Samson Electri Actuator Type 3374 EB 8331-1 EN - Manual (Page 5)

1 Design and principle of
operation
The Type 3374 Electric Actuator is used in
industrial plants as well as in heating, venti-
lation and air-conditioning systems.
The actuator is suitable for form-fit attach-
ment to various SAMSON valve series, de-
pending on the version with or without
fail-safe action. The actuators consist of a
reversible synchronous motor and a mainte-
nance-free planetary gear with ball screw.
The synchronous motor is switched off by
torque-dependent switches when the final
positions are reached or in case of an over-
load.
The motion is transmitted to the actuator
stem by the gears and ball screw.
Actuator versions with integrated yoke are
primarily used for attachment to Series
V2001 Valves, Type 3260 (DN 65 to 150),
and Type 3214 (DN 65 to 250) Valves.
Actuator versions for central attachment us-
ing an M30 x 1.5 ring nut are preferably
combined with Series 240 Valves and
Type 3214 Valves (DN 125 to 150).
1.1 Additional equipment
The actuators can be equipped with addi-
tional units, such as limit contacts and resis-
tance transmitters, to influence the tasks of
control equipment. In addition, the actuator
can be equipped with a digital positioner for
processing standard signals in the range of
0 (2) to 10 V or 4 (0) to 20 mA.
Refer to section 5 for details on retrofitting
additional equipment.
EB 8331-1 EN
5
Design and principle of operation