A control valve is a mechanical device used to regulate the flow of fluids, such as liquids or gases, within a system. It adjusts the flow rate and pressure by opening or closing in response to signals from a control system. This ensures that processes operate efficiently and safely, making control valves essential in industries like oil and gas, water treatment, and chemical manufacturing. Control valves come in various types, including globe valves, ball valves, and butterfly valves, each designed for specific applications. They are often equipped with actuators that can be powered by electricity, air, or hydraulic pressure, allowing for precise control over the fluid dynamics in a system.