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Valmet ST Pneumatic Actuator, Spring-Return
ST-MS Spring-Return Pneumatic Actuator: -20°F to +180°F operating temperature range. 150 psi maximum supply pressure. Typical Operating Speed 8 seconds.
ST-MS models are ideal for both on-off and control applications. Spring-return type ST-MS actuators can provide spring-to-open or spring-to-close operation for ball valves or spring-to-close operation for butterfly valves. Aluminum body and endcap. Springs are enclosed in a self-contained cartridge for added reliability and easy maintenance. Actuators are lubricated at the factory. No further lubrication is required. Adjustable travel stops are standard for both the open and closed positions. They allow adjustment of the angular stroke from 85° to 110°. Stop screws are protected from accidental changes in setting by acorn nuts.