- Industry: Industrial valves
- Number of terms: 3113
- Number of blossaries: 0
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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 transmits motion or force from the actuator to the valve.
Industry:Industrial 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.
Industry:Industrial 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.
Industry:Industrial 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 direct-acting valve is one with a push-down-to-c lose plug and seat orientation. A direct-acting positioner or a direct-acting controller outputs an increase in signal in response to an increase in set point.
Industry:Industrial 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 reverse-acting valve is one with a push-down-to-open plug and seat orientation. A reverse-acting positioner or a reverse-acting controller outputs a decrease in signal in response to an increase in set point.
Industry:Industrial 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.
Industry:Industrial valves
The proper definition for bench set is the inherent diaphragm pressure range, which is the high and low values of pressure applied to the diaphragm to produce rated valve plug travel with atmospheric pressure in the valve body. This test is often performed on a work bench in the instrument shop prior to placing the valve into service and is thus known as Bench Set.
Industry:Industrial valves
The total force produced on the valve plug in any stated open position by the fluid pressure acting upon it. The particular style of valve, i.e. Single-ported, double-ported, flow-to-open, flow-to-close, has an effect on the amount of dynamic unbalance.
Industry:Industrial valves
The return signal that results from a measurement of the directly controlled variable. An example would be where a control valve is equipped with a positioner. The return signal is usually a mechanical indication of valve plug stem position which is fed back into the positioner.
Industry:Industrial valves
The relationship of input to output. If the full range of the input is equal to the full range of the output, then the gain is 1. Gain is another way to describe the sensitivity of a device.
Industry:Industrial valves
