Design And Principle Of Operation - Samson 5824 Mounting And Operating Instructions

Design and principle of operation

1. Design and principle of operation
The electric actuators consist of a reversible
synchronous motor and a maintenance-free
gear incorporated in a plastic housing.
The actuator is connected to the valve by
means of a coupling nut (4), which provides
a force-locking connection, or by means of
a stem connector, which provides a form-fit
connection between the actuator stem and
the plug stem.
The rotary motion of the actuator motor is
transmitted to the actuator stem (3), and
hence to the plug stem of the connected
valve via a crank disc.
The motor is disconnected via torque-
dependent switches (10) when the valve
has reached either of its final positions or
an overload occurs.
Type 5824 without fail-safe action
In case of a force-locking connection be-
tween actuator and valve, the spring in-
stalled in the valve causes the plug stem to
follow the movement of the actuator stem
when the actuator stem retracts.
The valve can be manually moved to the
desired position by means of a handwheel (2).
6
EB 5824-1 EN
Type 5825 with fail-safe action
The actuators with fail-safe action largely
comply with the Type 5824 version illus-
trated in Fig. 2. In addition, they contain a
spring mechanism (8) and an electromagnet.
If the control voltage applied to the electro-
magnet is interrupted, the actuator moves to
the fail-safe position.
When de-energized in this way, the magnet
disengages the coupling between gear and
actuator motor. This causes the spring mech-
anism to move the actuator stem fully in the
operating direction OUT (or IN). The con-
nected (globe) valve is moved to the closed
position.
CAUTION! Do not use the magnet for con-
trol tasks.
The Type 5825 is not equipped with a hand-
wheel (2) on the housing cover.
Manual adjustment via a hexagonal wrench
is only possible after the front cover has
been removed.
Typetest
The electric actuators with fail-safe action
have been typetested by the German
Technical Inspectorate TÜV according to
DIN 32730.
The register no. is indicated on the name
plate.