Double-seal ball valve

Abstract

The invention discloses a double-seal ball valve. The double-seal ball valve comprises a valve body, as well as an upper sealing seat, an upper valve rod and a lower valve rod which are sequentially connected with the valve body, wherein a ball body is arranged in a middle cavity of the valve body; valve rod holes are formed in the upper end and the lower end of the ball body separately, and the ball body is fixed into the valve body by virtue of the penetration of the upper valve rod and the lower valve rod into the valve rod holes; and rail disc seat surfaces are arranged between the upper valve rod and the upper-end spherical surface of the ball body as well as between the lower valve rod and the lower-end spherical surface of the ball body, a plurality of screw holes are formed in eachrail disc seat surface, and a rail disc is fastened onto each rail disc seat surface on the ball body through screws. According to the double-seal ball valve, a main valve seat and an auxiliary valveseat are arranged at the two ends of the ball body separately, the main valve seats are separated from the spherical surfaces and have no friction with the spherical surfaces in opening and closing processes, and the auxiliary valve seats generate friction with the spherical surfaces in the form of hard seal, so that impurities on the spherical surfaces are effectively scraped off, the effect ofhighly cleaning the spherical surfaces to protect main seal and auxiliary seal is acted, and the main seal can achieve the effects of realizing absolutely reliable seal and prolonging the service life; and the double-seal ball valve has the characteristics of being high in sealing performance, long in life, and resistant to ageing.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a double-sealed ball valve. Background technique [0002] In the existing fixed ball valve, a sphere is arranged in the middle cavity of the valve body, and the upper and lower valve stems are fixedly connected to the valve body. A sealing ring is provided at both ends of the sphere, which are closely attached to the spherical surface. Leakage, the seal is not reliable enough, and the valve seat and the spherical surface are rubbed and worn during the switch process, which shortens the service life. [0003] Therefore, how to provide a double-sealed ball valve with good sealing performance, long service life and anti-aging characteristics is an urgent problem to be solved by those skilled in the art. Contents of the invention [0004] In view of this, the present invention provides a double-sealed ball valve with good sealing performance, long service life and anti-aging ch...

AI Technical Summary

Problems solved by technology

[0002] The existing fixed ball valve is provided with a sphere in the middle cavity of the valve body, which is fixedly connected with the upper and lower valve stems. The valve body is provided with a sealing ring at both ends of the sphere, which is closely attached to the spherical surface. Leakage, the seal is not reliable enough, and the valve seat and the spherical surface are worn by friction and wear during the switching process, which shortens the service life

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