The GDQ-J series pneumatic high vacuum flapper valve is powered by compressed air and changes the direction of the air circuit through an electromagnetic directional valve, driving the cylinder piston to move up and down, driving the valve stem to move up and down, causing the valve plate to open or close, thereby achieving the goal of connecting or cutting off flow in the vacuum system. Pneumatic high vacuum flapper valves can be divided into two types according to the shaft seal structure: GDQ-J rubber seal and GDQ-J (b) corrugated pipe seal. The GDQ-J type is an angle through type,