Quality of forged steel gate valve depends on the quality of the sealing portion, its seat assembly is one of the key projects in the manufacturing process.
press-fit the seat usually used press-fitting process for the assembly, but for the seat with the wedge surface, its circumference is difficult to accurately control the position, the inner sealing surface may have deformation. For larger-diameter valve, the circumferential assembly error is larger, seriously affect the quality of the product. It adopted and the body gap with the surface of the wedge seat, get matched shutter to find positive position, then brakes tight, after the expansion of the whole assembly at both ends, so that deformation of the rear is less. All modifications must comply with stringent process parameters.