12 EB 8331-4 EN
Design and principle of operation
3 Design and principle of oper-
ation
The Type3374 Electric Actuator is used in
industrial plants as well as in heating, venti-
lation and air-conditioning systems.
The actuator is suitable for form-t attach-
ment to various SAMSON valve series, de-
pending on the version with or without fail-
safe action.
The stepper motor is switched off by
torque-dependent switches in the end posi-
tions or in case of overload. The force of the
motor is transmitted to the actuator stem via
gearing and ball screw.
The Type3374 Actuator is optionally avail-
able with either integrated yoke (Fig.1) or
using an M30x1.5 ring nut (Fig.2) including
the necessary stem connecting parts.
TestingaccordingtoDINEN14597
The Types3374 Electric Actuator with fail-
safe action "actuator stem extends" is tested
by the German technical surveillance associ-
ation (TÜV) according to DINEN14597 in
combination with various SAMSON valves.
The register number is available on request.
3.1 Versions
The Type3374 Electric Actuator is available
with or without fail-safe action.
Version with fail-safe action
Type 3374-2x and Type 3374-3x Actuators
are able to perform a fail-safe action and
contain a spring assembly and an electromag
-
net. The actuator moves to the fail-safe posi-
tion when the electromagnet is de-energized.
Fig.1: Construction with integrated yoke
Fig.2: Construction for mounting with ring nut
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