Straight stroke without material loss, high temperature and normal pressure packing sealing structure

Abstract

The invention relates to a straight-stroke non-material loss high-temperature and normal-pressure packing sealing structure, which includes an upper valve cover, which has an accommodating cavity; a valve stem, which passes through the accommodating cavity of the upper bonnet; and a packing part, which is located in the accommodating cavity , and set on the valve stem; the packing gland, which is set on the valve stem, and its bottom is inserted into the opening of the accommodating cavity; the packing part includes the first scraper ring, the second A composite filler, a supporting ring, a second composite filler, and a second scraper ring; the first and second scraper rings are arranged symmetrically; the first scraper ring includes metal scrapers arranged up and down, and a metal scraper located between them Graphite sealing ring; the bottom of the inner ring of the metal scraper at the bottom is provided with an arc angle, and the bottom of the inner ring of the metal scraper is provided with an annular material storage tank; it effectively solves the problem of the straight-stroke regulating valve stem operating under high temperature and normal pressure conditions. The phenomenon of valve stem crawling, high temperature lockup, offset and medium leakage at the packing place.

Description

technical field [0001] The invention relates to a high-temperature and normal-pressure straight-stroke regulating valve, in particular to a high-temperature and normal-pressure stuffing sealing structure for a straight stroke without material loss. Background technique [0002] The sealing packing of the valve under the condition of high temperature and normal pressure usually chooses a packing assembly composed of graphite and graphite packing, but this packing sealing structure has some shortcomings in actual use, and the valve stem will adhere to some graphite materials on the surface during operation. As a result, the crawling of the valve stem and the insufficient sealing force of the sealed packing parts due to mass loss lead to the leakage of the medium; [0003] To sum up, how to avoid the mass loss of packing parts has become an urgent problem to be solved by the researchers of our company. Contents of the invention [0004] The technical problem to be solved by ...

AI Technical Summary

Problems solved by technology

[0002] The sealing packing of the valve under the condition of high temperature and normal pressure usually chooses the packing assembly composed of graphite and graphite packing, but this kind of packing sealing structure has some shortcomings in actual use, and the valve stem will adhere to some graphite materials on the surface during operation. As a result, the crawling of the valve stem and the insufficient sealing force of the sealed packing parts due to mass loss lead to the leakage of the medium;

Images