... , stainless steel, Cr .Mo .SteelSeal ring: Stainless steel, multi-layer asbestos with temperature resistantStem: Stainless steel, Cr .Mo .SteelBearing: ... steel. Cr-Mo steelPacking: Flexible graphiteStructureThe series of multi-layer metal-to-metal butterfly valve is the new ... principle, the compatible to soft sealing and metal multi-layer structure, with best machining and advanced technology. And ...