Control valves

Control valves

Industry: Industrial valves

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Control valves

Loading pressure

Industrial valves; Control valves

The pressure used to position a pneumatic actuator. It is the pressure that is actually applied to the actuator diaphragm or piston. It can be the INSTRUMENT PRESSURE if a valve positioner is not ...

The net force produced on the valve stem by the fluid pressure acting on the closure member and stem within the pressure retaining boundary. The closure member is at a stated opening with a stated ...

Reduced trim

Industrial valves; Control valves

Is an undersized orifice. Reduced or restricted capacity trim is used for several reasons. (1) It adapts a valve large enough to handle increased future flow requirement with trim capacity properly ...

Cavitation

Industrial valves; Control valves

Occurs only in liquid service. In its simplest terms cavitation is the two-stage process of vaporisation and condensation of a liquid. vaporisation is simply the boiling of a liquid, which is also ...

Flashing

Industrial valves; Control valves

Is the boiling or vaporising of a liquid. See the definition of cavitation. When the vapour pressure downstream of a control valve is less than the upsteam vapour pressure, part of the liquid changes ...

Direct actuator

Industrial valves; Control valves

Is one in which the actuator stem extends with an increase in diaphragm pressure.

Flow characteristic

Industrial valves; Control valves

The relationship between valve capacity and valve travel. It is usually expressed graphically in the form of a curve. Control valves have two types of characteristics inherent and installed. The ...