Two-way ball valve with cold-drawn integral valve body and preparation method of two-way ball valve

Abstract

The invention relates to a two-way ball valve of a cold-drawn integral valve body and a preparation method of the two-way ball valve. A valve body of the ball valve is an integral valve body formed by cold drawing, a left connecting pipe and a right connecting pipe are arranged on the left side and the right side of the integral valve body correspondingly, a vertically upward valve rod sleeve or a valve rod sleeve connector extends out of the top of the integral valve body, an independently machined valve rod sleeve body is connected to the valve rod sleeve connector, and the valve rod sleeve body and the valve rod sleeve connector are welded together to form the valve rod sleeve jointly, according to the preparation method, a liquid expansion cold-drawing process is adopted for cold-drawing a top pipe on a straight-through seamless steel pipe, a ball body of a valve and each side valve seat assembly are assembled in a workpiece from a pipe opening of a cold-drawn workpiece, an internal expansion clamp is adopted for positioning between each side valve seat assembly and the ball body, and pipe sections on the left and right sides of the workpiece are compressed into a left connecting pipe and a right connecting pipe of the whole valve body correspondingly by adopting a cold compression process. According to the two-way ball valve with cold-drawn integral valve body and the preparation method of the two-way ball valve, welding seams on the valve body are reduced or eliminated, the welding difficulty of the welding seams which are not eliminated is reduced, and the concentricity of valve seats on the two sides can be improved.

Description

technical field [0001] The invention relates to a two-way ball valve with a cold-drawn integral valve body and a preparation method thereof, which can be used as a large-caliber ball valve and ball valves with other calibers in heating systems and the like. Background technique [0002] The valve body of the large-diameter two-way ball valve used in the existing heating system and other occasions is a welded valve body. The connecting pipes on the left and right sides and the top valve stem sleeve are welded to the corresponding interfaces of the main valve body to form three welds, two of which are It is the vertical circular V-shaped weld between the two sides of the pipe and the main valve body, and the other is the horizontal intersecting line fillet weld between the valve stem sleeve and the main valve body. These welds are not only large in number and long in length, but also Welding is difficult and costly, and it is prone to defects such as uneven welds or weld leaka...

AI Technical Summary

Problems solved by technology

[0002] The valve body of the large-diameter two-way ball valve used in the existing heating system and other occasions is a welded valve body. The connecting pipes on the left and right sides and the top valve stem sleeve are welded to the corresponding interfaces of the main valve body to form three welds, two of which are It is the vertical circular V-shaped weld between the two sides of the pipe and the main valve body, and the other is the horizontal intersecting line fillet weld between the valve stem sleeve and the main valve body. These welds are not only large in number and long in length, but also Welding is difficult and costly, and it is prone to defects such as uneven welds or weld leakage. Repairs after weld problems are difficult and time-consuming

In addition, due to the difficult process of assembly and welding, it is difficult to ensure the concentricity of the sealing surfaces of the valve seats on both sides, resulting in unstable opening and closing torque of the ball valve.

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