Stop valve

Abstract

The invention provides a stop valve. The stop valve comprises a valve body, a valve element assembly, a temporary liquid storing cavity and a one-way backflow structure, wherein the valve body is provided with a closed work cavity, and the work cavity is provided with a first interface, a second interface and an installation hole; the valve element assembly comprises a valve rod installed in the installation hole, and a first valve clack arranged on the valve rod, and the first valve clack moves along with the valve rod to be communicated with or close the first interface and the second interface; the temporary liquid storing cavity is a sealed cavity which is formed outside the work cavity, and the sealed cavity has a position where the valve rod is matched with the installation hole; the one-way backflow structure is used for being unidirectionally connected with a channel from the temporary liquid storing cavity to the work cavity. Due to the arrangement of the temporary liquid storing cavity and the one-way backflow structure, the problem that in the prior art, residual liquid of a radioactive liquid medium remains after corrugated pipe is fractured is avoided, and the risk and hazard that people are irradiated when the stop valve is replaced and maintained are reduced. Meanwhile, the radioactive level of the stop valve is reduced, so that the requirements for facility maintenance and replacement are reduced, the building cost of devices, workshops and the like is saved, and the stop valve has very great economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of pipeline connectors, in particular to a shut-off valve. Background technique [0002] At present, the bellows stop valve using stainless steel bellows as the sealing element has the advantage of "zero leakage", so it is widely used in the process pipelines of nuclear facilities such as nuclear fuel reprocessing plants. [0003] Chinese Publication No. CN103244696A patent provides a valve stem non-rotating external pressure bellows stop valve, which consists of valve body, valve core, special metal bellows, valve seat, valve cover, flange, packing, valve stem, It is composed of adjusting parts, valve stem nuts, shaft sleeves, etc. The a-end of the special metal bellows is welded and sealed with the end of the valve core, the b-end of the special metal bellows is welded and sealed with the flange, and the end of the valve core is threaded with the valve stem to form a corrugation Pipe assembly; put it in t...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the bellows stop valve in the prior art, such as the difficulty of maintenance and the increase in cost caused by the failure of the bellows, and the defects that the leakage of radionuclides will cause harm to the operator, thereby providing a Globe valve parts

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