... steel, Cr .Mo .SteelSeal ring: Stainless steel, multi-layer asbestos with temperature resistantStem: Stainless steel, Cr .Mo .SteelBearing ... valve has the ideal sealing track because of following three-eccentric principle, without friction and interference between sealing ... designed according to the three-dimensional principle, the compatible to soft sealing and metal multi-layer structure, with best ...