Metal rigidity seal ball valve

Abstract

The invention discloses a metal rigidity seal ball valve which comprises a valve, a valve seat, a valve stem and a ball. The ball is positioned in a ball cavity in the valve; the valve seat comprisesa left valve seat and a right valve seat, the left valve seat and the right valve seat are symmetrically arranged on two sides of the ball, and scraper mechanisms are arranged at the positions, whichare butted to the ball, of the valve seat; seal surfaces between the valve seat and the valve are in the shapes of multiple levels of steps which are matched with one another, and a first sealing assembly is arranged between every two corresponding seal surfaces; each first seal assembly comprises a first elastic component, a clamping component and a first seal ring; the clamping components are provided with L-shaped axial sections, two ends of each first elastic component are butted to the valve and a vertical arm of the corresponding L-shaped clamping component, a corner of each L-shaped clamping component is clamped on one of the levels of steps of the corresponding seal surface of the valve seat, the first seal rings are mounted between the tail ends of transverse arms of the L-shapedclamping components and the seal surfaces of the valve seat, and metal protection layers are arranged on the seal surfaces of the valve and are positioned on the outer sides of the first seal rings. The metal rigidity seal ball valve has the advantages that seal structures on the seal surfaces are improved, accordingly, seal effects can be enhanced, the service lives of seal components can be prolonged, elastic components can be protected, and the metal rigidity seal ball valve is particularly applicable to working conditions with crude oil used as a medium.

Description

technical field [0001] The invention relates to the technical field of metal hard-sealed ball valves, in particular to a metal-hard-sealed ball valve suitable for crude oil medium. Background technique [0002] With the development of industrialization, the requirements for valves are getting higher and higher. Ball valves use spheres as the opening and closing parts, which have the advantages of small flow resistance, small pressure loss, reliable sealing, and easy operation, and are trusted by customers, and are widely used in oil and gas pipelines. [0003] In the case of crude oil, there are solid particles and acidic elements. For conventional ball valves, the sealing surface of the valve seat is generally made of soft materials, but for crude oil containing hard solid particles, fine particles in the medium are easily bonded to the spherical surface to form scaling, and these particles will enter the spherical surface and the valve seat during the valve switch process...

AI Technical Summary

Problems solved by technology

For conventional ball valves, the sealing surface of the valve seat is generally made of soft materials, but for crude oil containing hard solid particles, fine particles in the medium are easily bonded to the spherical surface to form scaling, and these particles will enter the spherical surface and the valve seat during the valve switch process. Between the sealing surfaces, it will cause continuous wear to the sealing surface, destroy the sealing performance of the valve, and cause leakage of the sealing surface; seal leak

In addition, due to the sulfur content in crude oil, it has a corrosive effect on pipelines, and the sealing area of ​​the valve is exposed to acidic conditions for a long time, which will also be corroded, the sealing performance of the valve will also be reduced, and the service life of the valve will be reduced, resulting in frequent maintenance and high maintenance costs

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