Double-core double-seat wash-free stop valve

Abstract

The invention discloses a double chip and double seat checking-valve without washing, which is characterized by the following: comprising gland, access flow passage, outlet flow passage and valve body of valve seat; connecting bottom end of valve rod A (1)to valve chip A (2)as the gland structure; penetrating valve rod B (3)through the hole in the valve chip A (2); connecting spring (4)to valve chip B (5); connecting one end of valve rod C (6)to the valve chip A (2); connecting the other end to valve chip C (7). This invention possesses the advantages of long age and simple structure.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a stop valve. Background technique [0002] Existing high-temperature and high-pressure globe valves usually have a single-core, single-seat sealing structure. When the valve is opened and closed, the sealing surface is easily washed by high-speed fluid, so the service life is short. In order to solve this problem, Chinese Patent Publication No. CN1614267 disclosed a kind of invention titled "Double-core double-seat non-scouring stop valve" on May 11, 2005, which is realized by the disc guard and the valve disc (spool). Double sealing, but because the valve disc guard "like a circular gate first gradually cuts off the outlet channel to block the fluid", the valve disc guard and the inner cavity of the valve have a matching gap to produce a small amount of leakage, which requires the valve disc and Only when the valve seat on the valve body is closed can a complete seal be realized. It can ...

AI Technical Summary

Problems solved by technology

[0002] Existing high-temperature and high-pressure globe valves usually have a single-core, single-seat sealing structure. When the valve is opened and closed, the sealing surface is easily washed by high-speed fluid, so the service life is short

In order to solve this problem, Chinese Patent Publication No. CN1614267 disclosed a kind of invention titled "Double-core double-seat non-scouring stop valve" on May 11, 2005, which is realized by the disc guard and the valve disc (spool). Double sealing, but because the valve disc guard "like a circular gate first gradually cuts off the outlet channel to block the fluid", the valve disc guard and the inner cavity of the valve have a matching gap to produce a small amount of leakage, which requires the valve disc and The valve seat on the valve body is closed to achieve complete sealing. It can be seen that the process of achieving complete sealing is relatively long, and the flow of fluid cannot be completely blocked immediately.

"The outer circle of the disc guard fits with the round hole in the inner cavity of the valve..." There are many parts that need to be matched, so the processing and assembly requirements are high, and the structure is complex

Moreover, the existing globe valve body is usually a cylinder, with a large amount of material and high production costs.

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