Multistage clearance throttling pressure adjusting valve

Abstract

The invention discloses a multistage clearance throttling pressure adjusting valve and relates to the technical field of fluid pressure control. The multistage clearance throttling pressure adjustingvalve comprises a valve body, a valve seat connected in the valve body in a sealed manner, a valve element contained in the valve seat and a push rod driving the valve element to move in the longitudinal direction of a valve seat runner. The valve seat is provided with at least three flange step limiting radial gradual change cavities arranged in the longitudinal direction of the valve seat, the valve element is provided with at least three flange step limiting radial change parts arranged in the axial direction of the valve element, and the radial gradual change cavities are matched with theradial gradual change parts. A buffering face is formed on the axial end face of a flange step in the medium flowing direction of the runner. By means of the multistage clearance throttling pressure adjusting valve, the regularly changing zigzag runner is formed by the radial gradual change parts arranged on the valve element and the radial gradual change cavities formed in the valve seat. The buffering purpose is achieved through the classified axial end faces of the radial gradual change parts, pressure is reduced stably stage by stage damage to the valve element and the valve seat is small,the service life of the valve is prolonged effectively, machining is easy, and the applicable pressure range is large.

Description

Technical field [0001] The invention relates to the technical field of fluid pressure control, in particular to a multi-level gap throttling pressure regulating valve. Background technique [0002] In the pressure testing industry, the reliability and stability of testing equipment largely depend on the working life of various control valves. Due to the high pressure, the control valve opens and closes frequently, and the valve core is damaged by the impact of high pressure. The service life of various high pressure and ultra high pressure valves is generally not particularly high. With the increasing requirements for the reliability and stability of high-pressure valves, it is necessary to make some adjustments in the traditional valve structure to achieve the effect of extending the service life of the valve. [0003] The Chinese utility model patent with the patent application number CN97221570.0 discloses a labyrinth-type high differential pressure flow regulating valve. The v...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problems of short service life, small applicable pressure range and high processing difficulty of existing valves. The present invention provides a multi-stage gap throttling and pressure regulating valve. It forms a regularly changing tortuous flow path with the radial gradient cavity in the valve seat, and uses the graded axial end faces of the radial gradient to achieve the purpose of buffering, gradually reducing the pressure steadily, with little damage to the valve core and seat, and effectively extending the service life of the valve. Long service life, easy processing and wide pressure range

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