Novel overflow plug valve used in high-pressure state

Abstract

The invention discloses a novel overflow plug valve used in a high-pressure state, and relates to the technical field of plug valves, the novel overflow plug valve comprises a valve body, a conical inner hole is formed in the valve body, a plug tile is further arranged in the inner hole, the outer surface of the plug tile is arranged to be a conical surface matched with the inner hole, and the outer surface of the plug tile is arranged to be a conical surface matched with the inner hole. A through opening is formed in the side face of the cock tile, an overflow cock is arranged in the cock tile, a hand wheel capable of driving the overflow cock to rotate is installed at the top of the valve body, and the bottom of the valve body is in threaded connection with an adjusting nut. Opening and closing of the sealing mechanism can be controlled by screwing the sealing plug, after the sealing mechanism is opened, high-pressure fluid located on the upstream of the overflow cock can flow into the downstream of the overflow cock through the sealing mechanism, pressure balance of the upstream and the downstream of the overflow cock is guaranteed, and therefore the pressure borne by the overflow cock in the circumferential direction is uniform, and the service life of the overflow cock is prolonged. Therefore, the effect of low-pressure-difference opening of the overflow cock is achieved.

Description

technical field [0001] The invention belongs to the technical field of plug valves, and in particular relates to a novel overflow plug valve used in a high pressure state. Background technique [0002] The plug valve is a closed or plunger-shaped rotary valve, which can be opened or closed by rotating 90 degrees to connect or separate the channel opening on the valve plug and the channel opening on the valve body. [0003] Its valve plug can be cylindrical or conical in shape. In cylindrical plugs, the passages are generally rectangular; in conical plugs, the passages are trapezoidal. These shapes allow for a lightweight construction of the plug valve. It is most suitable for shut-off and connection medium and for diverting, but can also be used for throttling depending on the properties of the application and the erosion resistance of the sealing surface. [0004] Due to its structural characteristics, the existing plug valve will form a large pressure difference between...

AI Technical Summary

Problems solved by technology

[0004] Due to its structural characteristics, the existing plug valves have a large pressure difference between the upstream and downstream of the plug when the plug valve is in use, and this pressure difference will force the plug to be tightly pressed against the tile of the plug, so that the plug is in contact with the plug. There is a large friction between the cock tiles, which is not conducive to the opening and closing of the cock valve, and also seriously affects the service life of the cock and cock tiles.

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