Slurry ball valve

Abstract

The invention discloses a slurry ball valve and relates to a valve. The slurry ball valve comprises a valve body, a ball and two valve decks arranged on the two opposite sides of the ball. The hole diameters of the ends, close to the ball, of inner holes of the valve decks are larger than the hole diameters of the ends away from the ball, of the inner holes, a valve seat supporting ring is arranged between the valve deck located on the upstream and the ball, a valve seat is arranged at the end, close to the ball, of the valve seat supporting ring, the outer side wall of the valve seat supporting ring is in a stair shape, the outer diameter of the end, close to the ball, of the valve seat supporting ring is larger than the outer diameter of the end, away from the ball, of the valve seat supporting ring, O-shaped sealing rings are arranged on the surfaces of the two side walls, different in outer diameter, of the valve seat bearing ring respectively in the circumferential direction to form two radial sealing faces, a pre-tightening spring is arranged between the valve seat supporting ring and the corresponding valve deck, and the pre-tightening spring is arranged between the upper O-shaped sealing ring and the lower O-shaped sealing ring in the horizontal direction. The pre-tightening spring cannot be stuck by medium crystal substances, washing to the sealing faces by media can be overcome, the abrasion of the ball can be reduced, the service life of the valve can be prolonged, and high practicability is achieved.

Description

technical field [0001] The invention relates to a valve, in particular to a slurry ball valve. Background technique [0002] Slurry ball valves are mainly used in the coal mine industry and thermal power stations. The valves are installed on pipelines conveying high-velocity solid particles (such as coal ash, etc.) as opening and closing parts, and the valves are frequently opened and closed. The pre-tightening spring of the existing slurry ball valve generally adopts a coil spring. Since the conveying medium is solid particles, the particles will gather in the spring hole during the use of the valve, causing the spring to be stuck and the valve seal to fail immediately. [0003] Moreover, due to the high flow rate and high hardness of the conveying medium, the erosion of the sealing surface by the medium is very serious. The sealing surface of ordinary hard-sealed ball valves will be destroyed by the medium soon, and the service life of the valve is extremely short. [00...

AI Technical Summary

Problems solved by technology

The pre-tightening spring of the existing slurry ball valve generally adopts a helical spring. Because the conveying medium is solid particles, the particles will gather in the spring hole during the use of the valve, causing the spring to be stuck and the valve seal to fail immediately.

[0003] Moreover, due to the high flow rate and high hardness of the conveying medium, the erosion of the sealing surface by the medium is very serious. The sealing surface of ordinary hard-sealed ball valves will be destroyed by the medium soon, and the service life of the valve is extremely short.

[0004] In addition, because the opening and closing frequency of the slurry ball valve is relatively fast, the opening and closing is usually completed in a few minutes. Frequent opening and closing will increase the wear of the ball and reduce the service life of the valve.

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