Packing self-sealing assembly used under ultra-low temperature working condition and method thereof

Abstract

The invention discloses a packing self-sealing assembly used under an ultra-low temperature working condition and a method thereof. The assembly comprises a valve deck, a first pressing plate and a self-sealing module, wherein a valve rod of a target valve body is fixedly sleeved with the valve deck, an annular first groove is formed in the upper portion of the inner wall of the valve deck and isaround the valve rod, the self-sealing module is located in the first groove, the self-sealing module comprises a packing, a gasket, a spring, a second pressing plate and a throttling element which are sequentially attached from top to bottom and coaxially sleeve the valve rod, the diameter of a throttling channel is gradually reduced in the direction from an air inlet hole to an air outlet hole,so that fluid can be changed into gas in the throttling channel through a throttling and depressurizing effect. According to the assembly, the throttling and depressurizing effect of an ultra-low-temperature fluid medium is utilized, the self-sealing performance of the packing is effectively realized, a temperature of the sealing packing is always 0 DEG C or above, and meanwhile, the self-sealingassembly also prevents the packing from being still in a tight sealing state when the target valve body does not work, so that the service life of the packing is prolonged.

Description

technical field [0001] The invention belongs to the field of valve devices, and in particular relates to a stuffing self-sealing component used in ultra-low temperature conditions and a method thereof. Background technique [0002] With the vigorous development of liquefied natural gas (LNG), there are more and more fluid control equipment on LNG receiving stations and transportation equipment, especially ultra-low temperature valves, as an indispensable device for the fluid pipeline of LNG receiving stations and transportation equipment, often Work at ultra-low temperature. The sealing device is an important part of the valve, and its sealing performance determines the quality of the valve. For valves working under ultra-low temperature conditions, the sealing structure of the valve is easily affected by the low-temperature medium, and each part of the valve is easily affected by cold shrinkage, which will cause the sealing structure of the valve to deform or even be damag...

AI Technical Summary

Problems solved by technology

[0003] With the development of technology, the industry has put forward more stringent requirements for sealing. Frequent replacement, disassembly and replacement of sealing packing will cause an increase in maintenance costs. In order to save maintenance costs, the current research on valve sealing not only requires high reliability of sealing, but also requires Has a long working life

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