T 8314-1 EN
Type 3275A Pneumatic Piston Actuator

Application
Double-acting pneumatic piston actuator for the Type 3241 PSA ValveActuator area

314, 380, 490 and 804 cm²

Rated travel

15 to 30 mm

The actuators are mainly used with Type 3241 Valves in pressure swing adsorption (PSA) plants.
• Low overall height• Powerful thrust thanks to the supply pressure of max. 6 bar• Low friction• Temperature range from –60 to +80 °C
The actuators with 314, 380 and 490 cm² areas are fixed toa yoke, which is designed to accommodate a pneumatic orelectropneumatic positioner. This type of direct attachment has
the following advantages:• Firm and exact mechanical linkage• No misalignment during transport• Travel pick-off protected against touching and external
influences that meets the requirements of the German
Accident Prevention Regulations (VBG 5)• Simple pneumatic connection between actuator andpositioner
The actuator with 804 cm² area does need a yoke. The valve
accessories are mounted over the NAMUR interface.

Fig. 1: Type 3275A Pneumatic Piston Actuator, version with 314,
380 or 490 cm² actuator area

Versions–

Type 3275A · Pneumatic piston actuator (Fig. 1), 314,
380 or 490 cm² effective actuator area

–Type 3275A · Pneumatic piston actuator (Fig. 2), 804 cm²
effective actuator area with positioner attachment to theNAMUR interface

Further versions–

Deviating travels on request–

Version with side-mounted handwheel · Data Sheetu T 8312–

Special version with auxiliary spring · To reach a definedend position upon supply air failure

Fig. 2: Type 3275A Pneumatic Piston Actuator, version with804 cm²

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

Edition November 2023

Principle of operation
The double-acting Type 3275A Pneumatic Piston Actuatorwith 314, 380, 490 and 804 cm² actuator areas consists ofthe cover (2 or 4), base (1 or 10) and piston (9). The stem
connector clamps connect the actuator's piston stem (7) withthe plug stem of the globe valve.
The signal pressure pst creates the force F = pst · A at the pistonsurface A, which is opposed by the corresponding counter-pressure. The piston is pressurized with the supply air overthe two connections (G 3/8 or G ½).
The actuators with 314, 380 and 490 cm² actuator areas are
fixed to a yoke, which is designed to accommodate a pneumatic or electropneumatic positioner. See Fig. 3.
The actuator with 804 cm² area does need a yoke (seeFig. 4). The valve accessories are mounted over the NAMUR
interface.

1611927Fig. 4: Type 3275A Pneumatic Piston Actuator, version with804 cm² actuator area

The double-acting piston actuator has no springs. A defined
final position is not reached when the signal pressure is
reduced or the air supply fails.

10480314cm²
380cm²490cm²

5cm
²bar
64

63

11924
1070

10

2030
18.4 22.8 29.4

4050 KN
48.2

Fig. 5: Diagram showing thrusts of Type 3275A Pneumatic Piston
Actuator
Legend for Fig. 3 and Fig. 4

Fig. 3: Type 3275A Pneumatic Piston Actuator, version with 314,
380 or 490 cm² actuator area

21Base (804 cm²)2

Cover (804 cm²)

4

Cover (314, 380, 490 cm²)

6

Pipe

7

Piston stem

9Piston10

Base (314, 380, 490 cm²)

11Linkage

T 8314-1 ENTable 1: Technical data
VersionType

Actuator area

cm²

314

380

3275A
490

804

Supplypressure

Max.

6 bar

6 bar

6 bar

6 bar

Rated travelmm

Max. actuator
travelmm

Travel volume

cm³

15

1930

15

19

33
471

15

1933

597

942

570

30

15

1933

722

1140

735

931

1470

1206

1528

G 3/8

G½

G½

50 cm³/min

50 cm³/min

58 cm³/min

70 cm³/min

Perm. temperature
range for continuousoperation3033

G 3/8

Air connection
Max. permissible
leakage (t ≥ 0 °C)

302412–60 to +80 °C

Table 2: Materials
Material configuration

Standard (aluminum)

PartHeavy-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

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: Dimensions and weights
Actuator

Type3275A

Actuator area

cm²314380490804

D1mm

268288318405D2mm

248268298385

H1 including liftingeyeletmm

207

207207

214

H2mm

102

102

102

–

H3 (stem retracted)

mm

60

60

60

85

Weight(standard version)

kg

1720

23

41Weight(heavy-duty version)

kg

56

62

68

106

T 8314-1 EN

3

D1

H120

G

D1
GH1G

Ø 16

H354

H334

H220G

Ø 22

Ø 30

Ø 60

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

Type 3275A, version with 804 cm²D1
D2

9Specifications subject to change without notice

T 8314-1 EN2023-11-16 · English

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