Pipeline ball valve and manufacturing method thereof

Abstract

The invention discloses a pipeline ball valve and a manufacturing method thereof. At present, the shapes of pipeline ball valve bodies are most of cylindrical shapes or spindle body shapes, and most main valve bodies have two welding lines, so that the defects of more leakage hidden dangers and shorter service life exist. The pipeline ball valve is characterized in that the valve body is of a ball shape and formed by welding two hemispherical shells to form a circle of vertical welding line, and the center of the valve ball is coaxial with the center of the valve body; the upper end part and the lower end part of the valve body are respectively provided with a welding junction, the welding junction positioned at the upper part of the valve body is welded with a shaft sleeve of a valve rod to form a circle of radial welding line, and the welding junction positioned on the lower part of the valve rod is welded with a shaft sleeve of a trunnion to form a circle of radial welding line; and a floating valve seat used for sealing the valve ball and the valve body is arranged between the valve ball and the valve body. The ball valve of the invention is of an all-welded integral type and has the advantages of compact structure and high strength; and the floating valve seat is mainly subjected to rigid seal and supplementarily subjected to flexible seal, and dual seals of an upstream and a downstream are adopted, so that the sealing performance is reliable and durable.

Description

technical field [0001] The invention relates to a pipeline ball valve and a manufacturing method thereof. Background technique [0002] Ball valves for pipelines are used in gas transmission and liquid infusion in natural gas trunk roads, gas terminals, offshore platforms, airports, etc. At present, the shape of the valve body (also called the shell) is mostly cylindrical or spindle, and the welding seam of the main body of the valve body is mostly There are two, excluding the welding seam with the valve stem, so there are many hidden dangers of leakage and short service life; in order to ensure the strength and rigidity of the valve body, extra additional thickness or ribs are usually added to the valve body. In addition, the sealing performance of the valve seat used for sealing between the valve body and the valve ball is poor, and cannot meet the high sealing performance requirements in some application occasions. With the rapid development of international and domestic...

AI Technical Summary

Problems solved by technology

[0002] Ball valves for pipelines are used in gas transmission and liquid infusion in natural gas trunk roads, gas terminals, offshore platforms, airports, etc. At present, the shape of the valve body (also called the shell) is mostly cylindrical or spindle, and the welding seam of the main body of the valve body is mostly There are two lines, excluding the welding seam with the valve stem, so there are many hidden dangers of leakage and short service life; in order to ensure the strength and rigidity of the valve body, extra additional thickness or ribs are usually added to the valve body

In addition, the sealing performance of the valve seat used for sealing between the valve body and the valve ball is poor, which cannot meet the high sealing performance requirements in some applications

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