Pressure reducing throttle valve

Abstract

The invention provides a pressure-reducing throttling valve (100) which is arranged in a fluid channel and is in a closed state for blocking the fluid channel and an open state enabling fluid in the fluid channel to flow through. The pressure-reducing throttling valve (100) comprises a valve seat limiting at least part of a valve cavity and a valve core (10) capable of moving in the valve cavity. The valve core (10) is provided with multistage bodies sequentially arranged along the flowing direction (F) of the fluid, each body limits a throttling surface, and the valve seat limits a plurality of valve seat throttling surfaces surrounding throttling surfaces of the corresponding bodies. When the valve is in the open state, the throttling surfaces of the multistage bodies and the corresponding valve seat throttling surfaces limit multistage throttling channels (11, 12, 13 and 14) extending among the throttling surfaces of the multistage bodies and the valve seat throttling surfaces, and each of the multistage throttling channels is structured to be tapered along the flowing direction. The volume flow rate of the multistage throttling channels (11, 12, 13 and 14) is decreased step-by-step along the flowing direction.

Description

technical field [0001] The present invention relates to a fluid pressure and flow regulating device, especially a pressure reducing and throttling valve. Background technique [0002] In order to realize the pressure and flow regulation of the fluid, various pressure reducing and throttling valves have been developed. In the prior art, a one-stage or two-stage valve with a small throttle section (micro-flow valve) is usually used to adjust the flow rate and pressure of the fluid passage, but such valves are usually not suitable for use under high pressure. This is mainly because when the valve is opened, the vapor pressure of the high-pressure fluid will form a strong cavitation effect, which will cause rapid wear of the internal parts of the valve, such as cavitation, and frequent replacement of corroded parts. [0003] Therefore, there is a need for a pressure-flow regulating system, especially a pressure-reducing throttle valve, which is suitable for use in a high-pressu...

AI Technical Summary

Problems solved by technology

In the prior art, the flow and pressure of the fluid passage are usually adjusted by a one-stage or two-stage small throttle valve (micro-flow valve), but such valves are usually not suitable for use under high pressure

This is mainly because when the valve is opened, the vapor pressure of the high-pressure fluid will form a strong cavitation effect, which will cause rapid wear of the internal parts of the valve, such as cavitation, and frequent replacement of corroded parts

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