... , Cr .Mo .SteelSeal ring: Stainless steel, multi-layer asbestos with temperature resistantStem: Stainless steel, Cr .Mo .SteelBearing: ZG00Cr18Ni10 ... butterfly valve have the sealing ability, corrosion resistant, temperature resistant , and wearing resistance. The main futures as ... principle, the compatible to soft sealing and metal multi-layer structure, with best machining and advanced technology. ...