A control valve is a type of valve used to regulate the flow rate, pressure, temperature, or liquid level in a piping system by varying the size of the flow passage. Unlike simple on/off valves (like gate or ball valves), a control valve works automatically it receives a signal from a controller and adjusts its opening to maintain the desired process condition.
The casing that holds the internal parts.
The device that moves the valve plug/disc (can be pneumatic, hydraulic, or electric).
Ensures the valve opens to the exact position according to the control signal.
Controls the flow by moving up/down or rotating.
Globe Valve (most common for control).
Diaphragm Valve.
Pinch Valve.
Butterfly Valve.
Ball Valve.
Plug Valve.
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