13 Terms
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Control valves
Industry: Industrial valves
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Control valves
fail-in-place
Industrial valves; Control valves
A term used to describe the ability of an actuator to stay at the same percent of travel it was in when it lost its air supply. On SPRING RETURN actuators this is accomplished by means of a lock-up ...
equal percentage
Industrial valves; Control valves
A term used to describe a type of valve flow characteristic where for equal increments of valve plug travel the change in flow rate with respect to travel may be expressed as a constant percent of ...
leak-off
Industrial valves; Control valves
A term used to describe a threaded connection located on the bonnet of a valve that allows for the detection of leakage of the process fluid past the packing area.
push-down-to-open
Industrial valves; Control valves
A term used to describe a linear or globe style valve that uses a reverse action plug and stem arrangement. The plug is located below the seat ring. When the plug is pushed down, the plug moves away ...
push-down-to-c lose
Industrial valves; Control valves
A term used to describe a linear or globe style valve that uses a direct acting plug and stem arrangement. The plug is located above the seat ring. When the plug is pushed down, the plug contacts the ...
lapped-in
Industrial valves; Control valves
A term that describes a procedure for reducing the leakage rate on metal-to-metal seated valves and regulators. The plug and seat are lapped together with the aid of an abrasive compound in an effort ...
position switch
Industrial valves; Control valves
A switch that is linked to the valve stem to detect a single, preset valve stem position. Example: Full open or full closed. The switch may be pneumatic, hydraulic, or electric.
