Gate valve and its manufacturing process

Abstract

The invention discloses a gate valve and a manufacturing process thereof. The gate valve comprises a valve body with a T-joint structure, wherein an opening in the upper end of the valve body is connected with a valve cover; a valve stem penetrates into the valve body; the upper end of the valve stem is vertically connected with a handwheel, and the lower end of the valve stem is connected with a valve plate used for controlling opening and closing; a left connecting pipe and a right connecting pipe are respectively inserted into opposite openings on the left and right of the lower end of the valve body; the inner ends, adjacent to the valve plate, of the left connecting pipe and the right connecting pipe are respectively provided with a valve base; the peripheral surfaces of the left connecting pipe and the right connecting pipe are respectively welded and fixed together with the left and right side surfaces of the lower end of the valve body. Components, such as the valve body, the left connecting pipe and the right connecting pipe, in the gate valve are forged and molded, then are respectively processed and finally assembled without special fixtures, so that the labor strength is reduced, and the machining time is shortened.

Description

technical field [0001] The invention relates to the field of valves, in particular to a gate valve and a manufacturing process thereof. Background technique [0002] The high-pressure gate valve has reasonable structure, reliable sealing and easy operation. Its sealing surface is spray-welded with hard alloy, which has the advantages of anti-corrosion, wear-resistant and erosion-resistant, and can be used for throttling. Water, oil, mud, and natural gas pipelines at ≤120°C are used as opening and closing and regulating devices to control the flow of media. It can be seen that gate valves are widely used, mainly suitable for underground mining of oil, natural gas, nitrate, and brine, and transportation of oil and gas pipelines. However, conventional high-pressure gate valves are produced by integral casting or forging of the valve body. Therefore, special clamping fixtures are required during processing, which is not only time-consuming and laborious, but also makes processi...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve many quality problems in the integral casting of the existing gate valve body, such as air holes, sand holes and other defects, and also need to use special clamping fixtures, which is not only time-consuming and laborious, but also makes processing difficult. growing problem

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