A multi-stage pressure reducing valve

Abstract

The invention provides a multi-stage reducing valve which comprises a left valve body, a right valve body, a valve rod and a guide tube. The guide tube is fixedly connected to the left valve body through a shaft base, the valve rod radially penetrates through the guide tube to be fixed in the shaft base, the section of the valve rod located in an inner cavity of the guide tube is connected with a shifting fork, a multi-stage sleeve is connected with a port of the guide tube, a piston cylinder is arranged in the inner cavity of the guide tube and the multi-stage sleeve, the piston cylinder, the multi-stage sleeve and the guide sleeve are located on the same axis, a piston rod is fixedly connected at the axis position of the piston cylinder, the front section of the piston rod is fixedly connected with a pin shaft, the pin shaft is connected with the shifting fork in a matching mode, and a plurality of reverse horn taper holes are formed in the multi-stage sleeve. The multi-stage reducing valve is good in stability and is not prone to generate flash and cavitation. A pressure reducing sleeve with different stages can be designed according to pressure difference of a process system. The aim of pressure reduction can be achieved.

Description

technical field [0001] The invention relates to a valve, in particular to a multi-stage decompression valve. Background technique [0002] The pressure reducing valve is to reduce the inlet pressure to a certain required outlet pressure by adjusting, so as to provide a certain pressure lower than the fluid pressure on the inlet side. At present, in the fluid delivery system, the decompression method usually adopts one-stage throttling, which uses the relative position between the conical disc and the circular orifice to change the throttling area, so that the flow velocity and fluid kinetic energy change, resulting in different Pressure loss, so as to achieve the purpose of decompression. The pressure reducing valve with one-stage throttling is not suitable for high pressure conditions, and the valve core structure of this type of pressure reducing valve matches the conical disc and the circular orifice, the lateral force is unbalanced, and the throttling stability is not s...

AI Technical Summary

Problems solved by technology

The pressure reducing valve with one-stage throttling is not suitable for high pressure conditions, and the valve core structure of this type of pressure reducing valve matches the conical disc and the circular orifice, the lateral force is unbalanced, and the throttling stability is not stable. Well, cavitation is easy to occur under high pressure, which makes the valve trim prematurely damaged

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