The company's Z641 national standard pneumatic wedge gate valve has the characteristics of reliable performance, convenient operation switching and maintenance. It has been widely used in petroleum, chemical, maritime and other departments to control various media. Pneumatic flange gate valve is equipped with pneumatic actuator and manual mechanism, gate valve actuator adopts double-layer cylinder structure, it is compared with single cylinder pneumatic gate valve, the lifting force is doubled, to solve the drawbacks of some valve plates of single cylinder pneumatic gate valve wedged in the valve body and can not be opened, with buffer mechanism, can effectively reduce the valve plate sealing surface and valve body sealing surface wear caused by the downward impact of the piston when closing the valve, but also can avoid the phenomenon of gate plate jamming. Pneumatic flange gate valves can be equipped with electrical or gas echoes to send valve switching status information. Pneumatic flange gate valve can realize remote control, centralized control and automatic control.