Valve Terminology and Definitions
ACTUATOR: A fluid-powered or electrically powered device that supplies force and motion to a VALVE CLOSURE MEMBER. AIR SET: Also SUPPLY PRESSURE REGULATOR. A device used to reduce plant air supply to valve POSITIONERS and other control equipment. Common reduced air supply pressures are 20 and 35 psig. AIR-TO-CLOSE: An increase in air pressure to the ACTUATOR is required to cause the ...more»