Gate valve structure and production method therefor

A manufacturing method and gate valve technology, applied in the valve shell structure, manufacturing tool, sliding valve and other directions, can solve the problems of raw material waste and cost increase, and achieve the effect of shortening the construction period, reducing the cost of repairing, and reducing consumption

Inactive Publication Date: 2019-05-21
株式会社蒂克斯IKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Raw materials are wasted due to the corresponding increase in raw materials and fuel consumed for heating, resulting in increased costs (Patent Document 1, Non-Patent Document 1)

Method used

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  • Gate valve structure and production method therefor
  • Gate valve structure and production method therefor
  • Gate valve structure and production method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0042] When the valve body is produced by forging, if it has an axisymmetric shape, it can be easily produced by ring forging or die forging. However, both ring forging and die forging are difficult to form a product with a large length / diameter ratio or a product with a thin wall thickness. In order to facilitate forging, such as Figure 4A As shown, the valve body is divided at the connecting pipe portion so that the length / diameter ratio becomes small. In addition, by dividing the bulging portion that can die-forge the central portion of the valve body, a material close to the final shape can be used, thereby reducing material costs.

[0043] Use iron and steel materials with a carbon content of 0.1-0.4%, hot forge the parts 40 and 41 of the valve body at 1000-1500°C, and perform heat treatment (quenching, annealing) if necessary. in such as Figure 4B After the hemispherical valve body parts 40, 41 are welded in this way, the opening 42 ( Figure 4C ). For example, a ...

Embodiment 2

[0048] In the present invention, the welded portion of the connecting pipe may also be formed as Figure 5 structure shown. That is, on the outside of the connecting pipe 55, an annular protruding portion 57 is integrally formed with the connecting pipe in the form of a part of the spherical portion of the valve body, and the outer periphery of the protruding portion 57 is made with it. The boundaries between matching openings serve as welds 53 . If the protruding portion 57 protrudes more than 2 cm outside the connecting tube, the radiation 61 from the radiation source 60 can be easily irradiated to the welded part 53 in the radiation inspection, and the photosensitive film 62 for radiation detection can be easily placed on the surface of the joint. Since it is fixed inside the valve body, radiological inspection can be easily performed.

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Abstract

With the simple cylindrical body shape of gate valves that are currently on the market, the welded portions have three-dimensionally curved shapes and welding is difficult for general purpose weldingmachines. Moreover, in manufacture by casting, there are many defects in the material such as cavities and sand trapping, and man-hours and cost are necessary to repair same. In the gate valve according to the present invention, a body has openings to accommodate two connecting pipes and a gate. The two connecting pipes respectively pass through the two openings and are disposed so as to face thegate from two sides. The two connecting pipes are each joined to the body by welding at an opening and the shape of said welded sections is a circular ring. Moreover, when producing the body in the present invention, the body portion is manufactured by forging instead of casting and after machining, is unified by welding.

Description

[0001] References [0002] This application claims priority from Japanese Patent Application No. 2016-199813 filed on October 11, 2016, the contents of which are incorporated herein by reference. technical field [0003] The invention relates to a structure and a manufacturing method of a gate valve suitable for a pipeline for conveying liquid or gas, geothermal steam, and a valve for controlling the flow of fluid in mechanical equipment. Background technique [0004] Figure 1A , Figure 1B The shape and structure of a conventional gate valve are shown. In the case of low-pressure applications, the valve body is formed into a flat cylinder or box shape as the smallest shape that wraps around the gate. In the case of a high-pressure application, the connecting pipe portion 17 and the valve body 14 are generally cylindrical in shape in order to reduce the stress generated on the valve material. In order to arrange the shutter 12 perpendicular to the cylinder axis of the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K27/00F16K27/04F16K27/10
CPCF16K3/02F16K27/044F16K27/105B22C9/02B22C9/08B22D27/13F16K27/04F16K27/06F16K27/10
Inventor 新保进
Owner 株式会社蒂克斯IKS
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