Check valve

Abstract

The invention relates to a check valve and belongs to the technical field of mechanical design and manufacturing. The check valve comprises a valve body and a valve seat. The valve seat is an annular body, and a valve sealing face is arranged between an inner hole and the upper end face of the valve seat. An annular step is arranged in the valve body, and the inner cylindrical face of the annular step and the outer cylindrical face of the annular valve seat are in clearance fit. A sealing ring is arranged on the matched face between the valve body and the valve seat. The integral structure of a valve body and a valve seat of a traditional check valve is changed to the split structure that the valve body and the valve seat are matched, and the valve seat is made to be an independent accessory in a regular shape; and as long as the step hole in the valve body and the valve seat of the annular structure are machined separately, a one-way control function of the check valve can be achieved through an assembling method. The check valve has the advantages of being simple in machining process, low in machining cost and high in work efficiency.

Description

technical field [0001] The invention relates to a check valve, which belongs to the technical field of mechanical design and manufacture. Background technique [0002] In the fluid control valve, in order to make the fluid flow in only one direction, people have designed a check valve, which uses the pressure of the fluid to overcome the spring force on the opposite direction of the valve core, thereby opening the valve core and the valve core. The valve sealing surface between the seats realizes the flow of fluid in one direction. The valve seat and the valve body on the traditional check valve have an integral structure, that is, the valve seat is formed by cutting the valve body. In order to enhance the sealing ability, corrosion resistance and wear resistance of the valve seat valve seat, a layer of nickel-based alloy is also spray-welded on the valve seat valve surface. Regular, so the final formed nickel-based alloy valve sealing surface also needs to be formed throu...

AI Technical Summary

Problems solved by technology

It can be seen from the structure and formation method of the valve sealing surface mentioned above that its processing technology is relatively complicated, especially because the valve seat and the valve body are an integral structure, the valve body needs to be clamped repeatedly during processing, and the valve body is Irregular shapes must be clamped by corresponding fixtures to make the clamping position consistent, which makes the processing process more cumbersome, the process cost is correspondingly increased, and the work efficiency is also significantly reduced.

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