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Samson 3372 User Manual
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Samson 3372 User Manual

Electropneumatic actuator
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Type 3372 Electropneumatic Actuator
Application
Electropneumatic linear actuators for attachment to Type 3214
and Type 3260 Valves as well as Series V2001 Valves
Rated travel
15 and 30 mm
Actuator area
120 and 350 cm²
The Type 3372 Electropneumatic Actuator is available in the
following versions:
• Version with integrated i/p converter, 120 cm² actuator
area and 15 mm rated travel (Fig. 1)
• Version with Type 3725 Positioner (direct attachment),
120 cm² actuator area and 15 mm rated travel (Fig. 2)
• Version with Type 3725 Positioner (direct attachment),
350 cm² actuator area and 15 or 30 mm rated travel
(Fig. 3)
The actuators are suitable for attachment to Series V2001
Valves (e.g. Type 3321, Type 3323, Type 3531, Type 3535)
as well as Type 3214 and Type 3260 Valves. The actuators
mainly consist of two diaphragm cases, a rolling diaphragm
and internal springs. The Type 3372 Electropneumatic Actua-
tor is controlled by a 4 to 20 mA signal. For throttling service,
an i/p converter is integrated into the actuator or a Type 3725
Positioner is mounted to the rod-type yoke using a support ele-
ment.
Further versions
Permissible operating temperatures from –35 to +90 °C
–
Only when a positioner is mounted
Mechanically adjustable limit stop · Only when a posi-
–
tioner is mounted and for 120 cm² actuators
Handwheel · Only when a positioner is mounted and for
–
120 cm² actuators
Explosion protection for a mounted Type 3725 Positioner
–
II 2G Ex ia IIC T4 according to ATEX, intrinsically safe
Ex ia IIC T4 according to CSA Group, 1Ex ia IIC T4 Gb X
according to GOST
Accessories
Type 4744‑2 Limit Switch (Fig. 4) · With explosion protec-
–
tion II 2G Ex db IIC T6-T5 and degree of protection IP 66
A clamping plate can be used to mount it · See Data Sheet
u T 8367
Fig. 1: Type 3372 Actuator with integrated
i/p converter mounted onto
Type 3321 Valve
Fig. 2: Type 3372 Actuator · 120 cm²
Fig. 3: Type 3372 Actuator · 350 cm²
actuator area · With
Type 3725 Positioner (direct
attachment)
Fig. 4: Type 3372 Actuator (120 cm²) with additional
Edition August 2016
Data Sheet
actuator area · With
Type 3725 Positioner (direct
attachment)
Type 4744‑2 Limit Switch
T 8313 EN

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Summary of Contents for Samson 3372

  • Page 1 Type 3260 Valves as well as Series V2001 Valves Rated travel 15 and 30 mm Actuator area 120 and 350 cm² The Type 3372 Electropneumatic Actuator is available in the Fig. 1: Type 3372 Actuator with integrated following versions: i/p converter mounted onto Type 3321 Valve • Version with integrated i/p converter, 120 cm² actuator area and 15 mm rated travel (Fig. 1)
  • Page 2 Rod nut Rolling diaphragm 10.1 Potentiometer for span Signal pressure connection Measuring diaphragm (actuator stem extends) Fig. 5: Type 3372 Electropneumatic Actuator with integrated i/p converter: functional diagram (left), actuator stem retracts (top right), actuator stem extends (bottom right) T 8313 EN...
  • Page 3 Fig. 6: Type 3372 Electropneumatic Actuator with 120 cm² actuator area for the direct attachment of a Type 3725 Positioner Fig. 7: Type 3372 Electropneumatic Actuator with 350 cm² actuator area for the direct attachment of a Type 3725 Positioner Legend for Fig. 6 and Fig. 7 Diaphragm case Hexagon bolt Wiper ring Diaphragm...

  • Page 4: Operation

    Table 1: Technical data Table 1.1: Electric data for Type 3372 Type 3372 With integrated i/p converter With Type 3725 Positioner (direct attachment)  1) Actuator area 120 cm² 120 cm² 350 cm² Rated travel 15 mm 15 mm 15 mm 30 mm Conversion of a DC signal into a pneumatic output Electropneumatic positioner with self-calibrating, Function (mounted device)
  • Page 5 RU C-DE.GB08.B.00697 Date 2014-12-15 GOST – Valid until 2019-12-14 Type of protection 1EX ia IIC T4 Gb X Versions with Type 3730-x or Type 3731-x Positioner on request Table 1.3: Further technical data for Type 3372 Type 3372 With integrated i/p converter With Type 3725 Positioner (direct attachment) Actuator area 120 cm² 120 cm² 350 cm² Rated travel 15 mm 15 mm...

  • Page 6: Mounting Types

    Mounting types There are two types of mounting depending on the valve/actuator combination: mounting using a crossbeam or mounting on rods. When the actuator is mounted to the valve using a crossbeam (Form B, Fig. 8), the actuator is fastened to the valve bonnet using a central nut.
  • Page 7 Table 3: Bench ranges of Type 3372 Actuator Fail‑safe action: actuator stem extends Fail‑safe action: actuator stem retracts Spring force [kN] at rated travel Spring force at Spring force at and supply pressure [bar] of 0 mm travel [kN] rated travel [kN] 1800 0.4 to 1.4 – – 1800 1.4 to 2.3 – 1800 2.1 to 3.3 – – – – – 5250 1.5 to 2.1 – –...

  • Page 8: Order Specifications

    According to Table 3 Valve accessories Type 4744-2 Limit Switch Specifications subject to change without notice SAMSON AG · MESS- UND REGELTECHNIK Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 T 8313 EN  samson@samson.de · www.samson.de...