Pneumatic control valve is to compressed gas as power source, to the cylinder as the actuator, and with the help of valve positioner, converter, solenoid valve, position valve, gas storage tank, gas filter and other accessories to drive the valve, to achieve switching or proportional regulation, Receive industrial automation control system control signals to complete the adjustment of pipeline medium: flow, pressure, temperature, liquid level and other process parameters. Pneumatic control valve is characterized by simple control, fast response, and essential safety, without additional explosion-proof measures