Pneumatic Flap Valve

No rotary action means no need to build clearence (leckage) into the valve. Double flaps ensure the seal is never lost throughtout filling and emptying of the valve. Full throught opening eliminates bridging, jamming and material build up. Seat and flapper can be reground several times to bring them back to original condition and performance. Housing does not come in contact with material allowing it to last much longer life.