An Axial Flow Check Valve with Online Maintenance

Abstract

The invention discloses an online maintainable axial flow check valve which is characterized in that a top opening is formed in the top of a valve body, a valve spool component is placed into the valve body from the top opening, a valve cover is arranged at the top opening of the valve body to seal the valve body, a valve spool of the valve spool component is suspended on a valve spool support by a supporting rib, and the valve spool support is fixedly clamped at the top opening of the valve body by the aid of a valve spool fixing clamp ring. The online maintainable axial flow check valve is low in flow resistance and noise, and can realize online maintenance.

Description

technical field [0001] The invention relates to a check valve used in petrochemical, natural gas, nuclear power and other fields, more specifically a valve that is automatically opened or closed by the flow of the medium itself, and is mainly used to meet the requirements of the system for the return flow of the medium. check valve. Background technique [0002] In order to protect the safe operation of the compressor or pump, a check valve is generally installed at the outlet of the compressor or pump to prevent the medium from flowing backward. Ordinary swing and double-plate check valves often have discs that cannot be fully opened, causing problems such as unstable medium flow, large pressure loss, and loud noise, which affect the normal operation of large compressors or pumps. Due to its structural characteristics, good flow capacity, low pressure loss, and good anti-shock ability, the check valve can solve this problem well. [0003] At present, there are two kinds o...

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Problems solved by technology

[0004] One is that the disc-shaped structure is usually only suitable for small and medium-sized axial flow check valves. This is because the weight of the circular disc will increase greatly with the increase of the caliber. It is very difficult to close the valve. Although some manufacturers also increase the valve stem guide on the front side of the disc-shaped valve disc to solve the problem in the design of large-diameter valves, but the valve stem guide added on the front side of the valve disc has a corresponding The supporting structure will affect the flow capacity of the valve. At the same time, when the valve clack is closed, the structure will collide strongly and generate loud noise, which seriously affects the service life of the valve.

[0005] The second is the ring-shaped axial flow check valve, because the sealing surface is designed as an inner and outer ring, and the disc shape is a ring-shaped structure, the stress situation is improved, so that the thickness of the disc is less than that of other types of axial flow check valves. One-third of the thickness of the disc, the disc thickness is greatly reduced, especially for large-diameter valves, but because the disc is in a floating state, there is no precise guidance, and the sealing surface adopts double seals, when the medium backflow When it is not fast enough to form a certain impact on the valve disc and generate sufficient sealing specific pressure, the valve will often leak. At the same time, in actual use, the valve disc of this structure is supported by one or two guide pieces. In the long-term During the opening and closing process of the valve, it is very easy to break due to fatigue damage, and there is a great potential safety hazard

[0006] The third is that the axial flow check valves used in large-scale engineering projects, especially the large-diameter axial flow check valves, are usually installed in a welded connection with the pipeline. Once the valve leaks or the parts are damaged, it is necessary to replace the parts or seal For the axial flow check valve in the prior art, the whole valve must be cut off from the pipeline, and then repaired and replaced, which will inevitably cause huge economic losses

[0007] Practice has shown that although the axial flow check valves in the prior art have their own advantages, they also have great potential safety hazards. Once the valve leaks, it will inevitably cause huge economic losses to the entire project.

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