
54
62
68
69
57
63

42
41

50
56

161*
8
59

55
64

41/49
42
20/22

16
20/22
25

106
100

75
76
77
50
56

75

50

50

16

43

20/22

12

25
106
100

1

11

15
10

5
4
6
19

9
7

9
7
40
42

2

2

32
25
21

42
41
8
160*

25
23
24

EB 8310-6 EN

30
28

26/27
28
29

15-3

Annex15.3 After-sales service
Contact our after-sales service for support
concerning service or repair work or whenmalfunctions or defects arise.
E-mail address
You can reach our after-sales service ataftersalesservice@samsongroup.com.
Addresses of SAMSON AG and its subsidiaries
The addresses of SAMSON AG, its subsidiaries, representatives and service facilities
worldwide can be found on our website(www.samsongroup.com) or in all SAMSON
product catalogs.
Required specifications
Please submit the following details:

15.4 Information on the UK
sales region
The following information corresponds to the2016 Regulations No. 1105 Pressure Equipment (Safety) Regulations 2016, STATUTORYINSTRUMENTS, 2016 No. 1105 (UKCA
marking). It does not apply to Northern Ireland.
Importer
SAMSON Controls Ltd
Perrywood Business Park
Honeycrock Lane
Redhill, Surrey RH1 5JQ
Phone: +44 1737 766391
E-mail: sales-uk@samsongroup.com
Website: uk.samsongroup.com− Order number and position number inthe order− Type, model number, actuator area, travel, direction of action and bench range(e.g. 0.2 to 1 bar) or the operating
range of the actuator− Type designation of mounted valve (ifapplicable)− Installation drawing

15-4

EB 8310-6 EN

SAMSON AKTIENGESELLSCHAFT
Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507
samson@samsongroup.com · www.samsongroup.com

2024-01-19 · English

EB 8310-6 EN