13 Terms
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Control valves
Industry: Industrial valves
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Control valves
air-to-close
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.
transducer
Industrial valves; Control valves
An element or device which receives information in the form of one quantity and coverts it to information in the form of the same or another quantity. (See I/P)
quick opening
Industrial valves; Control valves
A flow characteristic that provides maximum change in flow rate at low travels. The curve is basically linear through the first 40% of travel. It then flattens out indicating little increase in flow ...
actuator
Industrial valves; Control valves
A fluid-powered or electrically powered device that supplies force and motion to a valve closure member.
piston actuator
Industrial valves; Control valves
A fluid-powered, normally pneumatic device in which the fluid acts upon a movable cylindrical member, the piston, to provide linear motion to the actuator stem. These units are spring or air opposed ...
stem guide
Industrial valves; Control valves
A guide bushing closely fitted to the valve stem and aligned with the seat. Good stem guiding is essential to minimizing packing leakage.
post guide
Industrial valves; Control valves
A guiding system where the valve stem is larger in the area that comes into contact with the guide busings than in the adjacent stem area.
