Large-caliber high-pressure low-torque ball valve

Abstract

The invention discloses a large-caliber high-pressure low-torque ball valve which comprises a graphite ring, a valve seat, a ball body, a valve body, a lower bearing, a packing box, a receiving disc,a valve rod, a turbine head, a turbine, a turbine cover and a locking device. A fixing seat is fixed to an inner ring of the graphite ring, a spring is fixed to the left side of the valve seat, self-lubricating layers are fixed to the top and bottom of the ball body, sliding ways are formed in the periphery of the interior of the valve body, the top end of the lower bearing penetrates through thebottom of the valve body and is fixedly connected with a shaft seat at the bottom of the ball body, the packing box is installed at the top end of the valve body, the receiving disc penetrates throughthe packing box through a fixing nut, the bottom of the valve rod penetrates through the receiving disc and the packing box and extends into the valve body, and a connecting groove is formed in the left side of the turbine head. The large-caliber high-pressure low-torque ball valve is provided with a filter screen, impurities entering water in the valve body are filtered through the filter screen, and the situation that the precision of the whole surface of the ball body is affected due to the fact that the impurities in the water are left between the valve body and the ball body to scratch the ball body is avoided.

Description

technical field [0001] The invention relates to the technical field of ball valves, in particular to a large-diameter, high-pressure, low-torque ball valve. Background technique [0002] The ball valve is a new type of valve that came out in the 1950s. In just over 30 years, the ball valve has developed into a major valve category. It is used in aerospace, petrochemical, long-distance pipelines, light industry, food and construction Many aspects have been widely used. As early as the 1880s, the United States began to design ball valves, but the lack of appropriate sealing materials at that time limited the development of the method, making it fail to become a formal industrial product until the 1950s. In the 1990s, the emergence of elastic sealing materials such as polytetrafluoroethylene made the production and development of ball valves turn around. Different uses of the ball valve cause impurities to remain between the valve body and the ball during the use of the ball v...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the deficiencies of the prior art and provide a large-diameter high-pressure low-torque ball valve to solve the problem of friction between the ball and the ball caused by impurities left between the valve body and the ball in the background technology mentioned above. , thus affecting the accuracy of the sphere, causing the connection gap between the valve body and the sphere to be too large, making the sphere unable to play a sealing role

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