T 8310-12 EN
Pneumatic Actuators 1000 cm²
Type 3271 · Customer standard SAM001

Application
Linear actuators particularly suitable for attachment to SAMSON Series 240, 250, 280 and 290 Valves
The customer standard SAM001 indicates SAMSON devices that comply with the NAMUR Recommendation NE 53. After
subscribing to the u NE53 newsletter, users of these devices automatically receive information on any hardware or softwarechanges.
Actuator area

1000 cm²Travel

60 mm

The Type 3271 Pneumatic Actuators are diaphragm actuatorswith rolling diaphragm and internal compression springs.
Special features• Powerful thrust at high stroking speed• Low friction• Various bench ranges by varying the number of springs ortheir compression• No special tools required to change the bench range orreverse the direction of action• Permissible operating temperatures from –60 to +90 °C• Female thread on the top diaphragm caseVersions–

Type 3271 · Pneumatic actuator, 1000 cm² actuator area–

Type 3271 · Actuator with travel stop, minimum or maximum travel mechanically adjustable

Further versions–

Type 3273 Side-mounted Handwheel · See Data Sheetu T 8312–

Versions for other control media (e.g. water) available onrequest.

Fig. 1: Type 3271 (1000 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 September 2023

Principle of operation
The signal pressure pst creates the force F = pst x A at the diaphragm surface A (4) which is opposed by the springs (10) in
the actuator. The bench range is determined by the number ofsprings used and their compression, taking into account therated travel. The travel H is proportional to the signal pressure
pst. The direction of action of the actuator stem (7) depends on
how the springs are installed in the actuator.
The stem connector (26) connects the actuator stem (7) withthe plug stem of the valve.

1610
1
4

The adjustable mechanical travel stop allows the travel to belimited by up to 50 % in both directions (actuator stem extends
or retracts) and permanently adjusted.
Direction of action
Actuators are available with the following directions of action:––Actuator stem extends (FA): the springs cause the actuator
stem to move to the lower end position when the diaphragm is relieved of pressure or when the supply airfails.
Actuator stem retracts (FE): the springs cause the actuator
stem to retract when the diaphragm is relieved of pressure
or when the supply air fails.

2S
8726

Throttling or on/off service
The Type 3271 Pneumatic Actuators are designed for a maximum supply pressure of 6 bar when used for throttling service.
With the direction of action "actuator stem extends" and travel stop, the supply pressure must not exceed the upper benchrange value by more than 1.5 bar.

1

Top diaphragm case2

Bottom diaphragm case

4Diaphragm

7Actuator stem

8Ring nut

10Springs

16

Vent plug

26

Stem connector

S

Signal pressure connection

Fig. 2: Type 3271 with 1000 cm² actuator area

2

T 8310-12 EN

Table 1: Technical data
Table 1.1: Type 3271 Pneumatic Actuator
Version1000 cm²

Max. supply pressure

6 bar 1)

Permissible ambient temperatures

Diaphragm material NBR: –35 to +90 °C 2) 3)

Degree of protection

IP 54 4)

MaterialsActuator stem

Stainless steel

Actuator stem sealing

NBR
1.0982 S460 MC
Sheet steel, painted≥–60 °C

Housing and associated ambienttemperature
1)
2)
3)
4)

Observe supply air restrictions.
In on/off service, lowest temperature restricted to –20 °C
Install vent plug (u AB 07) for temperatures below –20 °C.
The pneumatic actuators do not pose any risk in the sense of the protection requirements described in DIN EN 60529. The IP rating depends
on the connecting parts used on the pressurized side and the spring chamber side of the actuator. In this case, components (air vents as well asvalves accessories, such as solenoid valves, positioners etc.) must be used that comply with the requirements. The maximum rating that can beachieved with the standard air vent is IP 54 (u AB 07). Depending on the IP rating of the valve accessories, a maximum rating of IP 66 can beachieved for an actuator with air purging of the actuator spring chamber.

Table 1.2: Versions
Version1000 cm²

Mechanical travel stops on both sides•

Throttling service•

On/off service•

Table 2: Bench ranges

0.8…2.46420–

102030–0.6 to 3.0

1.2 to 3.6

9630

––

102030

1.5 to 3.7

101032––81828

2.1 to 4.8131542–––818

1.0 to3.2 *)1.5 to4.2 *)*)
1)
2)

Add. possible spring compression in %Spring force at rated travel in kN 2)

80

0.4 to 2.0

Bench range in bar(Signal pressure range at rated travel)

Max. travel in mm 1)

Dead volume in dm³
6.1

Spring force at 0 mm travel in kN 2)

6.4

No. of springs

60

Travel volume at rated travel in dm³Rated travel in mm

Actuator area in cm²1000

Thrust in kN 2) at rated travel and supply pressure in bar ofOperating range with spring compressionin bar

Type 3271

Actuator type

All pressures in bar (gauge) · Pretensioned springs cannot be used with the direction of action “actuator stem retracts” for Series
240, 250 and 280 Valves.

25

1.4

2.0

3.0

4.0

5.0

6.0

With fail-safe action "actuator stem extends" only
Based on lower bench range value. The zero travel is not taken into account (see Table 3).
The forces specified relate to the bench range.

T 8310-12 EN3

Table 3: Dimensions and weights for versions without handwheel
Actuator

Type3271

Actuator area

cm²1000

H 1)

313

H'267

Ha

19

H4ratedFA

165

H4maxFA169

H4maxFE

185

HeightTravel limitation
Diameter

H654

H7 2)

90

H8220

ØD

462

ØD222

Ød (thread)
Pneumaticconnection(optional)

M60x1.5a

G ¾/¾ NPT

a2–

Weight 3) in kg (approx.)
Without handwheel

H'HHaa

Ød

H4H4
ØD2

H6aH8aH6a

H'Dimensional
drawings

H73)

H2)

In versions in which the lifting eyelet is welded directly onto the housing or the design does not allow for a horizontal connecting surface on thehousing, H' and H are identical. The value H' applies in this case.
Height of eyebolt according to DIN 580. Height of the swivel hoist may differ.
The specified weight applies to a specific standard device configuration. Weights of other actuator configurations may differ depending on theversion (material, number of actuator springs etc.).

Ha1)

80

ØD2

ØD

ØdØD

Fig. 3: Type 3271 with 1000 cm² actuator area4Fig. 4: Adjustable travel stop

T 8310-12 EN

Accessories

Ordering text

The pneumatic actuators with 1000 cm² actuator area have afemale thread on the top diaphragm case to allow an eyebolt
or swivel hoist to be screwed into it. The eyebolt can be used
to vertically lift the actuator and is included in the scope of delivery. The swivel hoist is designed for setting a control valve
assembly upright or for lifting the actuator without valve. Theswivel hoist can be ordered (accessories).

Actuator

Item no.
Actuator area

Ring bolt(DIN 580)

Swivel hoist

1000 cm²

8325-0135

8442-1018

Type 3271

Actuator area

1000 cm²

Travel60 mm

Optional

Travel limitation

StandardCustomer standard SAM001

Bench range... barDirection of action

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

Signal pressureconnection

G .../... NPT

Rolling diaphragm

NBR

List of documentation for Type 3271 and Type 3277 Pneumatic Actuators
Data sheet
Device type

Actuator area in cm²

SAM001 1) product line

General product line

120Types 3271 and 3277
Pneumatic Actuators

350175v2 · 350v2 · 750v2

u EB 8310-1u T 8310-1/4/5/6

Included in this data sheet

355v2
1000
Type 3271 PneumaticActuator1)

1400-120 · 2800 · 2 x 2800

Mounting andoperating instructions
u EB 8310-6
u EB 8310-5
u EB 8310-4

u T 8310-2/7

u T 8310-12

u EB 8310-2–

u EB 8310-7

1400-60

u T 8310-3

u T 8310-13

u EB 8310-3

1400-250

u T 8310-8–

u EB 8310-8

Separate data sheets have been created for Type 3271 and Type 3277 Pneumatic Actuators that comply with the SAM001 standard.

T 8310-12 EN5T 8310-12 EN

2024-01-17 · English

Specifications subject to change without notice