Built-in multi-valve-seat spherical all-welded ball valve and manufacturing method thereof

Abstract

The invention relates to a built-in multi-valve-seat spherical all-welded ball valve and a manufacturing method thereof. The built-in multi-valve-seat spherical all-welded ball valve comprises a left valve body, a right valve body, a valve rod, a ball and valve seats. The inner end face of the left valve body and the inner end face of the right valve body are in butt welding connection to form the valve body of the ball valve, the ball is arranged in the valve body, and the valve rod penetrates the top of the valve body to be connected with the ball. The valve seats are arranged between the valve body and the ball. The upstream part and the downstream part of the ball valve are each provided with two or three valve seats. According to the manufacturing method of the built-in multi-valve-seat spherical all-welded ball valve, the 3D numerical control laser welding technology is adopted in bearing pedestal supporting for surfacing forming. Only two weld joints exist, and the safety of the valve is improved. The upstream part and the downstream part are each provided with the multiple valve seats, each valve seat is relatively independent, and therefore the sealing reliability of the valve is greatly improved, and the service life of the valve is prolonged. The main weld joint of the valve body and the gland weld joint are in butt welding, and therefore stress concentration and welding defects generated by T-shaped weld joints are avoided.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a built-in multi-seat spherical fully welded ball valve and a manufacturing method thereof. Background technique [0002] as attached figure 1 As shown, the existing welded ball valve is mainly composed of a left body, a valve body, a valve stem, a valve seat, a positioning pin, a bearing seat, a sphere, etc., and its disadvantages are as follows: 1. The existing welded ball valve adopts a single seat structure, that is, There is only one valve seat in the upstream and downstream, and the valve seat of the fully welded ball valve can not be replaced under normal circumstances, unless the valve body is cut, so when the valve seat is damaged, the sealing of the valve fails, and it is very difficult to repair, and the sealing of the valve seat is reliable 2. Existing ellipsoid structure fully welded ball valve gland and valve body adopt T-shaped welds (such as Figure 4 As shown), ...

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Problems solved by technology

[0002] as attached figure 1 As shown, the existing welded ball valve is mainly composed of a left body, a valve body, a valve stem, a valve seat, a positioning pin, a bearing seat, a sphere, etc., and its disadvantages are as follows: 1. The existing welded ball valve adopts a single seat structure, that is, There is only one valve seat in the upstream and downstream, and the valve seat of the fully welded ball valve can not be replaced under normal circumstances, unless the valve body is cut, so when the valve seat is damaged, the sealing of the valve fails, and it is very difficult to repair, and the sealing of the valve seat is reliable 2. Existing ellipsoid structure fully welded ball valve gland and valve body adopt T-shaped welds (such as Figure 4 As shown), the weld seam stress is concentrated; 3. The existing fully welded ball valve body adopts a cylindrical structure or an ellipsoid structure, and its blanks are all formed by free forging, which has a large machining allowance and consumes materials and time; 4. The existing fully welded The ball valve has three or more welds, which reduces the reliability of the valve

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