EB 8310-5 EN
Translation of original instructions

Type 3271 Pneumatic Actuator

Type 3277 Pneumatic Actuator

Types 3271 and 3277 Pneumatic Actuators
Actuator areas: 175v2, 350v2 and 750v2 cm²

Edition November 2022

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 >Service & Support > 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 8310-5 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 action............................................................................................3-3
Actuator stem extends..................................................................................3-3
Actuator stem retracts...................................................................................3-4
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...................................................................................5-5

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.............................................................................6-3

EB 8310-5 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)...................................................................6-5
Version with handwheel................................................................................6-5
Extending the actuator stem manually............................................................6-5
Retracting the actuator stem manually............................................................6-5

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..................................................................9-6
Conversion work..........................................................................................9-7
Reversing the direction of action (fail-safe action)...........................................9-7
Ordering spare parts and operating supplies...............................................9-11

10

Decommissioning......................................................................................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......................................................................................15-3
Information on the UK sales region..............................................................15-3
EB 8310-5 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 other applications or conditions than 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 andqualified personnel only; the accepted industry codes and practices must be observed.
According to these mounting and operating instructions, trained personnel refers toindividuals who are able to judge the work they are assigned to and recognize possible
hazards due to their specialized training, their knowledge and experience as well as theirknowledge of the applicable standards.

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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, warning 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 8310-5 EN

Safety instructions and measures

Referenced standards, directives and regulations
According to the ignition risk 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 or the Directive 2008 No. 1597 Supply of Machinery(Safety) Regulations 2008.
Referenced documentation
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 8310-5 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 'Relieving the spring compression in
the actuator' in the 'Removal' section.
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 silencers 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' section).
Î Before starting any work on the actuator, relieve the compression from the preloaded springs. See 'Relieving the spring compression in the actuator' in the 'Removal'
section.
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 8310-5 EN

Safety instructions and measures! WARNING
Damage to health relating to the REACH regulation.
If a SAMSON device contains a substance which is listed as being a substance of very
high concern on the candidate list of the REACH regulation, this circumstance is indicated on the SAMSON delivery note.
Î Information on safe use of the part affected
u www.samsongroup.com > About SAMSON > Material Compliance > REACH.
Risk of personal injury through 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 8310-5 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

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).
The lifting eyelet/eyebolt and the swivel hoist mustnot be used 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 through the sudden anduncontrolled projection of parts.
Before starting any work on the actuator, relieve
the compression from the preloaded springs. See'Relieving the spring compression in the actuator'
in the 'Removal' section.

1-6

EB 8310-5 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 Actuator with 175v2, 350v2 or 750v2 cm²actuator area
Item Inscription meaning
2 Type designation
3 Company name
4 Company address (ZIP/postal code and city)
5 Data Matrix code
6 Device designation

Item Inscription meaning
24 Permissible operating pressure pmax
in bar and/or psi
25 Diaphragm material
26 Type of connecting thread
28 Symbol for manual override:

9 Serial number(optional)

10 Material no.

30 Version (optional), e.g. SAM001

12 Country of origin

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

13 Month and year of manufacture
15 Symbol indicating fail-safe action:
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
22 Operating range in bar
23 Operating range in psi

EB 8310-5 EN

2-1

2-2

EB 8310-5 EN

Design and principle of operation

3 Design and principle of operation
The SAMSON Type 3271 and Type 3277
Actuators with 175v2, 350v2 and
750v2 cm² actuator areas 1) are mounted toSeries 240, 250, 280 and 290 Valves(globe valves).

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 theactuator. The bench range is determined by
the number of springs used and theircompression, taking into account the rated
travel. The travel is proportional to the signal
pressure pst. The direction of action of theactuator stem (A7) depends on how thesprings are installed in the actuator.
Several springs may be fitted into one another.
A16

A1
A10

A4

A5

A7
A8

A26/27

A2
S

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

Fig. 3-1: Functional diagram of Type 3271 Actuator (175v2 cm²), "stem extends" direction of action
1)

v2 is added to the actuator area (e.g. 175v2 cm²) to indicate actuators with a full diaphragmEB 8310-5 EN

3-1

Design and principle of operation

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
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 the

A1

S

A4
A5

A2
A10
A16

A7
A8
A26/27

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
S

Stem connector clamp
Signal pressureconnection

Fig. 3-2: Functional diagram of Type 3277 Actuator (750v2 cm²), "stem retracts" direction of action

3-2

EB 8310-5 EN

Design and principle of operation

signal pressure connection on the bottom diaphragm case.
With fail-safe action "actuator stem retracts",
the compressed air is applied to the signal
pressure connection on the top diaphragmcase.
The direction of action can be reversed (seethe 'Service and conversion work' section).

3.4 Signal pressure routing
3.4.1

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).
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.

3.4.2

Type 3277

In the "actuator stem extends" version, a signal pressure connection (S) is located on theside of the yoke which is connected to thebottom diaphragm chamber over an internalhole. The signal pressure moves the actuator
stem upward opposing the spring force. A
positioner can be connected using a connection block at this point. No additional piping

EB 8310-5 EN

to the actuator is required. Refer to the associated positioner documentation for moredetails.
In the "actuator stem retracts" version, similar to Type 3271, the signal pressure is routed 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).

3.5 Fail-safe position
Note
The listed fail-safe actions apply to
SAMSON Series 240, 250, 280 and 290
Valves (globe valves).
When the signal pressure is reduced or thecontrol signal fails, the fail-safe position of
the control valve depends on whether thesprings are installed in the top or bottom diaphragm chamber.
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.

3-3

Design and principle of operation

3.5.2

Actuator stem retracts

When the signal pressure is reduced or thecontrol signal fails, the springs move the actuator 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
Type 3271 and Type 3277 Pneumatic Actuator (175v2, 350v2 and 750v2 cm²):− Standard version
The top and bottom diaphragm cases are
made of plastic-coated sheet steel.
− Corrosion-resistant version
The top and bottom diaphragm cases are
optionally available made of stainlesssteel 1.4301.
− Version with handwheel
The Type 3271 and Type 3277 Actuators
can be fitted with an additional handwheel. The actuator stem position can be
adjusted using the handwheel.
− Version with side-mounted handwheel
The Type 3271 and Type 3277 Actuators
can be combined with a Type 3273
Side-mounted Handwheel with max.
30 mm travel (u T 8312).
− Travel stop
The Type 3271 and Type 3277 Actuators
can be fitted with a mechanically adjustable travel stop in a special version. The
travel is reduced by up to 50 % in both
directions of action (stem extends or retracts).

3-4

3.7 Accessories
Swivel hoist
The pneumatic actuators with 750v2 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.
Actuator area

Eyebolt(DIN 580)

Swivel hoist

750 cm²

8325-0131

8442-1017

Lifting fixture for small actuators
A special lifting tool is available to lift pneumatic actuators with 175v2 and 350v2 cm²actuator 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 07
Feedback connection (travel pick-off interface) according to IEC 60534-6-1
Various valve accessories according toIEC 60534-6-1 and NAMUR recommenda-

EB 8310-5 EN

Design and principle of operation

tion 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

3271

Actuatorarea incm²

Temperature range
The permissible temperature range depends
on the diaphragm material:

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

Attachment
on both sides

1400-6816(included in
175
scope ofdelivery of
the actuator)

100029690

100029695(included inscope ofdelivery of750
the actuator)

1400-5529

350

1)

Diaphragm material

Temperature range

NBR 1)–31 to +194 °F–35 to +90 °C

PVMQ–76 to +194 °F–60 to +90 °C

In on/off service, lowest temperature restricted
to –4 °F (–20 °C).

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' section for restrictions.

175
3277

350 100029695

1400-5529

750

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

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3-5

Design and principle of operation

Table 3-1: Dimensions in mm and weights in kg
Actuator
Actuator
area

Type

3271

3277

cm²

175v2

350v2

750v2

175v2

350v2

750v2

H
H'
Ha

–
78
15

–
92
15

171
139
15

–
78
15

–
82
15

171
139
15

313

319

493

413

419

595

413

419

593

513

519

695

1)

Only with handwheel
H1With handwheel
and travel stop
Only with handwheel
H2
With handwheel
and travel stop
H4ratedFA
H4maxFA
H4maxFE
H5
H6
H7 2)

358

364

543

458

464

643

458

464

643

558

564

743

75
78
78
–
34
–

75
78
85
–
34
–

90
93
98
–
34
65

75
78
78
101
34
–

75
78
85
101
34
–

90
93
98
101
34
65

Travel
stop

H8

75

85

129

75

85

129

Diameter

ØD
ØD1
ØD2

215
180
10

280
250
16

280
250
16

394
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

6
10

11.5
16.5

15
20

40
45

HeightØd (thread)Air connectionaa2
Weight 4)
Without handwheel
With handwheel
1)
2)
3)
4)

3-6

394
215
315
180
16
16
M30x1.5 3)
G 3/8
G¼(3/8 NPT) (¼ NPT)
–
G 3/8
36
41

10
14

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.
175v2 cm² actuator area with connection for Type 3510 Micro-flow Valve: M20x1.5 thread
The specified weight applies to a specific standard device configuration. Weights of other actuatorconfigurations may differ depending on the version (material, number of actuator springs etc.).

EB 8310-5 EN

Design and principle of operation

Dimensional drawings
ØD
Ha
H'

ØD2
Ød

H4

Type 3277 with 750v2 cm² actuator area

H2

H1

a

H6

H4
H6

a2

Ha

H'

H7

a

H5

H

ØD1

a

H8

ØD2
Ød
ØD
Type 3271 (750v2 cm²) with handwheel

Type 3271 with travel stopEB 8310-5 EN

3-7

3-8

EB 8310-5 EN

Shipment and on-site transport

4 Shipment and on-site transport
The work described in this section is only tobe performed 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' section for nameplate details.
2. Check the shipment for transportation
damage. Report any damage to
SAMSON and the forwarding agent(refer to delivery 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' section.

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.

EB 8310-5 ENÎ Leave the actuator in its transport container or on the pallet to transport it onsite.
Î Dispose and recycle the packaging in accordance 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 the packaging, if
applicable).
! NOTICE
Risk of actuator damage due to incorrectly
attached slings.
750v2 cm² actuator: the lifting eyelet/
eyebolt or swivel hoist on the top diaphragmcase is only intended for mounting andremoving the actuator as well as lifting theactuator without the valve. The lifting eyelet/
eyebolt and the swivel hoist must not be used

4-1

Shipment and on-site transport

to vertically lift the entire control valve
assembly.
Î Do not attach load-bearing slings to thehandwheel or travel stop.
Î Observe lifting instructions (see section 4.3.2).
Tip
Our after-sales service can provide more detailed transport and lifting instructions on request.

4.3.1

Transporting theactuator

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).
− Do not damage the corrosion protection(paint, surface coatings). Repair any
damage immediately.
− Protect the actuator against moisture anddirt.
− Observe permissible temperatures (see'Technical data' in the 'Design and principle of operation' section).

4-2

4.3.2

Lifting the actuatorTo mount large actuators onto the valve, use
lifting equipment (e.g. crane or forklift) to lift
it. See 'Accessories' in the 'Design and principle of operation' section 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.

a) Lifting the actuator (without
valve)
1. 750v2 cm² actuator: open the eyebolt
cover by lightly pressing the side clips(see Fig. 4-3 and Fig. 4-4).
2. 750v2 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).

EB 8310-5 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' section).
6. Remove slings after mounting.
750v2 cm² actuator: replace the coveron the eyebolt (see Fig. 4-4 andFig. 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 'Accessories' in the 'Design and principle of operation' section). In contrast to theeyebolt, 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.

EB 8310-5 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) opened

Fig. 4-5: Lifting point on the actuator

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

4-4

EB 8310-5 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 (see'Technical data' in the 'Design and principle of operation' section).

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 regularly checking 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 8310-5 EN

4-5

4-6

EB 8310-5 EN

Installation

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

5.1 Preparation for installation
Before mounting, 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' section
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 8310-5 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 toseizing up after remaining in the same
position for a long time), release any
stored energy in the actuator (e.g. spring
compression). See 'Relieving the spring
compression in the actuator' in the'Removal' section.

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 malfunction due toan 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' section in the associated valve
documentation.

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' section).

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) and the ring nut (A8) from the 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 section 8.
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)and screw them tight.
11. Align the travel indicator scale (84) withthe tip of the stem connector clamp.

5-2

EB 8310-5 EN

Installation

A22

A20

A23
A25
A21
A8
x

A7

84

A26/27

9
10
8
2

2

Valve bonnet

A7

Actuator stem

8

Threaded bushing

A8

Ring nut

9

Stem connector nut

A20

Hex bolt

10

Lock nut

A21

Hex nut

84

Travel indicator
scale

A22

Hex bolt(preloading)A23

Hex bolt(preloading)A26/27 Stem connector
clampsDim. x95 mm

Fig. 5-1: Type 3271 Pneumatic Actuator (175v2 cm²) mounted on a globe valveb) Valve version with antirotation fixture
1. Firmly press the plug together with theplug stem into the seat ring.
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 documenta-

EB 8310-5 ENtion 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.

5-3

Installation

3. Remove the clamps of the stem connector(A26) and the ring nut (A8) from the actuator.
4. Slide the ring nut over the plug stem.
5. Place the actuator onto the valve bonnet(2) and secure it with the ring nut.
6. Connect the signal pressure. See section 8.

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.

2
A8
A7
A8

A26

A7

9

A26

303

9
301

2

303
301

A7

Actuator stem

9

Stem

A8

Ring nut

301

Clamps303

ScrewsA26 Stem connector clamps
2

Valve bonnet

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

5-4

EB 8310-5 EN

Installation

8. Align and fasten the travel indicatorscale as described in the 'Mounting theactuator onto the valve' section in the associated valve documentation.

5.2.2

Pneumatic connection

Determine the lower and upper signal pressure range values before connecting the supply air: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.

− 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 under 'Spring compression' in
the 'Start-up' section.

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.

EB 8310-5 EN

5-5

5-6

EB 8310-5 EN

Start-up

6 Start-up
The work described in this section is only tobe performed 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' section).
Î Only open the actuator following the instructions in this document. See 'Relieving the spring compression in the actuator' in the 'Removal' section.

EB 8310-5 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 'Relieving the spring
compression in the actuator' in the'Removal' section.
! WARNING
Risk of personal injury through 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

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. 5-1 in the 'Installation' section.
By preloading the springs in the actuator, thefollowing can be achieved:− The thrust is increased (only actuatorswith "stem extends")

6-2− 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).
5. Screw the short nuts (A21) with washers(A25) onto the bolts (A20). Observetightening torques.

EB 8310-5 EN

Start-up

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 25 % of their travel orbench range.
Example: Preloading is required for a benchrange of 0.2 to 1 bar. 25 % of this span is
0.2 bar. Therefore, the signal pressure range
is shifted by 0.2 bar to 0.4 to 1.2 bar. The
new lower signal range value is 0.4 bar andthe new upper signal range value 1.2 bar.
Î Write the new signal pressure range of
0.4 to 1.2 bar on the actuator nameplateas the operating range with preloaded
springs.

6.1.3

Adapting the travel
range

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 anoversized actuator (e.g. the rated travel ofthe actuator is larger than the rated travel ofthe valve), only the first half of the actuator's
bench range can be used.
Example: DN 50 valve with 15 mm rated
travel and 750v2 cm² actuator with 30 mm
rated travel; 0.2 to 1 bar bench range:
At half the valve travel, the operating range
is between 0.2 and 0.6 bar.

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.
Example: DN 50 valve with 15 mm rated
travel and 750v2 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

EB 8310-5 EN

6-3

Start-up

6.2 Travel stop
750v2 cm²

See Fig. 6-1
In the version with travel stop, the maximum
and minimum actuator travel can be limited
as follows:
Actuatorarea

Directionof action

Stem ex175v2 cm² tends (FA)
350v2 cm² Stem retracts (FE)

A72
A70
A78

0 to 125

Stem retracts (FE)

0 to 100

0 to 100

6.2.1 Bottom travel stop(minimum travel)

Max. stopin %0 to 85

0 to 125

1. Loosen lock nut (A78) and remove cover(A73).

0 to 85

0 to 100

2. Loosen top lock nut (A70).
3. Move actuator to the required position ofminimum travel.

A73
A50

A70

A73

A78

A50
A75

A7

A7

Actuator stem

0 to 125

Min. stop
in %

A75

A7

Stem extends (FA)A72 Lock nut

A50 Actuator stem

A73 Cover

A70 Lock nut

A75 Top diaphragm case

A78 Lock nut

Fig. 6-1: Type 3271 Actuator with travel stop (left: 175v2 and 350v2 cm² with "stem exends", right:
750v2 cm² with "stem retracts")

6-4

EB 8310-5 EN

Start-up

4. Screw the bottom lock nut (A70) on as
far as it will go and lock this position
with the top lock nut (A70).
5. Attach the cover (A73) and retighten thelock nut (A78).
Note
If the minimum travel is not to be limited,thread the nuts (A70) until they reach the top
end of the actuator stem (A50) and lockthem in position.

6.2.2 Top travel stop (maximum
travel)1. Loosen lock nut (A78) and remove cover(A73).

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

6.3.1

Extending the actuator
stem manually

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).

2. Move actuator to the required position of
maximum travel.

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

3. Screw back on the cover (A73) as far it
will go and retighten the lock nut (A78).

6.3.2

6.3 Version with handwheel
See Fig. 6-2
The stem connector (51) connects the actuator stem (A7) with the actuator stem (A50) of
the handwheel. The actuator stem position
can be adjusted using the handwheel (A60).
In Type 3271 and Type 3277 Pneumatic Actuators with 750v2 cm² actuator area and ahandwheel, the upper bench range value
must not exceed 3.1 bar.

EB 8310-5 EN

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.

6-5

Start-up

A60
A51

A60

A66

A66
A55
A51
A50

A51
A50

A55

A50 Actuator stem
(handwheel)

A55 Pointer

A51 Stem connector

A66 Lock nut

A60 Handwheel

Fig. 6-2: Type 3271 Actuator with handwheel (left: 175v2 and 350v2 cm², right: 750v2 cm²)

6-6

EB 8310-5 EN

Operation

7 Operation
The work described in this section 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 'Relieving the spring compression in the actuator' in the 'Removal'
section.

EB 8310-5 EN! 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 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 or on/off 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 175v2, 350v2 and
750v2 cm² actuator areas must not exceed
6 bar in throttling service.
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.

7.2 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.

7-1

Operation

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 750v2 cm² actuator area and ahandwheel, the upper bench range value
must not exceed 3.1 bar.

7.3 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' section).
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' section).

7-2

EB 8310-5 ENMalfunctions

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

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 'Relieving
the spring compression in the actuator' in the'Removal' section.

Insufficient signal pressure

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

Signal pressure notconnected to the correct diaphragm chamber.

See 'Signal pressure routing' in the 'Design andprinciple of operation' section.

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

Travel stop active

See 'Adjusting the travel stop' in the 'Start-up'
section.

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 8310-5 EN

8-1

Malfunctions

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

8-2

EB 8310-5 EN

Servicing and conversion

9 Servicing and conversion
The work described in this section is only tobe performed 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' section).
Î Only open the actuator following the
instructions in this document. See'Relieving the spring compression in theactuator' in the 'Removal' section.

EB 8310-5 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 'Relieving the spring
compression in the actuator' in the'Removal' section.
! WARNING
Risk of personal injury through 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 if service or repair work not described in these
instructions is performed without prioragreement by SAMSON's After-sales Service.
− Only use original spare parts supplied 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' section).
3. Remove the actuator from the valve (seethe 'Removal' section).

EB 8310-5 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'
section). Afterwards, the signal pressuremust be removed and the air supply disconnected again and locked.
4. Relieve the compression from the preloaded springs. See 'Relieving the spring
compression in the actuator' in the 'Removal' section.
5. Unthread and remove the nuts and bolts(including the washers) from around theactuator casing.
The following service and/or conversion
work can be performed after preparation iscompleted:− Replace the diaphragm (see section 9.4.1)− Replace the actuator stem seals (see section 9.4.2)− Reverse the direction of action (see section 9.5.1)

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

EB 8310-5 EN

9.4 Service work
See Fig. 3-1 and Fig. 3-2 in the 'Design andprinciple of operation' section

9.4.1

Replacing the diaphragma) 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 actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)out of 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. Unscrew and remove the nut (A33).
5. Remove the parts from the actuator stem
(A7) in the specified order:−−−−

Spacer (A36)
O-ring (A17)
Diaphragm plate (A5)Diaphragm (A4)

6. Place the parts on the actuator stem inthe specified order:−−−−

New diaphragm (A4)
Diaphragm plate (A5)O-ring (A17)Spacer (A36)9-3Servicing and conversion

Make sure that the seal lip of the new diaphragm (A4) is inserted correctly between compressor (A35) and diaphragmplate (A5).
To prevent the O-ring from being damaged, use a suitable tool to slide theO-ring onto the actuator stem and to position it correctly.
7. Screw the nut (A33) against the compressor (A35). On tightening against theglued hex nut (with 175v2 cm² and
350v2 cm²) or onto the slotted nut (with
750v2 cm²), use a suitable tool to hold it
stationary. Observe tightening torques.
Make sure that the diaphragm does notturn.

phragm plate (A5) and diaphragm (A4)
into the bottom diaphragm case (A2).
10. Place the springs (A10) in the diaphragmplate (A5), centering them in the intended recesses.
11. Place on the top diaphragm case (A1).
Ensure that the compressed air connections on the cases (A1, A2) are correctlyaligned with each other.
12. If necessary, preload the springs (see the'Start-up' section).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

8. Apply a suitable lubricant to the actuator
stem (A7).

b) Actuator stem retracts

9. Place the diaphragm plate assembly consisting of the actuator stem (A7), dia-

See Fig. 9-2

A33

1. Lift off the top diaphragm case (A1).
A33

A36

A36

A17

A35
A34

A35

A7

A9

A5

A7

A17 A5

A4

A4

A4

Diaphragm

A9

Nut

A34

Slotted nut

A5

Diaphragm plate

A17

O-ring

A35

Compressor

A7

Actuator stem

A33

Nut

A36

SpacerFig. 9-1: Arrangement of parts for "stem extends" direction of action (left: 175v2 and 350v2 cm²;
right: 750v2 cm²)

9-4

EB 8310-5 EN

Servicing and conversion

2. Pull the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)out of 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. Unscrew and remove the nut (A33).
5. Take the compressor (A35) and diaphragm (A4) off the diaphragm plate(A5).
6. Place the new diaphragm in the diaphragm plate (A5). Make sure that theseal lip of the diaphragm (A4) is inserted
correctly between compressor (A35) anddiaphragm plate (A5).
7. Screw the compressor (A35) onto the actuator stem (A7).

8. Screw the nut (A33) against the compressor (A35). On tightening against theglued hex nut (with 175v2 cm² and
350v2 cm²) or onto the slotted nut (with
750v2 cm²), use a suitable tool to hold it
stationary. Observe tightening torques.
Make sure that the diaphragm does not
turn.
9. Check whether the springs (A10) rest
correctly in the bottom diaphragm case(A2).
10. Apply a suitable lubricant to the actuator
stem (A7).
11. Place the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)
into the bottom diaphragm case (A2).
Make sure that the sealing elements are
not damaged.
12. Place on the top diaphragm case (A1).
Ensure that the compressed air connecA33
A5

A33
A35
A17

A35
A17 A34 A7

A36

A9

A5

A7

A36

A4

A4

A4

Diaphragm

A9

Nut

A34

Slotted nut

A5

Diaphragm plate

A17

O-ring

A35

Compressor

A7

Actuator stem

A33

Nut

A36

SpacerFig. 9-2: Arrangement of parts for "stem retracts" direction of action (left: 175v2 and 350v2 cm²;
right: 750v2 cm²)

EB 8310-5 EN

9-5

Servicing and conversion

tions on the cases (A1, A2) are correctlyaligned with each other.

phragm plate (A5) and diaphragm (A4)
into the bottom diaphragm case (A2).

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

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

9.4.2

Replacing the actuator
stem sealsa) Actuator stem extends
1. Lift off the top diaphragm case (A1) andremove springs (A10).
2. Pull the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)out of 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.
6. Use a suitable tool to mount the radial
shaft seal. Observe the correct alignmentof the radial shaft seal (see Fig. 9-3).
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 actuator stem (A7), dia-

9-6

11. Place on the top diaphragm case (A1).
Ensure that the compressed air connections on the cases (A1, A2) are correctlyaligned with each other.
12. If necessary, preload the springs (see the'Start-up' section).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.
Radial shaft seal

Seal lip

Wiper ring
Fig. 9-3: Aligning the radial shaft and seal
wiper ringb) Actuator stem retracts
1. Lift off the top diaphragm case (A1).
2. Pull the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)out of the bottom diaphragm case (A2).
3. Use a suitable punch to remove the radial shaft seal (A40).

EB 8310-5 EN

Servicing and conversion

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.
6. Use a suitable tool to mount the radial
shaft seal. Observe the correct alignmentof the radial shaft seal (see Fig. 9-3).
7. Fill the cavity of the radial shaft seal, in
which the spring is seated, with lubricant.

9.5.1

Reversing the directionof action (fail-safe
action)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:
Actuator stem extends

8. Apply a suitable lubricant to the actuator
stem (A7).
9. Place the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)
into the bottom diaphragm case (A2).
Make sure that the sealing elements are
not damaged.
10. Place on the top diaphragm case (A1).
Ensure that the compressed air connections on the cases (A1, A2) are correctlyaligned with each other.
11. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

9.5 Conversion work
See Fig. 3-1 and Fig. 3-2 in the 'Design andprinciple of operation' section

Actuator stem retractsa) Reversal of the direction ofaction from stem extends tostem retracts
See Fig. 9-4
1. Lift off the top diaphragm case (A1) andremove springs (A10).
2. Pull the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)out of 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. Unscrew and remove the nut (A33).
5. Remove the parts from the actuator stem
(A7) in the specified order:−−−−

EB 8310-5 EN

Spacer (A36)
O-ring (A17)
Diaphragm plate (A5)Diaphragm (A4)9-7Servicing and conversion− Compressor (A35)
6. Place the parts on the actuator stem in
the reverse order as follows:
−
−
−
−
−

Spacer (A36)
O-ring (A17)
Diaphragm plate (A5)Diaphragm (A4)Compressor (A35)

Make sure that the seal lip of the diaphragm (A4) is inserted correctly between compressor (A35) and diaphragmplate (A5).
To prevent the O-ring from being damaged, use a suitable tool to slide theO-ring onto the actuator stem and to position it correctly.
7. Screw the nut (A33) against the compressor (A35). On tightening against theglued hex nut (with 175v2 cm² and
350v2 cm²) or onto the slotted nut (with
750v2 cm²), use a suitable tool to hold it
stationary. Observe tightening torques.
Make sure that the diaphragm does notturn.
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 consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)with the actuator stem pointing upward
into the diaphragm case (A1).

9-8

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.
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.
14. Type 3271: remove the vent plug (A16)from the top signal pressure connection(S) and screw it onto the bottom connection.
Type 3277: remove the vent plug (A16).
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.

EB 8310-5 EN

Servicing and conversion

A33
A5

A33
A35
A17

A35
A17 A34 A7

A36

A9

A5

A7

A36

A4

A4

A4

Diaphragm

A9

Nut

A34

Slotted nut

A5

Diaphragm plate

A17

O-ring

A35

Compressor

A7

Actuator stem

A33

Nut

A36

SpacerFig. 9-4: Arrangement of parts for "stem retracts" direction of action (left: 175v2 and 350v2 cm²;
right: 750v2 cm²)b) Reversal of the direction ofaction from stem retracts tostem extends
See Fig. 9-5
1. Lift off the top diaphragm case (A1).
2. Pull the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)out of the bottom diaphragm case (A2).
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.
5. Unscrew and remove the nut (A33).
6. Remove the parts from the actuator stem
(A7) in the specified order:

EB 8310-5 EN

−
−
−
−
−

Compressor (A35)
Diaphragm (A4)
Diaphragm plate (A5)O-ring (A17)Spacer (A36)

7. Place the parts on the actuator stem in
the reverse order as follows:
−
−
−
−
−

Compressor (A35)
Diaphragm (A4)
Diaphragm plate (A5)O-ring (A17)Spacer (A36)

Make sure that the seal lip of the diaphragm (A4) is inserted correctly between compressor (A35) and diaphragmplate (A5).
To prevent the O-ring from being damaged, use a suitable tool to slide theO-ring onto the actuator stem and to position it correctly.

9-9Servicing and conversion

8. Screw the nut (A33) against the compressor (A35). On tightening against theglued hex nut (with 175v2 cm² and
350v2 cm²) or onto the slotted nut (with
750v2 cm²), use a suitable tool to hold it
stationary. Observe tightening torques.
Make sure that the diaphragm does notturn.
9. Apply a suitable lubricant to the actuator
stem (A7).
10. Place the diaphragm plate assembly consisting of the actuator stem (A7), diaphragm plate (A5) and diaphragm (A4)
into the bottom diaphragm case (A2).
11. Place the springs (A10) in the diaphragmplate (A5), centering them in the intended recesses.
12. Place on the top diaphragm case (A1).
Ensure that the compressed air connections on the cases (A1, A2) are correctlyaligned with each other.
A33

13. If necessary, preload the springs (see the'Start-up' section).
14. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.
15. Type 3271: remove the vent plug (A16)from the bottom signal pressure connection (S) and screw it onto the top connection.
Type 3277: remove the vent plug (A16).
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 (over the yoke inType 3277). As a result, the actuator
stem retracts opposing the spring force
as the signal pressure increases.

A33

A36

A36

A17

A35
A34

A35

A7

A9

A5

A7

A17 A5

A4

A4

A4

Diaphragm

A9

Nut

A34

Slotted nut

A5

Diaphragm plate

A17

O-ring

A35

Compressor

A7

Actuator stem

A33

Nut

A36

SpacerFig. 9-5: Arrangement of parts for "stem extends" direction of action (left: 175v2 and 350v2 cm²;
right: 750v2 cm²)

9-10

EB 8310-5 EN

Servicing and conversion

16. Affix a new nameplate with changed
symbol and new configuration ID to theactuator.

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 8310-5 EN

9-11

9-12

EB 8310-5 EN

Decommissioning

10 Decommissioning
The work described in this section is only tobe performed 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' section).
Î Only open the actuator following the instructions in this document. See 'Relieving the spring compression in the actuator' in the 'Removal' section.

! 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 'Relieving the spring
compression in the actuator' in the'Removal' section.
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 8310-5 EN

10-1

10-2

EB 8310-5 EN

Removal

11 Removal
The work described in this section is only tobe performed 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' section).
Î Only open the actuator following the
instructions in this document. See'Relieving the spring compression in theactuator' in the 'Removal' section.

EB 8310-5 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 'Relieving the spring
compression in the actuator' in the'Removal' section.
Before removing the valve, make sure the following conditions are met:
− The actuator is put out of operation (seethe 'Decommissioning' section).

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 8310-5 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 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& Support > 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 &Support > After-sales Service.

1. Exceptions apply concerning somespecial device models
u www.samsongroup.com > Service &Support > After-sales Service.
2. Send an e-mailu retouren@samsongroup.com toregister the return shipment including thefollowing information:− Type− Article no.
− Configuration ID− Original order

EB 8310-5 EN

12-1

12-2

EB 8310-5 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 8310-5 EN

13-1

13-2

EB 8310-5 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 175v2,
350v2 and 750v cm² actuator areas isprovided on the next page.
The certificates shown were up to date at thetime of publishing. The latest certificates canbe found on our website:− u www.samsongroup.com > Products &Applications > Product selector >Actuators > 3271
− u www.samsongroup.com > Products &Applications > Product selector >Actuators > 3277
Other optional certificates are available on
request.

EB 8310-5 EN

14-1

14-2

EB 8310-5 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 8310-5 EN

Page 1 of 1

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EB 8310-5 EN

Annex15 Annex
15.1 Tightening torques, lubricants and toolsu AB 0100 for tools, tightening torques and lubricants

15.2 Spare parts
1

Top diaphragm case50

Spindle2

Bottom diaphragm case

51

Stem connector

4Diaphragm

52

Cover

5

Diaphragm plate

54

Ring

7

Actuator stem

57

Coupling nut

8Ring nut

58

Sliding washer

9

Nut

59

Flange10

Spring (external)

60

Handwheel

11

Spring (internal)

62

Dowel pin

12

Spring (internal)

63

Threaded pin

16Vent plug64

Cap screw

17

O-ring65

Hex bolt

20

Hex bolt

66

Hex nut

21

Hex nut

67

Snap ring22

Hex bolt (preloading)68

Axial needle seal

23

Hex nut (preloading)69

Washer25

Washer70

Hex nut (lock nut) 1)

27

Stem connector clamp

73

Cover 1)

29

Hex screw75

Top diaphragm case 1)

32

Hanger76

Radial shaft seal 1)

33

Nut

77

Dry bearing 1)

34

Nut

78

Lock nut 1)

35

Compressor

100

Nameplate36

Spacer101

Label (preloading)40

Radial shaft seal

140

Ring bolt

41

Wiper ring160*

Dust shield (option)

42

Dry bearing

300

Stopper47

Hex screw

310

Eyebolt cover48

Follower clamp

1) 2)

1)
2)

EB 8310-5 EN

Only for version with travel stop
Not shown

15-1

47
48
60
66
52

310

73
70
70
78

140
12

20 22 101
140
310
16
1

11

10

101
33
100
36

5

17

4

51

16
75
100
77
76

7

58
68
67
59
64
65
310
140
1

34
36

54
62

17

50

9/34

35
40
42

57
63
69
58
68
8

9/34
7

34
36
17
7

2
42
41
8
160*

300

27
300

29

25
21
23

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EB 8310-5 EN

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:− Order number and position number inthe order− Type, model number, actuator area,
travel, direction of action and benchrange (e.g. 0.2 to 1 bar) or theoperating range of the actuator− Type designation of mounted valve (ifapplicable)− Installation drawing

EB 8310-5 EN

15.4 Information on the UK
sales region
The following information corresponds to the2016 Regulations No.1105 Pressure
Equipment (Safety) Regulations 2016,
STATUTORY INSTRUMENTS, 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

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EB 8310-5 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

2023-07-14 · English

EB 8310-5 EN