Pneumatic control valve is a type of valve that uses compressed gas as its power source, a cylinder as its actuator, and accessories such as valve positioners, converters, solenoid valves, holding valves, gas storage tanks, and gas filters to drive the valve, achieving on/off or proportional regulation. It receives control signals from industrial automation control systems to adjust various process parameters of pipeline media, such as flow rate, pressure, temperature, and liquid level.