Quick-repair wash-free dual-valve-element shut-off valve convenient to replace

Abstract

The invention relates to the technical field of valves, and more particularly relates to a quick-repair wash-free dual-valve-element shut-off valve convenient to replace. The quick-repair wash-free dual-valve-element shut-off valve convenient to replace comprises a valve body, a valve base, a primary valve element, a limit disc, a secondary valve element, a valve base sleeve, a valve cover, a packing gland, a valve rod and a valve drive mechanism, wherein when the shut-off valve is in the opening and closing states, an assembling unit formed by the primary valve element, the limit disc and thesecondary valve element vertically move, free stroke set in the primary valve element enables the position of the primary valve element to be automatically corrected under the action of the fluid pressure, the secondary valve element does not apply pushing force on the primary valve element downward after the valve elements are all closed in place, the condition that one valve element influencesthe sealing performance of the other valve element is completely avoided, and the distance between a secondary valve sealing surface and a secondary sealing surface of the valve base is larger when the shut-off valve is in a micro-open state, so that the secondary valve sealing surface and the secondary sealing surface of the valve base are not damaged by the impact of water flow, and the integrity of the secondary valve element sealing surface is guaranteed to the greatest extent. According to the quick-repair wash-free dual-valve-element shut-off valve convenient to replace, the service lifeis long, the sealing effect is good, and maintenance and replacement are convenient.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to an easy-to-replace quick-repair type flush-free double-core stop valve. Background technique [0002] Valves are the most widely used equipment in piping systems, and are widely used in power plant water supply and sewage systems. The main seal of the traditional globe valve is composed of a valve core (disc) sealing surface and a valve seat sealing surface, and the valve seat is surfacing welded on the valve body by special materials. During the long-term use of the valve, the sealing surface of the valve core (disc) and the sealing surface of the valve seat will be damaged due to various reasons, such as impurities in the pipeline, valve internal leakage caused by improper operation or micro-opening damage when the valve is required to be slightly opened etc. Once damaged, internal leakage will occur immediately, which requires the entire valve to be removed from the pipeline f...

AI Technical Summary

Problems solved by technology

During the long-term use of the valve, the sealing surface of the valve core (disc) and the sealing surface of the valve seat will be damaged due to various reasons, such as impurities in the pipeline, valve internal leakage caused by improper operation or micro-opening damage when the valve is required to be slightly opened etc. Once damaged, internal leakage will occur immediately, which requires the entire valve to be removed from the pipeline for repair or replacement as a whole, which not only increases the cost of overhaul, maintenance and procurement, but also wastes a lot of system energy, resulting in greater economic losses. loss

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