Novel two-sided sealing structure

Abstract

The new double-sided sealing structure is composed of valve disc, valve seat, adjusting ring and so on. The valve adopts a reverse flow (top in and bottom out) structure, and the annular sealing surface starts to throttle, blocking solid particles from entering the sealing surface of the valve disc and the cone surface of the valve seat; an annular space is formed between the top of the lower adjustment ring and the lower plane of the valve disc , adjust the space through the lower adjustment ring to obtain a suitable opening pressure; the sealing surface of the valve seat and disc adopts advanced plasma spray welding or surfacing welding cobalt-chromium-tungsten carbide technology; the adjustment sleeve is used to adjust the back of the valve Pressure, the lower cone and the exhaust chamber form a regulating body, the adjustment sleeve is adjusted up to reduce the back pressure of the valve, and the adjustment sleeve is lowered to increase the back pressure of the valve.

Description

Technical field [0001] The invention relates to a novel double-sided sealing structure, which is especially applied to sealing joints with a lot of medium impurities. Background technique [0002] At present, the high-temperature and high-pressure globe valves for sewage drainage and drainage used in industries such as electric power, petrochemical, and metallurgy have mostly flat or conical sealing structures, and there is no secondary sealing structure. There is a relatively serious internal leakage phenomenon, especially in the power system. Its sewage system and drainage system are at the initial stage of boiler start-up, especially during the start-up process of a new unit or a unit after overhaul, the solid particles contained in the medium (rust, welding impurities, welding spatter, gas cutting spatter, scale and pipes or headers) debris), when the valve is closed or opened, solid particles are easily mixed between the sealing surfaces, resulting in crushing and lax ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the existing sealing structure contains a lot of solid particles in the dense medium, when the valve is closed or opened, the sealing surface is easily mixed with solid particles to cause pressure damage and the valve is not closed tightly. Double-sided sealing structure, this new type of double-sided sealing structure has good sealing performance, improves the ability to resist impurities, and improves work reliability

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