High-Pressure Forged Steel Slab Gate Valves (Part Two)
(3) The sealing surface of the wedge disc is welded by STL hard alloys. After fine finishing and grinding of the valve seat, the surface roughness Ra value is 0.4μm, and the parallelism of both sides is 0.08mm. (4) The common structure of the valve seat is shown in the Figure 5(a). The disadvantage of this structure is that the non-metallic sealing ring is prone to leakage after damage, and only the valve seat at the outlet end is sealed, that is, the wedge disc is...