Multi-stage depressurization small-flow regulating valve

Abstract

A multi-stage pressure reduction small-flow regulating valve is formed by assembling a valve deck, a valve element, a sleeve and a valve seat on a valve body. A channel between the valve core and the valve seat has a certain taper, so that the outlet area of the channel is increased along with the increase of the opening degree of the valve core; a series of valve seat grooves distributed at intervals in the longitudinal direction are formed in the inner side wall, serving as one side wall of the channel, of the valve seat in the outlet direction of the channel and used for reducing the average pressure of fluid on the section perpendicular to the flowing direction of the fluid step by step. According to the embodiment, under the liquid working condition, when high-pressure-difference liquid passes through the channel between the valve element and the valve seat, the step-by-step pressure reduction effect can be generated, the pressure of each stage is higher than saturated vapor pressure, the cavitation phenomenon is avoided, meanwhile, the average flow speed of fluid is reduced, scouring of the high-pressure-difference liquid to the valve element and the valve seat is reduced, and the service life of the valve element and the valve seat is prolonged. The service life of the valve core is prolonged. When used under gas working conditions, the principle is similar to that under liquid working conditions, and noise is greatly reduced.

Description

technical field [0001] The embodiments of the present application relate to the technical field of regulating valves, in particular to a multi-stage pressure-reducing small flow regulating valve. Background technique [0002] The traditional small flow regulating valve is assembled on the valve body by the valve cover, the valve core, the sleeve and the valve seat. Among them, when the traditional small flow regulating valve is in the liquid condition, the high pressure difference liquid will generate a very high flow rate when it flows through the channel between the valve core and the valve seat, and cavitation will occur when the pressure is reduced to the saturated vapor pressure. This will cause the spool to quickly become damaged and unusable. However, under the gas working condition, when the gas with a very high flow rate passes through the channel between the valve core and the valve seat, a lot of noise will be generated, which is difficult to meet the use require...

AI Technical Summary

Problems solved by technology

Among them, when the traditional small flow regulating valve is in the liquid condition, the high pressure difference liquid will generate a very high flow rate when it flows through the channel between the valve core and the valve seat, and cavitation will occur when the pressure is reduced to the saturated vapor pressure. This will cause the spool to break down quickly and become unusable

However, under gas working conditions, when the gas with a very high flow rate passes through the passage between the valve core and the valve seat, a lot of noise will be generated, which is difficult to meet the use requirements.

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