Shanghai General Gas Valve QF-20 oxygen cylinder valve,gas valve,valve,cylinder valve,oxygen valve Shanghai General Gas ValveQF-20 oxygen cylinder valve,gas valve,valve,cylinder valve,oxygen valve TypeDescriptionMedium AvailabeWP(Mpa)DN(mm)Outlet thread(mm)Inlet thread(mm)Safety device(Mpa)QF-20oxygen cylinder valveO2,N2,atmosphere152G1/2GB8335 PZ19.221±1.5 oxygen cylinder valve QF-20