EB 8310-4 EN
Translation of original instructions

Type 3277 Pneumatic Actuator

Types 3271 and 3277 Pneumatic Actuators
Actuator area: 355v2 cm²

Edition November 2023

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 8310-4 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........................................................................................3-3Signal pressure routing.................................................................................3-3
Type 3271...................................................................................................3-3
Type 3277...................................................................................................3-3
Fail-safe action............................................................................................3-3
Actuator stem extends..................................................................................3-4
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......................................................................................4-2

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
Connecting the air supply.............................................................................5-6

6
6.1
6.1.1
6.1.2
6.1.3

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

EB 8310-4 EN

Contents

6.2
6.2.1
6.2.2
6.3
6.3.1
6.3.2

Travel stop...................................................................................................6-4
Bottom travel stop (minimum travel)...............................................................6-4
Top travel stop (maximum travel)...................................................................6-4
Version with handwheel................................................................................6-5
Extending the actuator stem manually............................................................6-5
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 servicing or conversion work.............9-3
Service work...............................................................................................9-3
Replacing the diaphragm.............................................................................9-3
Replacing the actuator stem seals..................................................................9-5
Conversion work..........................................................................................9-6
Reversing the direction of action (fail-safe action)...........................................9-6
Ordering spare parts and operating supplies.................................................9-9

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......................................................................................15-4
Information on the UK sales region..............................................................15-4
EB 8310-4 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.

EB 8310-4 EN

1-1

Safety instructions and measures

Personal protective equipment
We recommend wearing the following personal protective equipment when handling theType 3271 and Type 3277 Pneumatic Actuators:− Protective gloves and safety footwear when mounting or removing the actuator− Eye protection and hearing protection while the actuator is operating.
Î Check with the plant operator for details on further protective equipment.
Revisions and other modifications
Revisions, conversions or other modifications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example. Furthermore, the product may no longer meet the requirements for its intended use.
Safety devices
The Type 3271 and Type 3277 Actuators do not have any special safety equipment.
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the actuator by the signal pressure, stored springenergy or moving parts by taking appropriate precautions. Plant operators and operating
personnel must observe all hazard statements, 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 8310-4 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 8310-4 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 holes are not located at eye level andthe 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 8310-4 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, seeu 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 8310-4 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 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 8310-4 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 355v2 cm² actuator 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 8310-4 EN

2-1

2-2

EB 8310-4 EN

Design and principle of operation

3 Design and principle of operation
The SAMSON Type 3271 and Type 3277
Actuators with 355v2 cm² actuator area 1)
are mounted to Series 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).

Actuator stem extends
A16

The signal pressure pst creates the force F =pst · A at the diaphragm surface A which is
opposed by the springs (A10) in the actuator. The bench range is determined by the
number of springs used and their compression, taking into account the rated travel. The
travel is proportional to the signal pressure
pst. The direction of action of the actuator
stem (A7) depends on how the springs are
installed in the actuator.

Actuator stem retracts
A10

A1

S

A5
A4

A2
S
A8

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

A16 S

Signal pressureconnection

A7
A26/27

Fig. 3-1: Functional diagram of Type 3271
1)

v2 is added to the actuator area (e.g. 175v2 cm²) to indicate actuators with a full diaphragmEB 8310-4 EN

3-1

Design and principle of operation

Several springs may be fitted into one another.
The stem connector clamps (A26/27)
connect the actuator stem (A7) with the plug
stem of the globe valve.

Actuator stem extends
A16

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 pick-

Actuator stem retracts
A10

A1

S

A4

A5
S

A2

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

A16

A8
A7
A26/27

Fig. 3-2: Functional diagram of Type 3277

3-2

EB 8310-4 EN

Design and principle of operation

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

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

EB 8310-4 ENstem (A7) downward opposing the springforce (see Fig. 3-1, right).

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 internal
hole (see Fig. 3-2, left side). The signal pressure moves the actuator stem upward opposing the spring force. A positioner can beconnected using a connection block at thispoint. No additional piping to the actuator isrequired. Refer to the associated positioner
documentation for more details.
In the "actuator stem retracts" version, similar to Type 3271, the signal pressure is 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, right).

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 neu-

3-3

Design and principle of operation

tral position), the valve is not moved to thefail-safe position even upon failure of the
supply air.

3.5.1

Actuator stem extends

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

3.5.2

Actuator stem retracts

When the signal pressure is reduced or thecontrol signal fails, the springs move the 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 3271/355v2 cm² andType 3277/355v2 cm² Pneumatic Actuators:− Standard version
The top and bottom diaphragm cases are
made of plastic-coated sheet steel.
− 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.
−

3-4− 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).

3.7 Accessories
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
Lifting fixture
A special lifting tool is available to lift pneumatic actuators with 355v2 cm² actuator area (u AB 0100).
Feedback connection (travel pick-off interface) according to IEC 60534-6-1
Various valve accessories according toIEC 60534-6-1 and NAMUR recommendation can be mounted on SAMSON control
valves designed according to the modular
principle. See associated valve documentation. The travel pick-off interface for thesemounted devices can be ordered (accessories):

EB 8310-4 EN

Design and principle of operation

Accessories forType ...
Actuator

Attachment
on one side Attachment(material
on both sides
number)(item number)

Actuatorarea in
cm²

3271

355

100029695(included inscope of delivery of theactuator)

3277

355

100029695

1400-5529

1400-5529

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.

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

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).

EB 8310-4 EN

3-5

Design and principle of operation

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

Type

Actuator area

cm²

HeightTravel stop
Diameter

121

Ha

15

15

H4ratedFA

90

90

H4maxFA

93

93

H4maxFE

96

96

H5

–

101

H8

115

115

ØD

280

280

ØD2

a/a1

3-6

16

16

M30x1.5

M30x1.5

G 3/8
NPT

3/8

G 3/8
NPT

3/8

–

G 3/8

15

19

1)

Without handwheel
1)

355v2
131

a2
Weight3277

H'

Ød (thread)Air connection

3271

The weights specified apply to a specific standard device configuration. Weights of other actuatorconfigurations may differ depending on the version (material, number of actuator springs etc.).

EB 8310-4 EN

Design and principle of operation

Dimensional drawings
Ha

ØD
ØD

a1

H5

H'

H'

Ha

a

a2
H4

H4

a

ØD2
Ød

ØD2
Ød
Type 3277

H8Type 3271

Type 3271 with travel stopEB 8310-4 EN

3-7

3-8

EB 8310-4 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 8310-4 EN

Î 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.
Î Do not attach load-bearing slings to thehandwheel or travel stop.
Î Observe lifting instructions (see section 4.3.2).

4-1

Shipment and on-site transport

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.

Î See associated valve documentation for
instructions on how to lift the entire control valve assembly.

4.4 Storing the actuator! NOTICE
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.

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).

4.3.2

Lifting the actuator

Due to the low service weight, lifting equipment is not required to lift the actuator (e.g.
to mount it onto a valve). If lifting equipment(e.g. crane or forklift) is to be used, we havea gripping device available for the actuator(see 'Accessories' in the 'Design and principle of operation' section).

4-2

Note
We recommend regularly checking the actuator and the prevailing storage conditions
during long storage times.
Storage instructions− When the valve and actuator are already assembled, observe the storage
conditions for control valves. See associated 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 less

EB 8310-4 EN

Shipment and on-site transport

than 75 %. In damp spaces, prevent condensation. If necessary, use a drying
agent or heating.
− Make sure that the ambient air is free ofacids or other corrosive media.
− Observe permissible temperatures (see'Technical data' in the 'Design and principle of operation' section).
− 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.
− We recommend a storage temperature of
15 °C for elastomers.
− Store elastomers away from lubricants,
chemicals, solutions and fuels.
Tip
Our after-sales service can provide more detailed storage instructions on request.

EB 8310-4 EN

4-3

4-4

EB 8310-4 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 installation, make sure the following
conditions are met:
− The actuator is not damaged.
− The type designation, material and temperature range of the actuator match theambient conditions (temperatures etc.).
See the 'Markings on the device' 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 8310-4 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 ventholes are not located at eye level in thework position of the control valve and theactuator does not vent at eye level in thework 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 anti-rotation 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 5.2.2.
8. Screw on the stem connector nut (9) byhand until it touches the actuator stem
(A7).
9. Turn the stem connector nut a further
quarter turn and secure this position withthe lock nut (10).
10. Position the stem connector clamps (A26)and screw them tight.
11. Align the travel indicator scale (84) withthe tip of the stem connector clamp.

5-2

EB 8310-4 EN

Installation

A20

A22
A25

A21

A23

A8

2

A7

84

A26/27910
8

2

Bonnet/flange

A20

Hex bolt

8

Threaded bushing

A21

Hex nut

9

Stem connector nut

A22

Hex bolt (preloading)

10

Lock nut

A23

Hex nut (preloading)84

Travel indicator scale

A25

WasherA7

Actuator stem

A8

Ring nut

A26/27

Stem connector clamp

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

EB 8310-4 EN

5-3

Installationb) Valve version with anti-rotation fixture

actuator onto the valve' section in the associated valve documentation.

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 documentation up to the point where the actuator is
to be mounted.
Anti-rotation fixture already mounted
onto the valve:
Slightly loosen the screws (303) and turnthe stem (9) inside the stem connector
clamps (301) by a few turns to move it
downward.
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 5.2.2.
7. Continue following the instructions described under 'Mounting the external anti-rotation fixture' in the associated valve
documentation from the point where thestem (9) is threaded upwards until thehead of the stem rests on the extended
actuator stem.
8. Align and fasten the travel indicatorscale as described in the 'Mounting the

5-4

EB 8310-4 EN

Installation

2
A8
A7
A8

A26

A7

9

A26

303

9
301

2

303
301

A7

Actuator stem

2

Valve bonnet

A8

Ring nut

9

Stem

301

Clamps303

ScrewsA26 Stem connector clamps

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

EB 8310-4 EN

5-5

Installation

5.2.2

Connecting the air
supplyDetermine the lower and upper signal pressure range values before connecting the supply air:− The lower signal pressure range value isthe same as the minimum value of thebench range or operating range (withpreloaded springs).
− The upper signal pressure range value isthe same as the maximum value of thebench range or operating range (withpreloaded springs).
− For actuator springs that are to be preloaded subsequently, determine the upper and lower signal pressure range as
described 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.

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

5-6

EB 8310-4 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 theactuator' in the 'Removal' section.

EB 8310-4 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 theactuator stem by inserting objects into
the yoke.
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.

− In combination with a SAMSON valve:the actuator travel range can be adapted
to a smaller valve travel range

6.1.1

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

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

6-2

EB 8310-4 EN

Start-up

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

6.1.2

Increasing the actuator
thrust

The thrust can only be increased in actuatorswith "stem extends" direction of action. To
achieve this, the springs of the actuators canbe preloaded by up to 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

The signal pressure for half the actuator travel (15 mm) is 1.2 bar. Adding it to the lower
signal pressure range value of 0.4 bar results in a signal pressure of 1.6 bar required
for spring compression. The new lower signal range value is 1.6 bar and the new upper signal range value 2.4 bar.
Î Write the new signal pressure range of
1.6 to 2.4 bar on the actuator nameplateas the operating range with preloaded
springs.
Direction of action: actuator stem retracts
The springs of actuators with "stem retracts"
action cannot be preloaded. When a SAMSON valve is combined with an oversizedactuator (e.g. the rated travel of the actuatoris larger than the rated travel of the valve),
only the first half of the actuator's benchrange can be used.
Example: DN 50 valve with 15 mm rated
travel and 355v2 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 355v2 cm² actuator with 30 mm
rated travel; 0.4 to 2 bar bench range.

EB 8310-4 EN

6-3

Start-up

6.2 Travel stop

A73

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

Min. stop

Max. stop

Stem extends (FA)

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

0 to 100 %50 to 100 %

6.2.1

A74
A72

A70

A1

Bottom travel stop(minimum travel)

1. Loosen lock nut (A70) and remove cover(A73).
2. Unscrew lock nut (A74) and turn the adjustment nut (A72) to adjust the travelstop.
3. Tighten lock nut (A74).
4. Attach the cover (A73) and retighten thelock nut (A70).

6.2.2

Top travel stop
(maximum travel)

1. Loosen the lock nut (A70).
2. Adjust the cover (A73) to the required
travel stop.

A5
A7
Left half:
Right half:

Actuator stem retracts (FE)Actuator stem extends (FA)A1 Top diaphragm case
A5 Diaphragm plate
A7 Actuator stem
A70 Lock nut
A72 Adjustment nut
A73 Cover
A74 Lock nut

Fig. 6-1: Travel stop

3. Retighten lock nut (A70).

6-4

EB 8310-4 EN

Start-up

6.3 Version with handwheel
See Fig. 6-2
An overrun mechanism links the handwheel
and actuator stem. The actuator stem position can be adjusted using the handwheel.
Note
Contact our after-sales service to retrofit anactuator with a handwheel.

6.3.1

Extending the actuator
stem manually

3. Retract the actuator stem up to the required position.
To change from manual to automatic operation, put the handwheel into the neutral position by aligning the pointer withthe groove on the stem connector.
4. Tighten the lock nut to lock the handwheel.

Lock nut

Groove/marking on
the stem connector

1. Loosen the lock nut to unlock the handwheel.
2. Turn the handwheel clockwise until thebottom stop position of the overrun
mechanism is overcome.
3. Extend the actuator stem up to the required position.

Pointer

To change from manual to automatic operation, put the handwheel into the neutral position by aligning the pointer withthe groove on the stem connector.
4. Tighten the lock nut to lock the handwheel.

6.3.2

Retracting the actuator
stem manually

1. Loosen the lock nut to unlock the handwheel.
2. Turn the handwheel counterclockwise until the top stop position of the overrun
mechanism is overcome.

EB 8310-4 EN

Fig. 6-2: Type 3271 Actuator with handwheel

6-5

Start-up

6-6

EB 8310-4 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 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.

EB 8310-4 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, forexample, to the configuration ID or thesymbol after reversal of the direction ofaction.
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 355v2 cm² actuator area
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.

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 in the 'Design and principle ofoperation' 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 8310-4 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 not
See 'Signal pressure routing' in the 'Design andconnected to the correct principle of operation' section.
diaphragm chamber.

Actuator stem does not
stroke through its complete travel range.

Diaphragm in theactuator defective

See 'Replacing the diaphragm' in the 'Servicing'
section.

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 8310-4 EN

8-1

Malfunctions

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

8-2

EB 8310-4 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 necessary
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 8310-4 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 theactuator stem by inserting objects into
the yoke.
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, forexample, to the configuration ID or thesymbol after reversal of the direction ofaction.
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.

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

! NOTICE

9.1 Periodic testing

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

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 8310-4 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 servicing 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 servicing or
conversion work
1. Mount the actuator (see the 'Installation'section).
2. Adjust the upper or lower bench range
values (see the 'Start-up' section).

EB 8310-4 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 actuator stem (A7) together withthe diaphragm plate (A5) and diaphragm (A4) out of the bottom diaphragm case (A2).
3. Clamp the actuator stem (A7) into a viseusing protective jaws. Make sure that theactuator stem is not damaged.
4. Unscrew the collar nut (A15).
5. Take the diaphragm plate (A5) and thediaphragm (A4) off the actuator stem
(A7).
6. Place the new diaphragm in the diaphragm plate (A5) and put them on theactuator stem. Make sure that the seal lipof the diaphragm (A4) is inserted correctly between compressor (A35) and diaphragm plate (A5).
7. Check the sealing element of the collar
nut (A15). If necessary, renew it (orderno. 8353-0539).

9-3

Servicing and conversion

8. Screw the collar nut (A15) on the actuator stem (A7). Observe tightening
torques.

A15

A5

9. Apply a suitable sealant and lubricant tothe actuator stem (A7).
10. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and diaphragm (A4) into the bottom diaphragmcase (A2).

A4

11. Place the springs (A10) into the bottom
diaphragm case, centering them in theintended recesses.

A7

12. Place on the top diaphragm case (A1).
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.

9-4

A35

A4

Diaphragm

A15

Collar nut

A5

Diaphragm
plate

A35

Compressor

A7

Actuator stem

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

EB 8310-4 EN

Servicing and conversionb) Actuator stem retracts
See Fig. 9-2
1. Lift off the top diaphragm case (A1).
2. Pull the actuator stem (A7) together withthe diaphragm plate (A5) and diaphragm (A4) out of the bottom diaphragm case (A2).

12. Place on the top diaphragm case (A1).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.
A35

A15

A4

3. Clamp the actuator stem (A7) into a viseusing protective jaws. Make sure that theactuator stem is not damaged.
4. Unscrew the collar nut (A15).

A5

5. Take the compressor (A35) together withthe diaphragm plate (A5) and diaphragm (A4) off the actuator stem (A7).

A37

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. Check the sealing element of the collar
nut (A15). If necessary, renew it (orderno. 8353-0539).

A7A4Diaphragm

A15

Collar nut

A5

Diaphragm
plate

A35

Compressor

A7

Actuator stem

A37

Shim

Fig. 9-2: Arrangement of parts for "stemretracts" direction of action

8. Screw the collar nut (A15) on the actuator stem (A7). Observe tightening
torques.

9.4.2

9. Check whether the springs (A10) rest
correctly in the bottom diaphragm case
(A2).

1. Lift off the top diaphragm case (A1) andremove springs (A10).

10. Apply a suitable sealant and lubricant tothe actuator stem (A7).
11. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and diaphragm (A4) into the bottom diaphragmcase (A2).

EB 8310-4 EN

Replacing the actuator
stem seals

2. Pull the actuator stem (A7) together withthe diaphragm plate (A5) and diaphragm (A4) out of the bottom diaphragm case (A2).
3. Remove the radial shaft seal (A40).
4. Check the dry bearing (A42) and wiper(A41) and renew them, if necessary.

9-5Servicing and conversion

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 sealant and lubricant tothe actuator stem (A7), if necessary.
9. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and diaphragm (A4) into the bottom diaphragmcase (A2).

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

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

10. Place the springs (A10) into the bottom
diaphragm case, centering them in theintended recesses.
11. Place on the top diaphragm case (A1).
12. If necessary, preload the springs (see the'Start-up' 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 ring

9-6

Actuator stem retractsa) Reversal of the direction ofaction from stem extends tostem retracts
Required accessories
For the reversal from "stem extends" to "stemretracts", a shim (37) is additionallyrequired. Contact our after-sales service toorder the shim (item no. 8390-0143).
See Fig. 9-4
1. Lift off the top diaphragm case (A1) andremove springs (A10).
2. Pull the actuator stem (A7) together withthe diaphragm plate (A5) and diaphragm (A4) out of the bottom diaphragm case (A2).

EB 8310-4 EN

Servicing and conversion

3. Clamp the actuator stem (A7) into a viseusing protective jaws. Make sure that theactuator stem is not damaged.

(S) and screw it onto the bottom connection.
Type 3277: remove the vent plug (A16).

4. Unscrew the collar nut (A15).

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.

5. Take the compressor (A35) together withthe diaphragm plate (A5) and diaphragm (A4) off the actuator stem (A7).
6. Place the shim (A37) onto the lock nut(10).
7. Place the diaphragm plate (A5) together
with the diaphragm (A4) and compressor (A35) in reverse order onto the actuator stem (A7). Make sure that the seal
lip of the diaphragm (A4) is inserted correctly between compressor (A35) and diaphragm plate (A5).

15. Affix a new nameplate with changed
symbol and new configuration ID to theactuator.
A35

A15

A4

8. Screw the collar nut (A15) against thecompressor (A35). Observe tightening
torques.
9. Apply a suitable sealant and lubricant tothe actuator stem (A7).

A5

10. Place the springs (A10) in the bottom diaphragm case (A2), centering them in
the intended recesses.
11. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and diaphragm (A4) into the bottom diaphragmcase (A2).
12. Place on the top diaphragm case (A1).
13. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.

A37
A7
A4

Diaphragm

A15

Collar nut

A5

Diaphragm
plate

A35

Compressor

A7

Actuator stem

A37

Shim

Fig. 9-4: Arrangement of parts with shim for"stem retracts" direction of action

14. Type 3271: remove the vent plug (A16)from the top signal pressure connection

EB 8310-4 EN

9-7

Servicing and conversionb) Reversal of the direction ofaction from stem retracts tostem extends

11. Insert the actuator stem (A7) together
with the diaphragm plate (A5) and diaphragm (A4) into the bottom diaphragmcase (A2).

See Fig. 9-5

12. Place the springs (A10) into the bottom
diaphragm case, centering them in theintended recesses.

1. Lift off the top diaphragm case (A1).
2. Pull the actuator stem (A7) together withthe diaphragm plate (A5) and diaphragm (A4) out of the bottom diaphragm case (A2).
3. Remove the springs (A10).
4. Clamp the actuator stem (A7) into a viseusing protective jaws. Make sure that theactuator stem is not damaged.
5. Unscrew the collar nut (A15).
6. Take the compressor (A35) together withthe diaphragm plate (A5) and diaphragm (A4) off the actuator stem (A7).
7. Remove the shim (A37).
The shim is not required for "stem extends" direction of action.
8. Place the diaphragm plate (A5) together
with the diaphragm (A4) and compressor (A35) in reverse order onto the actuator stem (A7). Make sure that the seal
lip of the diaphragm (A4) is inserted correctly between compressor (A35) and diaphragm plate (A5).
9. Screw the collar nut (A15) against thecompressor (A35). Observe tightening
torques.

13. Place on the top diaphragm case (A1).
14. If necessary, preload the springs (see the'Start-up' section).
15. Fasten the top and bottom diaphragmcases (A1, A2) together using the nuts(A21) and bolts (A20). Observe tightening torques.
16. 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.
17. Affix a new nameplate with changed
symbol and new configuration ID to theactuator.

10. Apply a suitable sealant and lubricant tothe actuator stem (A7).

9-8

EB 8310-4 EN

Servicing and conversion

A15

A5

A4
A35
A7
A4

Diaphragm

A15

Collar nut

A5

Diaphragm
plate

A35

Compressor

A7

Actuator stem

Fig. 9-5: Arrangement of parts for "stem extends" direction of action

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 8310-4 EN

9-9

9-10

EB 8310-4 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 theactuator' 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 8310-4 EN

10-1

10-2

EB 8310-4 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 8310-4 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 theactuator stem by inserting objects into
the yoke.
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 on the valve bonnet.
5. Disconnect the signal pressure again.
6. Separate the actuator from the valve by
undoing the ring nut.
7. Fasten the lock nut and stem connector
nut 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 8310-4 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 to register the return shipment including the following information:− Type− Article no.
− Configuration ID− Original order

EB 8310-4 EN

12-1

12-2

EB 8310-4 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 8310-4 EN

13-1

13-2

EB 8310-4 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
355v2 cm² actuator area is provided on thenext 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 8310-4 EN

14-1

14-2

EB 8310-4 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 8310-4 EN

Page 1 of 1

14-3

14-4

EB 8310-4 EN

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

15.2 Spare parts

1)

1

Top diaphragm case50

Actuator stem

2

Bottom diaphragm case

51

Stem connector

4Diaphragm

52

Screwed flange

5

Diaphragm plate

54

Ring

7

Actuator stem

57

Coupling nut

8Ring nut

58

Sliding washer

9

Hex nut

59

Yoke

10

Spring (external)

60

Handwheel

11

Spring (internal)

61

Dowel pin15

Collar nut

62

Dowel pin

16

Vent plug

63

Threaded pin

20

Hex bolt

64

Cap screw

21

Hex nut

66

Hex nut

22

Hex bolt (preloading)67

Snap ring23

Hex nut (preloading)68

Axial needle seal

25

Washer69

Washer27

Stem connector clamp70

Hex nut

29

Hex screw

73

Cover

31

Bracket75

Top diaphragm case

32

Hanger (accessories) 1)

76

Radial shaft seal

35

Compressor

77

Dry bearing

37

Shim

78

Lock nut

40

Radial shaft seal

100

Nameplate41

Wiper ring101

Label (preloading)42

Dry bearing

160*

Dust shield (option)

43

Hex screw

161*

47

Hex screw

Dust shield for hand-operated actuator(option)48

Follower clamp

300

Stopper

Not included in the standard scope of delivery.

EB 8310-4 EN

15-1

47
48

51
58
68
67
51
57
69
58
68
54
62
50
59
55
64

60
66
52

161*
8
20
22
16

65
40

100
1

75

101

40
15
37
9
7

58
68
58
67
57
51
69
58
68
73

58

70
77
78
75

50
15
37
9

76
15
37
9

7

7
11
10

27
31
29

5
4
43

41
42

32
25
21
25
21

15-2

35
40
2

160*
8
23

Type 3271

EB 8310-4 EN

47
48
60

51
58
68
67
51
57
69
58
68
54
62
50
59
55
64

66
52

22
20

161*
8
65
40

58
68
58
67
57
51
69
58

300
75

101
100
15
37
9
7

58

70

16

1

68

73

40

77
78
75
76
15
37
9

50
15
37
9
7

7

11

27
29

10
5
4

43
32
25
21

Type 3277

EB 8310-4 EN

35
9
40
42
2
300
16
42
41
160*
8
25
23
21

15-3

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

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− 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

15-4

EB 8310-4 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

2023-11-21 · English

EB 8310-4 EN