A control valve is a mechanical device used to regulate the flow, pressure, or level of a fluid or gas in a system based on a control signal. It adjusts the opening or closing of the valve to maintain desired operating conditions, enabling precise process control and automation.

Control valves are widely used in industrial automation, chemical processing, HVAC, water treatment, and manufacturing systems. They improve process efficiency, ensure safety, reduce energy waste, and allow accurate and reliable control of system parameters in dynamic operating conditions.