... , stainless steel, Cr .Mo .SteelSeal ring: Stainless steel, multi-layer asbestos with temperature resistantStem: Stainless steel, Cr .Mo .SteelBearing ... , corrosion resistant, wear resistance long lifetime. StructureThe series of multi-layer metal-to-metal butterfly valve is the new one ... technology. And the valve is mainly made up of body, disc, multi-layer seat, staminate actuator. DNSizeΦDΦD2ΦD1 ...