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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 linear actuator is suitable for form-fit at
-
tachment to various SAMSON valve series,
depending 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
V 2001 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 (DN 125 to 150) .
1.1 Additional equipment
The actuators can be equipped with addi
-
tional units, such as limit switches and po
-
tentiometers, to influence the tasks of control
equipment. In addition, the actuator can be
equipped with a digital positioner for pro
-
cessing 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