One-way valve

Abstract

The invention relates a kind of one-way valve which is used in the air pressure or hydraulic pressure system and prevents the medium back flow. It includes a valve body and a spool layout in the internal of valve body and the valve body said above is a partial structure which is composed by the upper course valve and the lower reaches valve interaction spiral connection. The upper course valve body has a axial seal face adapting to the spool and on the seal face sets up a seal ring. The spool and the valve body previous told adapt with endwise slip and the medium entryway of the site of endwise slip is installed on the spool or the valve body; the valve body is guided when the spool makes the resetting movement it can align the seal face and the seal is well also the medium doesn't back flow. The upper valve body described previous is a hollow inner angle bolt structure putted in the internal of the lower reaches valve body; at the root of the inner angle bolt and the screw chaser section sets up a seal ring so the medium didn't leak out either in.

Description

technical field [0001] The invention relates to a one-way valve, which is mainly used in air pressure or hydraulic control systems to prevent medium backflow. Background technique [0002] Pneumatic or hydraulic control systems have high requirements on the reliability, stability, sensitivity and sealing performance of the check valve, otherwise it will seriously affect the control accuracy or adjustment quality, and even cause safety accidents. [0003] The existing one-way valve is shown in Figure 1. It is a split structure consisting of an upstream valve body 10 and a downstream valve body 20. The upstream valve body 10 has an axial sealing surface that cooperates with the valve core 30. The valve One end face of the core 30 cooperates with the axial sealing surface, and the sealing surface is provided with an "O"-shaped sealing ring 40. The tail of the valve core 30 is placed in the hole of the downstream valve body 20, and there is a gap with the hole wall. The gap acts...

AI Technical Summary

Problems solved by technology

However, since the valve core 30 is a free body in the valve body, it cannot be guided during the reset movement, and its relative position with the sealing surface is uncertain, so it is difficult to ensure that it is aligned with the sealing surface, resulting in poor sealing and medium backflow

[0004] In addition, the upstream valve body 10 and the downstream valve body 20 are screwed on the outer surface of the valve body, and there is no sealing element, forming a leakage point, and the medium is easy to leak

[0005] Furthermore, the valve seat used for cooperating with the valve core 30 is located at the root of the inner hole of the upstream valve body 10, the processing of the valve seat and the assembly of the valve are difficult, and the accuracy is difficult to guarantee.

[0006] In addition, the shape design of the check valve is unreasonable. First, the diameter of the external thread section used to connect with the pipeline is smaller than the diameter of the pipeline. Two transition joints must be added during installation, which adds two leak points, reducing system reliability

The second is that the size of the hexagonal head section is very large. After the check valve is installed, an obvious bulge will be formed in the pipeline, which is not only unsightly, but also vulnerable to accidental damage.

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