Flow control valves are devices used to regulate the flow of liquids or gases in a system. They can adjust the flow rate, pressure, and direction, ensuring that the system operates efficiently. These valves are commonly found in various applications, including hydraulic systems, pneumatic systems, and water supply networks. There are different types of flow control valves, such as gate valves, globe valves, and ball valves, each serving specific purposes. By controlling the flow, these valves help maintain optimal performance and prevent issues like overpressure or leaks in the system.