High-pressure diaphragm valve provided with balance cavities

Abstract

The invention relates to a high-pressure diaphragm valve provided with balance cavities. The high-pressure diaphragm valve comprises a valve body assembly, a diaphragm and a driving assembly, wherein a valve seat is mounted in the valve body assembly; a valve rod is coaxially mounted at the top of the valve seat and is fixedly provided with the diaphragm; the diaphragm and a push rod of the driving assembly are fixedly arranged together; the valve body assembly comprises an upper valve body, a lower valve body and a right valve body; the upper valve body and the lower valve body are sealed and fixedly mounted; the edge of the diaphragm is pressed between the upper valve body and the lower valve body in a sealed manner, and the inside of the upper and lower valve bodies is divided into a balance cavity I and a fluid cavity I; the right valve body is fixedly mounted on one side of each of the upper and lower valve bodies; a membrane is mounted in the right valve body and divides the right valve body into a balance cavity II and a fluid cavity II; a working fluid inlet is formed in the right valve body and is communicated with the fluid cavity I and the fluid cavity II; a working fluid outlet is formed in the bottom of the lower valve body and communicated with the fluid cavity I. The high-pressure diaphragm valve provided with the balance cavities has the advantages of simple structure, scientific and reasonable design, ingenious conception, small size, high control sensitivity and long service life, is particularly suitable for controlling a high-pressure fluid and has wide popularization and application value.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a high-pressure diaphragm valve with a balance chamber. Background technique [0002] Diaphragm valve is a valve with a flexible diaphragm installed inside, which has been widely used in various fields. Compared with other types of valves, the diaphragm valve can separate the fluid passage and the driving part, which not only ensures the purity of the working fluid, but also prevents the corrosion of the working parts and the pollution of the environment due to fluid leakage. [0003] Existing ordinary diaphragm valves are not suitable for controlling high-pressure fluids for two reasons: First, there are many driving modes for diaphragm valves, and the common one is pneumatic. Due to the structural characteristics of the diaphragm valve, when the pressure of the fluid to be controlled is high, the side of the diaphragm with the working fluid is subjected to a large force, which requires a...

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Problems solved by technology

[0005] Through comparison, it is found that the diaphragm valve in the above-mentioned publication has not yet effectively solved the application in high-pressure fluid, and is quite different from the technical solution of this patent application.

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