A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level.
In automatic control terminology, a control valve is termed a "final control element".
A control valve consists of three main parts in which each part exist in several types and designs:
- Valve’s actuator type
- Valve’s positioner type
- Valve’s body material
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