Samson 3374 Mounting And Operating Instructions - 1.1 Additional Equipment
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 syn-
chronous motor and a maintenance-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 Type 3260
(DN 65 to 150), Type 3214 (DN 65 to 150)
and Series V 2001 Valves.
Actuator versions for central attachment
using an M30 x 1.5 ring nut are preferably
combined with Type 3214 (DN 125 to 150)
and Series 240 Valves.
1.1 Additional equipment
The actuators can be equipped with addi-
tional units, such as limit switches and poten-
tiometers, to influence the tasks of control
systems.
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.
Note!
The device with a CE marking fulfils the requirements of the Directives 94/9/EC (ATEX) and
89/336/EEC (EMC).
The declaration of conformity can be viewed and downloaded on the Internet at
http://www.samson.de.
EB 8331-1 EN
3
Design and principle of operation