2 General
Explosion Proof Actuators StG 2120.xx, StG 30.90-xx, StG 40.90-xx 5
2.2 Description of Function
The explosion-proof actuator types StG 2120.xx and StG xx90-xx, type of protection
flameproof enclosure “d”, are used for actuating gas valves in gas turbine control
applications.
These actuators are distinguished by following features:
Fast response and high torque in either direction
Low consumption of electric energy
Operation within a wide range of supply voltage
To be mounted in any position
Test certificate for use in hazardous environments
The actuator represents the actuation unit within a closed control loop of gas, steam and
water turbines. By means of this unit, an electric signal from the control unit is converted
into mechanical movement for actuating valves of diverse design.
The rotating movement of the integrated actuator control output shaft of the StG2120
series is generated by a rotary magnet system. This design does not require any gearing.
For the StG xx.90-xx series DC disk motors are used as drives. Torque is transmitted to the
output shaft by a twin-stage gear.
Non-contacting sensing is used to scan the feedback cam on the control output shaft. The
electric signal is a function of the wave position.
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