Multifunctional plug valve

Abstract

The invention discloses a multifunctional plug valve which comprises a drive mechanism, a valve rod, a valve cover, a press plate, a valve core and a valve body. A rotary shaft of the drive mechanism drives the valve core to rotate through the valve rod. Two work faces and two sealing faces which are distributed in cross mode are evenly distributed on the periphery of the valve core, the valve core and a hard sealing ring face welded on the edge of an outlet of the inside of the plug valve form a rotary sealing pair. One work face of the valve core is provided with a through hole. An inner circle and an excircle of the other work face of the valve core are respectively provided with a group of mutually staggered straight grooves identical in size, and the inner straight grooves are communicated with the outer straight grooves through internal circular arc cavities. The multifunctional plug valve has functions of the plug valve. Communication and cutting off of the work faces and the outlet are achieved through rotary motion in the valve closing and opening process. The functions of the plug valve can be diversified through a multiple-work-face structure. A first work face can achieve the functions of the common plug valve. A second work face further has the effects of reducing pressure and preventing cavitation. The multifunctional plug valve can meet the demands of the field of petroleum, chemical engineering, water conservancy and the like.

Description

technical field [0001] The invention relates to a plug valve, in particular to a multifunctional plug valve. Background technique [0002] Among various types of valves, plug valves are the most widely used one. Plug valve refers to a valve in which the closing member rotates around the axis of the cavity of the valve body to realize the opening and closing process. On the pipeline, it is mainly used to cut off, distribute and change the flow direction of the medium. The plug valve has the advantages of simple structure, quick opening and closing, convenient operation, and small fluid resistance. [0003] It is widely used in hydraulic engineering in the process of oil and natural gas exploitation and on the pipelines of oil, natural gas and refined oil. [0004] At the same time, the plug valve also has some shortcomings such as single function, which can only play the role of circulation and cut-off; and when the plug valve has a small opening, due to the small flow sur...

AI Technical Summary

Problems solved by technology

[0004] At the same time, the plug valve also has some shortcomings such as single function, which can only play the role of circulation and cut-off; and when the plug valve has a small opening, due to the small flow surface, the flow velocity of the medium is relatively high, and jet flow is formed locally, which will cause Cavitation phenomenon, causing damage to the valve core, thereby reducing the life of the valve

In the environment that requires frequent opening and closing, and the working conditions are relatively harsh, such as high temperature and high pressure working conditions, the damage of cavitation is more serious, which poses a great challenge to the safety of the valve.

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