EB 8314-1 EN
Translation of original instructions

Type 3275A Pneumatic Piston Actuator
Actuator area: 314, 380, 490 and 804 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 8314-1 EN

Contents

1
1.1
1.2
1.3
1.4

Safety instructions and measures.................................................................1-1
Notes on possible severe personal injury.......................................................1-4
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

Design and principle of operation................................................................3-1
Fail-safe action............................................................................................3-2
Versions......................................................................................................3-2
Accessories.................................................................................................3-3
Technical data.............................................................................................3-3

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......................................................................................4-4

5
5.1
5.2
5.2.1
5.3

Installation..................................................................................................5-1
Preparation for installation............................................................................5-1
Mounting the device.....................................................................................5-1
Mounting the actuator onto the valve.............................................................5-2
Valve accessories.........................................................................................5-2

6

Start-up......................................................................................................6-1

7
7.1

Operation...................................................................................................7-1
Supply pressure in closed-loop operation.......................................................7-1

8
8.1
8.2

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

9
9.1
9.2
9.3
9.4
9.4.1

Servicing....................................................................................................9-1
Periodic testing............................................................................................9-2
Preparing the valve for service work..............................................................9-2
Mounting the actuator after service work.......................................................9-2
Service work...............................................................................................9-2
Replacing parts subject to wear.....................................................................9-4

EB 8314-1 EN

Contents

9.5
9.6

Leak-testing the actuator...............................................................................9-4
Ordering spare parts and operating supplies.................................................9-4

10

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

11
11.1

Removal...................................................................................................11-1
Removing the actuator from the valve..........................................................11-1

12
12.1

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

13

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

14
14.1
14.2
14.3

Annex......................................................................................................14-1
Tightening torques, lubricants and tools.......................................................14-1
Spare parts...............................................................................................14-1
After-sales service......................................................................................14-3

EB 8314-1 EN

Safety instructions and measures

1 Safety instructions and measures
Intended use
The Type 3275A Pneumatic Piston Actuator is designed for operating a mounted globe valve.
In combination with the valve, the actuator is used to shut off and control the flow of liquids,
gases or vapors in the pipeline. The actuator is mainly used in combination with PSA valves 1)(e.g. SAMSON Type 3241-PSA Valve).
The actuator is designed to operate under exactly defined conditions (e.g. thrust, travel).
Therefore, operators must ensure that the actuator is only used in operating conditions thatmeet the specifications used for sizing the actuator at the ordering stage. In case operators
intend to use the actuator 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 and qualified personnel only; the accepted industry codes and practices must be observed. According
to these mounting and operating instructions, trained personnel refers to individuals who areable to judge the work they are assigned to and recognize possible hazards due to their specialized training, their knowledge and experience as well as their knowledge of the applicable standards.

1)

PSA (Pressure Swing Adsorption)

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1-1

Safety instructions and measures

Personal protective equipment
We recommend wearing the following personal protective equipment when handling theType 3275A Pneumatic Actuator:− 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 features
The Type 3275A Actuator does not have any special safety features.
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 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 8314-1 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).
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.)− u AB 0100 for tools, tightening torques and lubricant

EB 8314-1 EN

1-3

Safety instructions and measures

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.

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 insert hands or finger into the yoke while the air supply is connected to theactuator.
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.
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.
Î Use suitable silencers and vent plugs.
Î Wear eye and hearing protection when working near the actuator.

1-4

EB 8314-1 EN

Safety instructions and measures! WARNING
Exposure to hazardous substances poses a serious risk to health.
Certain lubricants and cleaning agents are classified as hazardous substances. These
substances have a special label and a material safety data sheet (MSDS) issued by the
manufacturer.
Î Make sure that an MSDS is available for any hazardous substance used. If necessary, contact the manufacturer to obtain an MSDS.
Î Inform yourself about the hazardous substances and their correct handling.
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 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 8314-1 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 eyebolt
on the actuator housing.
Only attach load-bearing slings to them to vertically lift the actuator on its own (without the valve).
The eyebolt must not be used to vertically lift theentire control valve assembly.

1-6

EB 8314-1 EN

Markings on the device

2 Markings on the device
2.1 Actuator nameplate
The nameplate is attached to the base. It includes all details required to identify the device:
1 Data Matrix code
2 Serial number
3 Material number
4 Date of manufacture (month and year)
5 Actuator area
6 Connecting thread
7 Rated travel in mm
8 Country of origin
9 Permissible ambient temperature
10 Max. permissible pressure pmax in bar
and psi

3275A

Base

10

Nameplate

5
6

1
S/N:
Mat:

8

2
3

4

6
7

9
pmax

Fig. 2-1: Nameplate of Type 3275A Actuator

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2-1

2-2

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Design and principle of operation

3 Design and principle of operation
The double-acting Type 3275A Pneumatic
Piston Actuator with 314, 380, 490 and804 cm² actuator areas is mainly mounted
on PSA valves (e.g. Type 3241-PSA).
The actuator mainly consists of the cover (4),base (10) and piston (9). The stem connector
clamps connect the actuator's piston stem (7)with the plug stem of the globe valve.

The signal pressure pst creates the force
F = pst · A at the piston surface A, which is
opposed by the corresponding counterpressure. The piston is pressurized with the
supply air over the two connections (S; G 3/8
or G ½).
The actuators with 314, 380 and 490 cm²
actuator areas are fixed to a yoke, which isdesigned to accommodate a pneumatic orelectropneumatic positioner. See Fig. 3-1.

10
6
11
9
4

44

7

4

Cover

6

Cylinder barrel

7

Piston stem

9

Piston

10

Base

11

Linkage44

YokeFig. 3-1: Type 3275A Actuator (314, 380 and 490 cm²)

EB 8314-1 EN

3-1

Design and principle of operation

1
6

11

9

2

7

1

Cover

2

Base

6

Cylinder barrel

7

Piston stem

9

Piston11

LinkageFig. 3-2: Type 3275A Actuator (804 cm²)

The actuator with 804 cm² area does need ayoke (see Fig. 3-2). The valve accessories
are mounted over the NAMUR interface.
Refer to the mounting and operating instructions of the valve accessories to be mounted
for more details on their attachment and theaccessories required.

3.1 Fail-safe action
The double-acting piston actuator has no
springs. A defined final position is notreached when the signal pressure is reducedor the air supply fails.

3-2

3.2 Versions
Type 3275A Pneumatic Piston Actuator with
314, 380, 490 or 804 cm² actuator area:− Standard version
Cover and base are coated with an aluminum alloy (3.3547, anodized).
− Version with side-mounted handwheel
The actuator can be combined with aType 3273 Side-mounted Handwheelwith max. 30 mm travel (u T 8312).
− Special version with auxiliary spring
The actuator can be fitted with an auxiliary spring to move the actuator to a defined end position in the depressurizedstate (e.g. upon supply air failure).

EB 8314-1 EN

Design and principle of operation

3.3 Accessories

3.4 Technical data

The pneumatic actuator has a female threadon the base to allow an eyebolt to be
screwed into it. The eyebolt can be used tovertically lift the actuator and is included in
the scope of delivery. A swivel hoist withsuitable lifting capacity can be retrofitted by
the customer in place the eyebolt. In contrast
to the eyebolt, the swivel hoist may be used
for setting a control valve assembly upright.
However, the eyebolt and the swivel hoist
must not be used to vertically lift the entire
control valve assembly (see the 'Shipment
and on-site transport' section).

The nameplate provides information on theactuator version (see the 'Markings on thedevice' section).
Note
More information is available in Data Sheetu T 8314‑1.

Table 3-1: Technical data
Version

Type

3275A

Actuator area

cm²

314

380

490

804

Supplypressure

Max.

6 bar

6 bar

6 bar

6 bar

Rated travelmm

Max. actuator
travelmm

33

Travel volume

cm³ 471597

Air connection
Max. permissible
leakage (t ≥ 0 °C)
Perm. temperature
range for continuous
operation

EB 8314-1 EN

15

19

G

30

942

3/8

50 cm³/min

15

570

19

30

15

19

30

15

19

30

33

33

722 1140 735

931 1470 1206 1528 2412

G

G½

G½

58 cm³/min

70 cm³/min

3/8

50 cm³/min

33–60 to +80 °C

3-3

Design and principle of operation

Table 3-2: Materials
Material configuration

Standard (aluminum)

Heavy-duty version (steel)Material

Material

Cylinder tube

3.3206, anodized

1.0570, N+OX

Bonnet/bottom section

3.3547, anodized

1.0570, N+OX

Piston3.3547, anodized

1.0570, N+OX

Part

Piston stem

1.4548.4

Connecting rod

A2

Yoke/connection nipple

1.0460/1.0038

Ring bolt

C15/A2

Piston stem guide

PTFE/steel

Piston guide band

PTFE

Seals –60 to +80 °C

VMQ/TT-PU

Table 3-3: Dimensions and weights
Actuator

Type

Actuator area

cm²

3275A
314

380

490

804

D1

mm

268

288

318

405

D2

mm

248

268

298

385

H1 (including
eyebolt)

mm

207

207

207

214

H2

mm

102

102

102

–

H3 (stem retracted)

mm

60

60

60

85

Weight(standard version)

kg

17

20

23

41

Weight(heavy-duty
version)

kg

56

62

68

106

3-4

EB 8314-1 EN

Design and principle of operation

Dimensional drawings
D1

H1

20

G

D1
G

H1
G

Ø 16

H3

54

H3

34

H2

20

G

Ø 22

Ø 30

Ø 60

Type 3275A, version with 314, 380 or 490 cm²

Type 3275A, version with 804 cm²

D1
D2

9

74

4xØ

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3-5

3-6

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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 8314-1 EN

Î Leave the actuator in its packaging ortransport container or on the pallet totransport it on site.
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 injury due to incorrect lifting without
the use of lifting equipment.
Lifting the actuator without the use of lifting
equipment may lead to injuries (back injury
in particular) depending on the weight of theactuator.
Î Observe the occupational health andsafety regulations valid in the country ofuse.
! 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 ca‑
pacity is higher than the weight of theactuator (including the packaging, if ap‑
plicable).

4-1

Shipment and on-site transport! NOTICE
Risk of actuator damage due to incorrectly
attached slings.
The eyebolt on the base is only intended for
mounting and removing the actuator as wellas lifting the actuator without valve. The eye‑bolt must not be used to vertically lift the en‑tire control valve assembly.
Î Observe lifting instructions (see sec‑tion 4.3.2).
Tip
Our after-sales service can provide more de‑tailed transport and lifting instructions on re‑quest.

4.3.1

Transporting the actuator

The actuator can be transported using lifting
equipment (e.g. crane or forklift).
Î Leave the actuator in its packaging ortransport container or on the pallet totransport 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 and
dirt.

4-2

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

4.3.2

Lifting the actuatorTo mount large actuators onto the valve, use
lifting equipment (e.g. crane or forklift) to liftit.
Lifting instructions− Use a hook with safety latch (seeFig. 4-3) 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. Open the eyebolt cover by lightly pressing the side clips (see Fig. 4-1 andFig. 4-2).
2. Attach a sling to the eyebolt of the actuator and to the rigging equipment (e.g.
hook) of the crane or forklift (seeFig. 4-3).

EB 8314-1 EN

Shipment and on-site transport

3. Carefully lift the actuator. Check whether
the lifting equipment and accessories canbear the weight.

5. Mount the actuator onto the valve (seethe 'Installation' section).

4. Move the actuator at an even pace to themounting site.

6. Remove slings after mounting and replace the cover on the eyebolt (seeFig. 4-2 and Fig. 4-1).

Fig. 4-1: Eyebolt cover in place on the eyebolt

Fig. 4-2: Eyebolt cover (with strap) opened

Fig. 4-3: Lifting point on the actuator

EB 8314-1 EN

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

4-3

Shipment and on-site transportb) Lifting the entire control valve
assembly
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.

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.

− 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.
− 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.
Tip
Our after-sales service can provide more de‑tailed storage instructions on request.

Note
We recommend regularly checking the actu‑
ator 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.

4-4

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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 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
must be assembled together on site. Proceed

EB 8314-1 EN

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 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, discon‑nect 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.
! NOTICE
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques when tighten‑
ing actuator components. Excessive tighten‑
ing 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).

5-1

Installation! NOTICE
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON(u AB 0100).

6. Place the actuator onto the valve bonnet
and secure it with the ring nut with atightening torque of 150 Nm.
7. Apply a signal pressure to the actuator toextend the piston stem.
8. Screw on the stem connector nut by hand
until it touches the piston stem.

Note
See associated valve documentation for ad‑
ditional mounting instructions.

9. Turn the stem connector nut a further
quarter turn and secure this position withthe lock nut.

5.2.1

10. Position the clamps of the stem connector
and screw them tight using the followingtightening torque:

Mounting the actuator
onto the valve

See Fig. 5-1
To mount the actuator on the valve, proceed
as follows:
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).
1. Loosen the lock nut and stem connector
nut 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.

Actuator size (cm²)

Tightening torque(Nm)314, 380 and 490

9

804

75±5

11. Align the travel indicator scale with the
tip of the stem connector clamp.

5.3 Valve accessories
Valve accessories are either mounted on theyoke (314, 380 and 490 cm²) or over the
NAMUR interface (804 cm² only).
Refer to the mounting and operating instructions of the valve accessories to be mounted
for more details on their attachment and theaccessories required.

4. Remove the clamps of the stem connector
and the ring nut from the actuator.
5. Slide the ring nut over the plug stem.

5-2

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Installation

Yoke
Piston stem
Ring nut
Stem connector clamps
Travel indicator scale
Stem connector nut
Lock nut
Valve bonnet

Fig. 5-1: Type 3275A Piston Actuator with 314 cm² actuator area mounted on a PSA valve

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5-3

5-4

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Start-up

6 Start-up
See the 'Operation' section

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6-1

6-2

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Operation

7 Operation! 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 en‑ergy.
! 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
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 nolonger be correct.
Î Immediately renew any nameplates orlabels with incorrect or outdated infor‑
mation.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.

7.1 Supply pressure in closedloop operation
The Type 3275A Pneumatic Piston Actuator
is designed for a maximum supply pressureof 6 bar.

! 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, discon‑nect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actu‑
ator stem by inserting objects into theyoke.

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7-1

7-2

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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

Piston 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.

Insufficient signal
pressure

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

Signal pressure notconnected properly.

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

Actuator stem does not
stroke through its
complete travel range.

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

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

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8-1

8-2

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Servicing

9 Servicing
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 en‑ergy.
! 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.

EB 8314-1 EN! 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, discon‑nect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actu‑
ator stem by inserting objects into theyoke.
! 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 nolonger be correct.
Î Immediately renew any nameplates orlabels with incorrect or outdated infor‑
mation.
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 tighten‑
ing actuator components. Excessive tighten‑
ing torques lead to parts wearing out more
quickly. Parts that are not tightened far
enough may loosen.

9-1Servicing

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 actuator damage due to the use of
unsuitable lubricants.
Î Only use lubricants approved by
SAMSON (u AB 0100).
Note− The product warranty becomes void if ser‑vice or repair work not described in these
instructions is performed without prioragreement by SAMSON's After-sales Ser‑vice.
− Only use original spare parts by
SAMSON, which comply with the original
specifications.

9.1 Periodic testing
Depending on the operating conditions,check the actuator at certain intervals to prevent possible failure before it can occur.
Plant operators are responsible for drawing
up an inspection and test plan.

9-2

Tip
Our after-sales service can support you in
drawing up an inspection and test plan foryour plant.

9.2 Preparing the valve forservice 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).
The following service work can be performed after preparation is completed:− Replace parts subject to wear (see section 9.4.1)

9.3 Mounting the actuator after
service work
1. Leak-test the actuator (see section 9.5)
2. Mount the actuator (see the 'Installation'section).

9.4 Service work
See Fig. 9-1

EB 8314-1 EN

Servicing

9
450-1
450-2
6
450-3
450-2
450-4
450-5
450-1
450-6

11
10
11

1 Top cover(804 cm²)
2 Bottom cover(804 cm²)
3 Bushing
4 Cover (314, 380
and 490 cm²)
6 Cylinder barrel
7 Piston stem

4

8 Ring nut
9 Piston

7

450-5
450-6

140

10 Base (314, 380
and 490 cm²)
11 Linkage
12 Washer
13 Screws
140 Ring bolt
450-1 O-ring
450-2 Lip seal
450-3 Piston guide band
450-4 Piston rod seal
450-5 Plain bearing
450-6 Wiper ring

11
1
450-1
6
450-2
450-3
9
12
450-1
13
450-4
2
3
8
450-6
450-5
7

EB 8314-1 EN

Fig. 9-1: Type 3275A · Version with
314/380/490 cm² (top)and 804 cm² (bottom)

9-3Servicing

9.4.1

Replacing parts subject
to wear14. Carefully slide the cover (4) or bottom
cover (2) over the piston rod (7).

2. Pull off the tie rods (12) towards the sidewith the piston rod.

15. Screw the tie rods (12) from side with thepiston rod with the short thread side into
the collar nuts (11) on the cylinder base.
Tighten the collar nuts in a crisscross pattern. Observe tightening torques.

3. Remove the cover (4) or bottom cover(2).

9.5 Leak-testing the actuator

1. Unscrew collar nuts (11) on the cylinderbase.

4. Pull the piston rod (7) and piston (9) fromthe cylinder barrel (6).
5. Separate the cylinder barrel (6) andbase (10) or top cover (1).
6. Use a suitable tool to remove parts subject to wear. Make sure that the facings
are not damaged.
7. Carefully clean the affected places andapply a suitable lubricant to them.

After replacing the parts subject to wear, theactuator must be tested for leakage at thefollowing places:− Connection of cover (4), base (10) andcylinder barrel (6) or connection of top
cover (1), bottom cover (2) and cylinder
barrel (6)− Piston rod seal (450-4)

8. Apply a suitable lubricant to the parts
subject to wear.
9. Mount the parts subject to wear. Make
sure that the parts and facings are notdamaged. If necessary, use an assemblytool.
10. Apply a suitable lubricant evenly to theface in the barrel (6) and piston rod (7).
11. Fill the grease chambers at the lip seal
(450-2) and piston rod seal (450-4) witha suitable grease.
12. Center the barrel (6) on the base (10) or
top cover (1).
13. Insert the piston (9) with piston rod (7)into the cylinder barrel (6). Make surethat the parts subject to wear are notdamaged.

9-4

EB 8314-1 EN

Servicing

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.

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9-5

9-6

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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 en‑ergy.
! 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.

EB 8314-1 EN! 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, discon‑nect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actu‑
ator stem by inserting objects into theyoke.
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.
3. Release any stored energy.

10-1

10-2

EB 8314-1 EN

Removal

11 Removal
The work described in this section is only tobe performed by personnel appropriately
qualified to carry out such tasks.
Before removing the valve, make sure the following conditions are met:
− The actuator is put out of operation (seethe 'Decommissioning' section).

11.1 Removing the actuatorfrom the valve
See Fig. 11-1
1. Remove external piping.
2. Remove the clamps of the stem connector.
3. Unscrew the stem connector nut and locknut from the valve.
4. Unscrew the ring nut on the valve bonnet.
5. Separate the actuator from the valve by
undoing the ring nut.
6. Fasten the lock nut and stem connector
nut on the valve.

EB 8314-1 EN

11-1

Removal

Yoke
Piston stem
Ring nut
Stem connector clamps
Travel indicator scale
Stem connector nut
Lock nut
Valve bonnet

Fig. 11-1: Type 3275A Piston Actuator with 314 cm² actuator area mounted on a PSA valve

11-2

EB 8314-1 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 some special 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

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Disposal

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

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13-2

EB 8314-1 EN

Annex14 Annex
14.1 Tightening torques, lubricants and toolsu AB 0100 for tools, tightening torques and lubricants

14.2 Spare parts
1

Top cover (804 cm²)

2

Bottom cover (804 cm²)450-1O-ring (2x)3Bushing

450-2

Lip seal (2x)4Cover (314, 380 and 490 cm²)

450-3

Piston guide band

6

Cylinder barrel

450-4

Piston rod seal

7

Piston stem

450-5

Plain bearing (2x)8Ring nut

450-6Wiper ring (2x)9

Piston10

Base (314, 380 and 490 cm²)

11

Linkage

12

Washer13

Screws14

Retaining plate

26/27

450

Set of parts subject to wear

Stem connector clamp

29

Screws (stem connector clamp)

44

Yoke

100

Warning label

107

Nameplate

140

Ring bolt

307

Eyebolt cover

EB 8314-1 EN

14-1

Annex

307
140
11
107
100
10
450-1
450-2

307
140
11

12

107
100
1
450-1

450-2

450-2

450-3
9

6

450-3
9

450-1
13
14
450-4
4
44
450-5
450-6
8
7
26/27
29
Type 3275A Actuator (314, 380 and 490 cm²)

14-2

12
450-2
6
13
450-4
3
450-5
450-6
450-1
2
8
7
26
27
29
Type 3275A Actuator (804 cm²)

EB 8314-1 EN

Annex14.3 After-sales service
Contact SAMSON's After-sales Service forsupport concerning service or repair work or
when malfunctions 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 bench range(e.g. 0.2 to 1 bar) or the operating
range of the actuator− Type designation of mounted valve (ifapplicable)− Installation drawing

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14-4

EB 8314-1 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

2023-11-16 · English

EB 8314-1 EN