Classification of Valves

- Nov 28, 2018-

The following are some of the commonly used valve classifications, based on mechanical motion:

  • Linear Motion Valves. The valves in which the closure member, as in gate, globe, diaphragm, pinch, and lift Check Valves, moves in a straight line to allow, stop, or throttle the flow.

  • Rotary Motion Valves. When the valve-closure member travels along an angular or circular path, as in butterfly, ball, plug, eccentric- and Swing Check Valves, the valves are called rotary motion valves.

  • Quarter Turn Valves. Some rotary motion valves require approximately a quarter turn, 0 through 90°, motion of the stem to go to fully open from a fully closed position or vice versa.

CLASSIFICATION OF VALVES BASED ON MOTION

VALVE TYPESLINEAR MOTIONROTARY MOTIONQUARTER TURN
GATEYESNONO
GLOBEYESNONO
PLUGNOYESYES
BALLNOYESYES
BUTTERFLYNOYESYES
SWING CHECKNOYESNO
DIAPHRAGMYESNONO
PINCHYESNONO
SAFETYYESNONO
RELIEFYESNONO
VALVE TYPESLINEAR MOTIONROTARY MOTIONQUARTER TURN