9 Terms
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Control valves
Industry: Industrial valves
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Control valves
packing follower
Industrial valves; Control valves
A part that transfers a mechanical load to the packing from the packing flange or nut.
pressure recovery factor (F1)
Industrial valves; Control valves
A number used to describe the ratio between the pressure recovery after the vena contracta and the pressure drop at the vena contracta. It is a measure of the amount of pressure recovered between the ...
hard facing
Industrial valves; Control valves
A material that is harder than the surface to which it is applied. It is normally used to resist fluid erosion or to reduce the chance of galling between moving parts. Hard facing may be applied by ...
diaphragm
Industrial valves; Control valves
A flexible pressure-responsive element that transmits force to the diaphragm plate and actuator stem.
modified parabolic
Industrial valves; Control valves
A flow characteristic that lies somewhere between linear and equal percentage. It provides fine throttling at low flow capacity and an approximately linear characteristic at higher flow capacities.
position transmitter
Industrial valves; Control valves
A device that is mechanically connected to the valve stem and will generate and transmit either a pneumatic or electric signal that represents the valve stem position.
positioner
Industrial valves; Control valves
A device used to position a valve with regard to a signal. The positioner compares the input signal with a mechanical feed back link from the actuator. It then produces the force necessary to move ...
