The pneumatic flange fluorine lined butterfly valve is composed of a pneumatic actuator and a butterfly valve. Pneumatic flange fluorine lined butterfly valve is a type of pneumatic valve that uses a circular butterfly plate that rotates with the valve stem to achieve opening and closing action. It is mainly used as a shut-off valve, and can also be designed to have the function of regulating or segment valve adjustment. Pneumatic flange fluorine lined butterfly valve is increasingly used in low-pressure large and medium diameter pipelines.