13 Terms
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Control valves
Industry: Industrial valves
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Control valves
effective area
Industrial valves; Control valves
For a diaphragm actuator, the effective area is that part of the diaphragm area that is effective in producing a stem force. Usually the effective area will change as the valve is stroked – being at ...
diaphragm actuator
Industrial valves; Control valves
Is a fluid (usually pneumatic) pressure-operated, spring-opposed diaphragm assembly which positions the valve stem in response to an input signal.
trim
Industrial valves; Control valves
Includes all the parts that are in flowing contact with the process fluid except the body, bonnet, and body flanges and gaskets. The plug, seats, stem, guides, bushings, and cage are some of the ...
linear valve
Industrial valves; Control valves
Another name for a globe valve. It refers to the linear or straight-line movement of the plug and stem.
reverse flow
Industrial valves; Control valves
Flow of fluid in the opposite direction from that normally considered the standard direction. Some rotary valves are considered to be bi-directional although working pressure drop capabilities may be ...
air-to-open
Industrial valves; Control valves
An increase in air pressure to the actuator is required to cause the valve to open. This is another way of saying the valve is fail closed or normally closed.
normally open
Industrial valves; Control valves
An increase in air pressure to the actuator is required to cause the valve to close. This is another way of saying the valve is Fail Open or Normally Open.
