Spring Return Fail-Safe Electric Valve Actuators / S Series

Product Overview

Sun Yeh S series spring return electric valve actuators (also called fail safe electric actuators) and tunnel damper valve actuator utilize spring-driven pinion and rack mechanism to provide torque ranges from 50N‧m to 360N‧m mechanical fail-safe quarter-turn electric actuators. When power is supplied, the spring mechanism is compressed to store energy for movement. Once the power is lost or removed, the controlled valve or damper will be driven to a fail-safe position (either Fail OPEN or fail Closed) in either clockwise (CW, standard) or counter clock wise (CCW, optional) rotation.

In addition to standard open/close (two-position) control, floating(except S-3600) and modulating control(except S-3600) are available for option per application requirements. The open/close control is equipped with a buffer to reduce damages caused by the water hammer which is resulting from sudden starting or stopping of flow.

A clutch-less manual override is an available option of our spring return electric actuators which provide manual operation when power outage, no clutch or brake is required to change from electrical control to manual operation. If you are interested in our spring return valve actuators, feel free to send an inquiry to us!