Pneumatic control valves that control the flow direction, flow rate, and pressure of compressed air in pneumatic systems. Includes directional control valves such as 5-port 2-position and 3-port 2-position valves, flow control valves like needle valves and speed controllers, and pressure control valves including relief valves and regulators. Used for controlling pneumatic cylinders and air actuators in manufacturing line automation equipment, robot arms, press machines, and conveying systems. Classified by operation methods including pilot-operated, direct-acting, solenoid valves, and manual valves, supporting from ON/OFF control to precise speed control. Distinguished from hydraulic control valves by using compressed air as the working medium.