Structure with improved pressure reducing function and valve seat surfacing surface protecting function

Abstract

The invention discloses a structure with an improved pressure reducing function and a valve seat surfacing surface protecting function. The structure includes a valve element and a valve seat; the valve element is composed of upper, middle and lower valve element sections, a valve element hole is formed in the valve seat, the lower valve element section is of a conical structure with the gradually-decreased outer diameter, a plurality of conic pressure reducing grooves which are arranged at equal intervals are arranged on the outer conic surface of the lower valve element section, the conic pressure reducing grooves and the outer conic surface are in equal conic angle design, and gaps increased gradually are formed between notches of the conic pressure reducing grooves and the inner circumferential surface of the valve element hole of the valve seat; and a first surfacing surface is arranged on the outer conic surface of the middle valve element section, a second surfacing surface is arranged on the inner circumferential surface of the valve element hole of the valve seat, and the first surfacing surface is matched with the second surfacing surface to form a valve sealing face. Bymeans of the structure, the conic pressure reducing grooves are arranged, the conic pressure reducing grooves and the outer conic surface are in equal conic angle design, and step-by-step pressure reducing is carried out, so that scouring of media on the surfacing surfaces under various pressure levels is weakened, and the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a structure with an improved decompression function and protection of the surfacing welding surface of a valve seat. Background technique [0002] For a long time, thermal power generation has played a pivotal role in national energy development. As the core of thermal power plants, the boiler system is crucial to its safe operation. Valves are important control components in the boiler water supply system. It directly affects the operation of the whole unit. With the continuous improvement of the parameters of thermal power units in my country, the requirements for the reliability and service life of valves are also getting higher and higher. [0003] For a valve with a large pressure difference, in order to enhance the overall decompression effect of the valve and avoid damage to the valve by cavitation, a multi-section rectangular throttle groove 1a will be set at the lower en...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a structure with an improved decompression function to protect the surfacing surface of the valve seat in view of the problem of "garbage jamming" existing in the existing valves, which causes the surfacing surface to be easily worn. By adding a number of conical grooves that are equidistant and designed at the same cone angle as the conical structure, the garbage hidden in the throttling groove will be taken away through the flow of the medium, so as to protect the surfacing layer and prolong the service life of the valve.

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