A control valve is a power-operated device used to regulate or manipulate the flow of fluids, such as gas, oil, water, and steam.
It is a critical part of a control loop and is an example of a final control element. The Control Valve is by far the most common final control element used in industry today.
CONTROL VALVE
Description
A control valve can be operated electrically, pneumatically, or hydraulically.
A control valve receives a signal from a controller such as a PLC in order for it to move resulting in a change in flow.