Elastic sealing flooding plug structure

Abstract

An elastic sealing flooding plug structure comprises a sphere, a limiting block, a flooding plug and a fixer, wherein the flooding plug consists of an outer lip and an inner spring energy storage ring, the flooding plug is embedded in a mounting groove of the fixer, the limiting block is fixedly connected with the fixer, the limiting block abuts against the flooding plug, and the outer lip of theflooding plug abuts against the surface of the sphere. The elastic sealing flooding plug structure has the beneficial effects that under the ultra-low temperature working condition, although the shrinkage rates of the flooding plug and the fixer are not consistent, the gap between the flooding plug and the fixer can be made up through the spring energy storage ring inside the flooding plug, so that the leakage risk of the flooding plug and the fixer is eliminated, and the tightness of the valve is ensured.

Description

technical field [0001] The invention relates to an elastic sealing pan-seal structure. Background technique [0002] As a new energy source, LNG has broad development prospects. In recent years, with the involvement of energy companies such as PetroChina, Sinopec, and CNOOC in the LNG industry, more and more LNG receiving stations have been built in China, and a large number of cryogenic valves have been used in LNG receiving stations to realize LNG transportation. [0003] At present, ultra-low temperature ball valves account for more than 80% of the total cryogenic valves in LNG receiving stations, but the existing low temperature ball valves mostly use high molecular polymers such as PCTFE embedded in metal holders to achieve the seal between the ball and the valve seat. The structure specifically includes spheres, polymers such as PCTFE, springs, and fixers. When the valve works under low temperature conditions, because the linear expansion coefficient of high molecula...

AI Technical Summary

Problems solved by technology

When the valve is opened or closed, the force generated by the rotation of the ball will drive the polymer such as PCTFE to move in the holder, thereby forming a leakage channel, which will cause internal leakage of the valve

Images