Swing type internal thread check valve

Abstract

The invention discloses a swing type internal thread check valve which comprises a valve body, a valve cover, a valve cavity formed in the valve body, a valve clack installed in the valve cavity and a valve seat arranged in the valve cavity and matched with the valve clack in a sealing mode, an installation rail located in the valve cavity is arranged on the valve cover, and an ejection block is arranged in the installation rail in a sliding mode. A linkage piece forming linkage of the ejector block and the valve clack is arranged between the ejector block and the valve clack, a limiting block is arranged in the mounting rail in a sliding mode, a control assembly for controlling the limiting block to slide is arranged on the valve deck, and elastic barbs connected to the limiting block in a hung mode in the sliding process are arranged on the two sides of the ejector block. The limiting block is provided with a driving component used for driving the elastic barb to be separated from the limiting block in the moving process. The valve clack has the following advantages and effects that the opening degree of the valve clack and whether positioning is needed or not after the valve clack is opened can be adjusted at the same time only through the screw, and operation is quite convenient.

Description

technical field [0001] The invention relates to the technical field of valve manufacturing, in particular to a swing-type internal thread check valve. Background technique [0002] Valves are often used as fluid switches in pipeline engineering, and some pipeline engineering requires that the fluid flow in a fixed direction. The check valve is a kind of valve that blocks the backflow of the medium by its own weight and medium pressure. It belongs to the automatic valve type. When the fluid is cut off, the check valve plate will move in the opposite direction under the action of gravity, and it will be in close contact with the valve seat to prevent the fluid from flowing backwards. [0003] Since the check valve is qualitatively determined to be used for quick closing in most practical applications, and the disc of the swing check valve and the rocker arm are all rotationally connected, so when the swing check valve is opened During the process, because the flow channels o...

AI Technical Summary

Problems solved by technology

[0003] Since the check valve is qualitatively determined to be used for quick closing in most practical applications, and the disc of the swing check valve and the rocker arm are all rotationally connected, so when the swing check valve is opened During the process, because the flow path of the medium is relatively tortuous, water hammer usually occurs during the flow of the medium. When the water hammer impacts the valve disc, the valve disc and the rocker arm will cause movement. In the check valve During long-term work, if the water hammer continues to impact the valve disc, it is easy to cause the connection between the rocker arm and the valve disc to loosen or even detach, seriously affecting the normal use of the check valve

Since the valve disc of the check valve itself will also become a resistance, when the medium is discharged from the low-pressure area to the high-pressure area, if the impact force of the medium is lower than the back pressure of the valve disc, it is easy to cause the valve disc to open and close intermittently, thus Increase the wear of the disc and seat, reduce the sealing performance and service life of the disc and seat

[0004] And because the existing check valves do not have the function of adjusting the opening, when the flow of the medium needs to be adjusted, the regulating valve can only be installed on the pipeline, which not only increases the cost, but also makes the operation more cumbersome

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