... seat, the sleeve, the double seat (two Three Contacts) three kinds, the seal form has the packing ... , valve seat: 1Cr18Ni9T, OCr18Ni12MO2Ti, 1Cr18Ni9Ti built-up welding Si Tailai alloySleeve, valve plug: 1Cr18Ni9T, OCr18Ni12MO2Ti, 1Cr18Ni9Ti built ... -up welding Si Tailai alloyPadding: Teflon, flexible graphiteCorrugated diaphragm: Ding Qingxiang ...