The pneumaic UPVC double diaphr agm valve is char acterized by a diaphi agm valve that separ ates

the inner cavity of the lower body from the inner ogvity of the upper valve cover, 50 th& the valve rod and

valve disc bove the diaphragm are not corroded by the medium, and the packing seal structur e is omitted

and the medum leakage wll not be produced. The inner gavity porttion 1格made of rubber or plastio soft

sal, and the sealing performance is god.