ST+RS Quarter Turn Gearbox Electric Actuator

Mar 23, 2026

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ST+RS electric actuator has archieved an excellent reputation over the years in this market thanks to a range of actuators providing the following features:
Compact construction with a high output torque
Self locking gear train to maintain the position ofthe valve when the actuator is de-energized
Very good resistance to vibrations

Very simple settings - no specific tool required

Adjustable mechanical travel limit stops to prevent overtravel

Removable drive socket for easy machining

Emergency handwheel and mechanical position indicator provided on all actuators as a standard

Quarter-turn electric actuator can be used to control various valves with are gulating angle of 0-90°and the torque range is: 35-10000Nm. It can used for control all of quarter-turn valve like: fue cut-off gate, boiler's primary and secondary wind, boiler's side wind, air pre-heater inlet and outlet damper regulator, butterfly valve, ball valve, louver valve, damper, plug valve, flapper valve, etc. Explosion-proof grade: IP67, IP68.

 

 

Quarter Turn Gearbox Electric Actuator

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