Flash evaporation prevention valve

Abstract

The invention relates to an anti-flash evaporation valve, belonging to the valve field, which is characterized in that the anti-flash evaporation structure of the valve is composed of at least two layers of sleeves arranged between a valve clack and a valve body. The circumferential walls of the inner and outer sleeves are respectively opened with a throttle window, and the arrangement between the inner and outer sleeves is mutually staggered at a certain angle. The invention has the advantages of that the processing assembly technology of the sleeve is much simpler than the existing labyrinth anti-flash evaporation structure, and the pressure reducing effect and the anti-flash evaporation capacity are much stronger than the foreign multi-layer sleeve anti-flash evaporation structure and are basically equal to the labyrinth anti-flash evaporation structure. Therefore, the invention can be widely used in the places which have the high differential pressure and easily generate the flash evaporation and cavitation erosion in order to protect valves, pipelines and other equipments.

Description

technical field [0001] The invention belongs to valves, and in particular relates to an improvement of an anti-flash structure of an anti-flash valve. Background technique [0002] When the liquid medium passes through the valve and its outlet pressure is equal to or lower than the vapor pressure of the liquid, part of the liquid medium will turn into vapor, so that the velocity of the medium passing through the valve will continue to increase until blocking flow occurs. On the one hand, this blocked flow will reduce the flow capacity of the valve due to the presence of a large amount of vapor in the medium. On the other hand, the velocity of the liquid droplets in the high-velocity blocked flow tends to be close to the high velocity of the vapor, and the droplets impact the surface of the material inside the valve. , so that the material is damaged and falls off. At the same time, this flashing can also cause excessive noise and vibration, which can damage pipes and other e...

AI Technical Summary

Problems solved by technology

[0005] 1. Although the labyrinth can effectively reduce the pressure, the processing technology is complicated, and the complex and tortuous flow channel curve must be obtained through special processes. In order to meet the flow requirements, a combination of multiple discs is usually required. The combination of discs Fixing also requires special workmanship

Therefore, its disadvantage is that the manufacturing process is too complicated

[0006] 2. The advantage of the multi-layer sleeve type is that the structure is relatively simple, and the processing of the parts is relatively easy, but how to ensure the proper angle of rotation between the layers during installation is a difficult problem. Relying on manual operation is easy to greatly reduce the final effect, and , its step-down effect is not very good, not suitable for occasions with high pressure difference

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