a check valve

Abstract

The invention relates to a check valve. The check valve comprises a valve body, a valve cover, a valve part, a pressing spring, a control valve rod and a return spring, wherein an inlet runner, an outlet runner and a separation plate are arranged in the valve body; the separation plate is provided with a guide hole and a flowing-through hole; the valve cover is fixedly mounted at the upper end ofthe valve body; the valve part is L-shaped, and is provided with a spiral groove inside; the valve part is pressed on the separation plate by the pressing spring; the control valve is slidingly matched in the guide hole, and is provided with a cylindrical projection matched with the spiral groove; and the return spring enables the control valve rod to maintain in a downward moving tendency. The check valve is free of impact between the valve part and the separation plate in the opening process, can prolong the service life, and achieves a high closing speed.

Description

technical field [0001] The invention belongs to the technical field of pipeline valves, in particular to a check valve. Background technique [0002] Check valve refers to the valve that relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is a kind of automatic valve, its main function is to prevent the reverse flow of the medium, the reverse rotation of the pump and the drive motor, and the discharge of the container medium. According to the structure, the check valve can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valve can be divided into two types: vertical and horizontal. [0003] The check valve used in oil exploration pipelines is mainly a horizontal check valve, which mainly has a valve body, a valve seat, a valve disc and a valve cover. T...

AI Technical Summary

Problems solved by technology

[0004] The traditional horizontal check valve has a large impact force every time the disc is closed, which leads to frequent impacts on the sealing surface (usually the conical surface) of the lower part of the disc, resulting in damage and leakage of the valve

For example, in a check valve disclosed in Chinese utility model patent CN204284543U, although a valve stem is provided to limit the position of the valve disc, a large impact is still generated under the action of the spring when the valve disc is closed, and the sealing surface of the valve disc Appropriate protection measures are not taken, and the sealing surface is easily damaged. The service life of this check valve is generally not long, and the site replacement and maintenance are frequent

[0005] In the prior art, although there is a check valve to prevent impact, for example, the patent No. is CN106870779B, the invention patent named as anti-shock lift check valve, the patent No. is CN105003694B, the patent named as anti-shock check valve, However, these existing technologies all set different structures to make the valve disc move slowly downward when it is closed. Although the technical effect of preventing impact can be achieved, because the valve disc closes slowly, it also causes part of the medium to flow back.

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