Self-reliance type pneumatic - valve what are the major parts material

Self-reliance type pressure pneumatic control valve is divided into self-reliance type pressure, differential pressure and flow pneumatic regulator three series. Self-reliance type pressure pneumatic - valve based on pressure point location points before and after valve valve, pressure points in front of a valve used in pneumatic - valve pressure constant before; Pressure points, after valve used in pneumatic - valve after pressure constant. Self-reliance type pressure pneumatic regulator is part of the valve body, valve core and valve seat, valve stem, membrane cover and packing. The body has a ZG230 - 450、ZG1Cr18Ni9Ti 、ZGCr18Ni12Mo2Ti； Valve core has 1 cr18ni9ti, Cr18Ni12Mo2Ti; Seat 1 cr18ni9ti, Cr18Ni12Mo2Ti; Stem 1 cr18ni9ti, Cr18Ni12Mo2Ti; Membrane by A3, A3 steel coated tetrafluoroethylene stainless steel; Packing with nitrile, YiBing, fluorine, oil resistant rubber, etc.