Throttling serial type multistage pressure reduction and adjustment valve

Abstract

The invention provides a throttling serial type multistage pressure reduction and adjustment valve. A valve rod and a valve element assembly are arranged inside a valve body; a valve seat assembly is provided with multistage pressure reduction units, and each stage of pressure reduction unit of the valve seat assembly is composed of a cylindrical fluid expansion unit and a throttling unit, wherein the throttling unit is shaped like a circular truncated cone, and the area of the throttling unit decreases gradually; correspondingly, the pressure reduction units are arranged on corresponding positions of the valve element assembly, wherein the stage number of the pressure reduction units in the valve element assembly is equal to that of the pressure reduction units in the valve seat assembly; each stage of the pressure reduction unit of the valve element assembly is composed of a bowl-shaped molded surface for controlling flow and a cylindrical shrinkage unit; the upper portion of the valve element assembly is provided with valve elements, and the lower portion of the valve element assembly is provided with guide rods; valve bottom drainage holes are formed in the positions, located on the outer sides of valve seat guide holes, of the bottom of the valve seat assembly; a flow diversion sleeve is arranged on the top of the valve seat assembly, and a flow diversion hole is formed in one side of the flow diversion sleeve. According to the throttling serial type multistage pressure reduction and adjustment valve, the service life of the valve can be prolonged, vibration and noise of pipelines behind the valve can be eliminated, and it is guaranteed that the adjustment accuracy of the valve is high and operation is stable under the working condition that the pressure difference is large and solid particles exist in media in the Texaco process of coal chemical industries.

Description

technical field [0001] The invention is mainly applied to the pressure / flow regulation in the Texaco process of the coal chemical industry, and is especially suitable for the return flow control from the outlet of the high-pressure gray water pump to the deaerator. The medium of this station contains a certain amount of solid particles, and the pressure difference of the valve is relatively large. , precise control of pressure / flow requirements. Background technique [0002] Texaco process is one of the mainstream processes in the coal chemical industry. At a specific station, the pressure difference of the valve is relatively large, and there is a certain solid content in the medium. At present, the single-seat angle throttle valve is commonly used under this working condition, but the service life is short, mainly because the pressure difference makes the liquid medium easy to cavitate, and the cavitation releases a large amount of energy to cause damage to the valve trim...

AI Technical Summary

Problems solved by technology

Chinese patent 201320464491.6 discloses a regulating valve for Texaco technology. Although it has two stages of decompression with a valve core and a sleeve, there are two main problems in this valve: one is that the sleeve is used as the second stage when the opening is small. The decompression effect is not obvious. Second, under the condition of large pressure difference, the two stages cannot effectively eliminate cavitation, and the internal parts are still seriously damaged by cavitation.

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