Sealing ring for valve base of high-pressure double-piston combination type normal temperature ball valve

Abstract

The invention discloses a sealing ring for a valve base of a high-pressure double-piston combination type normal temperature ball valve. The sealing ring comprises two sealing assemblies arranged in alongitudinal symmetry manner. A check ring is arranged between the two sealing assemblies. Each sealing assembly comprises a U-shaped tetrafluoromethane clamping sleeve, a V-shaped sheet-like springand a T-shaped pressing ring. A U-shaped ring groove is formed in the top face of each U-shaped tetrafluoromethane clamping sleeve. Each U-shaped tetrafluoromethane clamping sleeve comprises two innerbuckling type lips which are located at the two ends and distributed symmetrically. Each V-shaped sheet-like spring is installed in the corresponding U-shaped ring groove and clamped through the corresponding inner buckling type lips. Each T-shaped pressing ring abuts against the corresponding V-shaped sheet-like spring. The width of the cross section of the top end of each T-shaped pressing ringis equal to that of the cross section of the check ring. According to the sealing ring, the two sealing components arranged in a longitudinal manner are adopted, by means of the back-to-back bidirectional installing manner of the check ring, long-time pressing on the sealing ring is achieved, the lips are protected effectively, impurities in a pipeline are stopped from entering the sealing ring,and sealing can be achieved no matter which end media are from.

Description

technical field [0001] The invention relates to the technical field of sealing rings, in particular to a high-pressure double-piston combined normal temperature ball valve seat sealing ring. Background technique [0002] In my country, ball valves are widely used in petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal, steel and other industries, and occupy a pivotal position in the national economy. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to be rotated 90 degrees and a small rotational torque can be closed tightly. The ball of the ball valve is fixed and does not move after being pressurized. Fixed ball and ball valves are equipped with floating valve seats. After being subjected to medium pressure, the valve seat moves, so that the sealing ring is pressed tightly on the ball to ensure the sealing. ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, several O-ring grooves are opened on the valve seat holder for the normal temperature ball valve seat, and the O-ring is used for sealing. However, the normal temperature ball valve seat has two sealing surfaces, and conventional sealing rings cannot bear the pressure for a long time. , the service life is short and easy to break; the lip of the conventional sealing ring is not protected, and it is more likely to be damaged by the medium pressure for a long time; if there are impurities in the pipeline, it is easy to be blocked by impurities, resulting in the sealing ring not working properly

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