Anti-scouring high-pressure adjusting valve capable of achieving sealing and adjusting staggering and flow adjusting method of anti-scouring high-pressure adjusting valve

Abstract

The invention relates to an anti-scouring high-pressure adjusting valve capable of achieving sealing and adjusting staggering. The anti-scouring high-pressure adjusting valve comprises a valve body and a staggered opening and closing structure; the staggered opening and closing structure comprises a valve cover and a valve rod which are arranged in the valve body, a valve cage is provided with a plurality of throttling windows, and a valve clack ascends and descends along with the valve rod to enable the lower side end of an upper adjusting pair to be matched with the throttling windows so as to adjust the flow of a medium in a flow channel; and the outer wall of the lower end of a lower sealing pair of the valve clack is provided with a sealing face A matched with the valve seat in a sealing manner, the inner wall of the upper end of the valve seat is provided with a sealing face B matched with the sealing face A, and the outer wall of the upper adjusting pair is provided with a plurality of flow balance holes. The anti-scouring high-pressure adjusting valve has the following advantages that by means of the structural form that sealing and flow adjustment are staggered among the valve clack, the valve cage and the valve seat, washing of media to the sealing faces is avoided, and meanwhile the pressure in a cage cover is balanced, so that the stability of vertical lifting operation of the valve rod is guaranteed.

Description

Technical field: [0001] The invention belongs to the field of regulating valves, and in particular relates to a staggered anti-scouring high-pressure regulating valve for realizing sealing and regulating. Background technique: [0002] In the automatic control of modern electric power industry and chemical enterprises, the regulating valve plays a very important role. The production of modern electric power industry and chemical enterprises depends on the correct distribution and control of the flowing medium. In the automatic control system, the regulating valve withstands Working conditions such as temperature, pressure, corrosion and pollution are more serious than other components, but when it controls the flow of process fluid, it must require stable operation and a minimum amount of maintenance. Small flow and high pressure differential regulating valves are widely used in power stations or petroleum fields. Due to the high pressure differential and low flow working en...

AI Technical Summary

Problems solved by technology

Small flow and high pressure difference regulating valves are widely used in power stations or petroleum fields. Due to the high pressure difference and small flow working environment, the sealing surface of the valve body is subjected to flashing and cavitation, and the service life is short, which seriously affects the normal operation of the equipment.

[0003] Patent No. 201320175100.9 is an isolated regulating valve, and Patent No. 201320175146.0 is a high-pressure globe valve with a built-in packing gland. The valve disc (valve core) at the lower end of the valve stem and the valve seat form a sealing fit, and the lower end of the valve disc is the sealing surface. A. The upper end of the valve seat is the sealing surface B. With the downward drive of the actuator, the valve stem makes the sealing surface A of the disc at the lower end of the valve stem coincide with the sealing surface B of the valve seat, blocking the medium inlet and medium from the valve body. When the valve stem is driven upwards with the actuator, the sealing surface A of the valve disc at the lower end of the valve stem is separated from the sealing surface B, and the cover of the throttling area of ​​the valve seat is gradually canceled through the rise of the valve disc, so that the medium Through the medium inlet, the throttling window is discharged to the medium outlet, so the opening and closing of the medium circulation and the flow adjustment depend on the lower end of the valve disc. When the medium is discharged to the medium outlet through the valve seat, it is throttled, and the relative flow speed is relatively fast. A. The scouring of the sealing surface B is extremely large, causing blowing damage to the sealing surface A and sealing surface B. The high-pressure regulating valve is opened and closed many times for a long time, which affects the sealing performance between the sealing surface A and the sealing surface B, and then affects the high-pressure adjustment. Valve life and normal operation

[0004] Secondly, when the medium flows to the cage, the pressure is extremely high. Once the medium passes through the gap between the disc and the cage and flows to the upper end of the cage, since the bulk modulus of the working medium is large enough, the small volume can The upper end of the valve disc produces a huge pressure, and the lower end of the valve disc generates a relatively small pressure due to the throttling of the medium, so that a large pressure difference appears between the upper and lower ends of the valve disc, which makes the valve stem fluctuate up and down during the opening and closing process, affecting the valve. The stability of the normal lifting of the rod

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