A packing self-sealing component and method thereof for ultra-low temperature conditions

Abstract

The invention discloses a packing self-sealing assembly and a method thereof for ultra-low temperature conditions, comprising a valve cover, a first pressure plate and a self-sealing module, the valve cover is fixedly sleeved on the valve stem of the target valve body, and the valve cover The upper part of the inner wall surrounds the valve stem with an annular first groove, and the self-sealing module is located in the first groove; the self-sealing module includes a packing, a gasket, a spring, a second pressure plate and a throttle that are arranged in sequence from top to bottom. The components are all coaxially sleeved on the outside of the valve stem; the diameter of the throttling passage gradually decreases along the direction from the air inlet hole to the air outlet hole, so that the fluid in the throttling passage can be turned into gas through throttling and depressurization. The invention utilizes the throttling and pressure-reducing effect of the ultra-low temperature fluid medium, effectively realizes the self-sealing performance of the packing, and ensures that the temperature of the sealing packing is always above 0°C; at the same time, the self-sealing component also prevents the packing when the target valve body is not working Still in the state of tightening the seal, thus prolonging the service life of the packing.

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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