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Manufacturing method of ball valve body

A manufacturing method and valve body technology, applied in valve details, valve device, valve shell structure and other directions, can solve the problems of affecting the pressure resistance of the valve body, complex manufacturing process, high material cost, saving material cost and low processing cost. , the effect of low production cost

Inactive Publication Date: 2010-06-16
张晓丰
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of valve body has complex manufacturing process, many technical difficulties, and high manufacturing cost. Because of its many welds, it also affects the pressure resistance of the valve body; high

Method used

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  • Manufacturing method of ball valve body
  • Manufacturing method of ball valve body
  • Manufacturing method of ball valve body

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0020] Such as figure 2 As shown, a valve body with a nominal diameter of DN300 is manufactured, and a 500T hydraulic press is used, such as image 3 As shown, the seamless steel pipe of Φ530-550 mm is first cut into a section steel pipe 1 with a length of about 1000 mm, and then the section steel pipe 1 is locally heated, and the heating part is heated from one end to the middle to 800-1000 °C; Then place the heated part of the section material steel pipe 1 downwardly in the lower die 2 for press forging. The die cavity of the lower die 2 is bucket-shaped, and its bucket portion 2a is a bowl-shaped cavity. The bottom of the pipe is penetrated by the straight hole 2b, and through the upsetting of the hydraulic press, the lower end of the segmented steel pipe 1 is formed into a small-diameter constricted circular pipe 3a by press forging, and the constricted...

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Abstract

The invention discloses a manufacturing method of ball valve bodies, comprising the following steps: (1) steel tube blanking, heating a steel tube which is blanked with segment materials; (2) placing the heated steel tube into a lower die for die pressing and forging to lead the lower end of the steel tube to be a necking circular tube; smoothly transiting the circumscribed cylinder of the unformed part of the necking circular tube and the steel tube through the ball surface, and discharging the semiformed material; (3) placing the semiformed material in the lower die after being turned around, the unformed part of the semiformed material is downward, the lower part of the semiformed material is formed by die pressing and forging to obtain the material with two symmetrical semi-part shapes; and (4) arranging a radial hole in the middle part of the material, and butting a tubular column on the radial hole and welding. The manufacturing method has simple process, lower processing cost, less seams of the integral valve body, high strength, strong pressure resistance, light weight, saved material and obvious economic benefit, and is especially suitable for manufacturing high-pressure ball valve body with all-welded pipelines.

Description

technical field [0001] The invention relates to a valve processing technology, in particular to a method for manufacturing a ball valve body. Background technique [0002] At present, the manufacturing methods of high pressure ball valve body mainly include casting and welding after forging. In order to ensure the strength and compressive capacity of the valve body, the international standard stipulates that the fully welded valve body cannot be welded with castings, but can only be welded with forgings. However, the current forged steel valve body is welded by the main body and the double auxiliary body, and the main body and the double auxiliary body need to be forged separately, such as figure 1 As shown, the forged main body 20 is a large-diameter pipe, and two secondary bodies are respectively welded on both sides of the main body. The two secondary bodies are formed by welding a small-diameter straight pipe 22 and a trumpet-shaped pipe 21. 22 is connected with the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K27/06
Inventor 张轩
Owner 张晓丰
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