Up-mounted butterfly valve

Abstract

The invention discloses an up-mounted butterfly valve. An outer valve body, an inner valve body, a valve cover, a valve rod, a butterfly plate, a valve base seal ring, a butterfly plate seal ring, a pressing disc, a pressing disc gasket, a metal winding pad, a valve cover winding pad, an elastic adjusting gasket, a split collar, a screwed plug, a cylindrical pin and a shaft sleeve are included. Each of the outer valve body and the inner valve body is provided with a cavity, and the two ends of each cavity are provided with an inlet and an outlet for medium circulation correspondingly. The outer sides of the inlets and the outlets of the outer valve body and the inner valve body are provided with 5-degree inclined planes. A pressure unloading hole is formed in the inlet side of the inner valve body. The 5-degree inclined plane of the outlet side of the inner valve body is provided with a groove, and the groove is internally provided with the metal winding pad. The up-mounted butterfly valve can be integrally detached at a time, only an upper cover needs to be opened, meanwhile, the butterfly plate seal ring and the valve base seal ring can be conveniently replaced, the opposite position of the seal rings is adjusted, and the enough seal specific pressure is guaranteed; and in addition, threaded holes reserved in the upper end and the lower end of the inner valve body can be utilized for the offline pressure test, and the installing and overhauling efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a top-mounted butterfly valve. Background technique [0002] In the Chinese invention patent specification CN 105351538 A, a top-loading butterfly valve is disclosed, which mainly includes: a valve body with a cavity, the two ends of the cavity have an inlet and an outlet for the medium to flow, the top has an opening, and the bottom has a mounting Groove, the valve seat seal ring is arranged on the outlet of the inner wall of the valve; the valve cover (3) is fixedly installed on the valve body through fasteners, and a metal winding gasket (10) is arranged between the valve body and the valve cover (3) for sealing The valve stem (4) is perpendicular to the flow direction of the medium in the valve body, and is fixed axially with the valve body through the valve cover (3) and the limit assembly, and is connected with axial rotation; the butterfly plate is fixed on the valve stem (...

AI Technical Summary

Problems solved by technology

Since the valve seat sealing ring is arranged on the inner wall of the outlet valve, when the valve seat is damaged and needs to be replaced, the pipeline can only be cut and repaired, which is difficult and expensive to repair; secondly, the limit assembly and the shaft of the valve stem (4) assembly In addition, it is necessary to ensure that the position of the sealing ring of the valve seat is relatively accurate, and the dimensional accuracy is extremely high, which increases the difficulty of processing and assembly; in addition, if the sealing specific pressure between the sealing ring of the valve seat and the sealing ring of the butterfly plate is to be adjusted, It can only be disassembled and assembled multiple times and tested on site, so the requirements for on-site operating conditions are harsh

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