8 Terms
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Control valves
Industry: Industrial valves
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Control valves
normally closed
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.
stem
Industrial valves; Control valves
The valve plug stem is a rod extending through the bonnet assembly to permit positioning of the plug or closure member. The actuator stem is a rod or shaft which connects to the valve stem and ...
flow coefficient
Industrial valves; Control valves
The valve flow coefficient is the number of U. S. Gallons per minute of 60 degree F water that will flow through a valve at a specified opening with a pressure drop of 1 psi across the valve.
current-to-pneumatic signal conversion (I/P)
Industrial valves; Control valves
This term is commonly used to describe a type of transducer that converts an electric (4-20 m. A) input signal to a pneumatic (3-15 psig. ) output signal.
direct acting
Industrial valves; Control valves
This term has several different meanings depending upon the device it is describing. A direct-acting actuator is one in which the actuator stem extends with an increase in diaphragm pressure. A ...
reverse acting
Industrial valves; Control valves
This term has several deferent meanings depending upon the device it is describing. A reverse-acting actuator is one in which the actuator stem retracts with an increase in diaphragm pressure. A ...
valve flow coefficient (Cv)
Industrial valves; Control valves
The valve flow coefficient is the number of U. S. Gallons per minute of 60 degree F water that will flow through a valve at a specified opening with a pressure drop of 1 psi across the valve.
