Horizontal shaft eccentric semi-ball valve

Abstract

The invention discloses a horizontal shaft eccentric semi-ball valve. A valve element is installed through a horizontal shaft structure, the axis of a valve rod of the horizontal shaft eccentric semi-ball valve is perpendicular to the flowing direction of media in a valve body and is horizontally arranged, the lower end of a flow channel is not occupied, the lower end of the flow channel can be designed to be smoother than a vertical eccentric semi-ball valve, and flowing resistance is reduced. A cylindrical boss concentric with the valve element is arranged on the valve element, a sealing ring is arranged on the boss in a sleeving manner at an interval, the sealing ring is provided with a spherical-crown-shaped sealing face, an air bag ring is arranged in a clamping gap formed by the bossand the sealing ring, and the sealing ring and the valve element are fixed through a fixing assembly. The center of a valve element sealing spherical crown and the center of a valve seat can be adjusted to be concentric in the assembling process, machining errors are overcome, and effective sealing is guaranteed.

Description

technical field [0001] The invention relates to the field of valves, in particular to a horizontal-shaft eccentric hemispherical valve. Background technique [0002] Ball valves are mainly used in pipelines to cut, distribute and change the flow direction of media, and are widely used in petroleum, chemical industry, metallurgy, textile, food, atomic energy, aviation and other fields. Eccentric ball valve is a relatively new type of ball valve. It has some advantages unique to its own structure. It can be tightly closed only by rotating 90° and a small rotational torque. The switch has no friction and the seal is not easy to wear. The opening and closing torque is small, which can reduce the specification of the matched actuator. [0003] At present, the eccentric hemispherical valve on the market is basically designed and produced according to the standard of "GB / T26146-2010 Eccentric Hemispherical Valve", and the product is basically a vertical shaft structure. Vertical ...

AI Technical Summary

Problems solved by technology

[0004] 1. High vertical space requirements;

[0005] 2. The valve core needs to occupy the lower end of the flow channel, so that the arc of the flow channel in the inner cavity of the valve is large, which increases the flow resistance of the medium;

[0006] 3. After long-term use, the wear of the main seal pair on the valve core cannot achieve complete online maintenance

However, the eccentric ball valve installs the valve seat floatingly on the valve body. In order to ensure that the valve seat can float smoothly in the annular groove, the structure itself is a clearance fit. In addition, the end face of the valve seat and the inner wall of the annular groove are repeatedly worn, which will cause If the seal is not tight, the medium flows into the tiny gap between the outer circumference of the valve seat and the bottom surface of the annular groove. If the medium accumulates and crystallizes, the tiny gap will be blocked, and the valve seat will lose the function of fine-tuning, or only the tiny gap below The gap is blocked, causing the seat eccentric seal to fail

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