Pneumatic control valve is a type of valve that uses compressed gas as the power source, cylinder as the actuator, and uses valve positioners, converters, solenoid valves, holding valves, gas storage tanks, gas filters and other accessories to drive the valve, achieving switch or proportional adjustment. It receives control signals from industrial automation control systems to complete the adjustment of various process parameters such as flow rate, pressure, temperature, and liquid level of the pipeline medium. The characteristics of pneumatic control valves are simple control, fast response, and intrinsic safety, without the need for additional explosion-proof measures.