Technical And Mechanical Design; Transmission Of Power; Coupling - Siemens Acvatix SAS31.03 Manual

Function principle
Siemens
Building Technologies
4.3

Technical and mechanical design

4.3.1

Transmission of power

Incoming positioning signals are translated to positioning commands for the motor.
A gear train transmits the motor's positioning steps to the output stage. Here, the
translation from rotary to stroke movement takes place. Attached to the gear train
are the electrical and mechanical accessory items and the manual adjuster. With
the stroke actuators with fail safe function, the gear train also accommodates the
return spring.
In the case of the rotary actuators, the adjustment to the required torque is made in
the output stage.
4.3.2

Coupling

SAS.., SAT..
Actuator stem and valve stem run into each
other. They are not permanently connected.
Actuators SAS.., SAT.. for valves
Functions and control
Power transmission of stroke actuator:
1 Actuator stem
2 Contact point
actuator stem – valve stem
3 Valve stem
4 Valve spring
The transmission of power has no fix
connection.
If the actuator stem extends, it presses
on the valve stem and against the force
of the spring in the valve.
If the actuator stem retracts, the valve
stem follows the actuator stem due to
the force of the valve spring.
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CE1P4041en
2015-05-19