Reference No: A0703

Valve Actuator (SIEKA) covering seismic sizing

The SIEKA Valve Actuator combines a very compact and rigid design with high actuating torques. The valve actuator is designed for small shut-off valves with self-locking threaded stems as used in nuclear power plants, fossil-fired power plants and chemical plants. Typical valve actuators are bulky, because of the high actuating forces they need to provide. These large designs result in high seismic loads which can permanently damage the valves. Our SIEKA actuator’s compact design is owed to a gearing mechanism which allows the gear transmission ratio to change: for traversing to a limit position, the actuator provides a defined, low torque, for traversing out of a limit position, the actuator provides a breakaway torque which is three times higher.

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