Sealing structure for eccentric semi-ball valve

Abstract

The invention discloses a sealing structure for an eccentric semi-ball valve. The sealing structure comprises a valve body, a valve seat, a valve seat pressing ring and a valve element, wherein a step is arranged at the sealing surface of the valve body; the valve seat is located on the sealing surface of the valve body; the sealing surface of the valve seat is also provided with a step; a V-shaped sealing ring is arranged between the step of the valve seat and the step of the valve body; the valve element is arranged in the valve body; the bottom of the V-shaped sealing ring is in compression contact with the valve element when the valve is closed; the valve seat pressing ring is connected with the valve body; the valve seat pressing ring compresses the valve seat; an adjustable screw is arranged on the valve seat pressing ring; and the V-shaped sealing ring can compress or release the valve element by adjusting the adjustable screw. According to the sealing structure, the sealing ring at the sealing surface of the valve is arranged between the valve seat and the valve body instead of being arranged on the valve body, so that the difficulty of machining a dovetail groove in the valve body is avoided, and the sealing ring does not easily fall off; and the V-shaped sealing ring can be deformed under the press of a medium in a pipeline, so that a self-sealing property is provided, and sealing reliability is improved.

Description

technical field [0001] The invention relates to the technical field of eccentric hemispherical valves, in particular to a sealing structure of eccentric hemispherical valves. Background technique [0002] The eccentric hemispherical valve is also called the C-type ball valve, which makes the valve unblocked or blocked by rotating the hemisphere. Its switch is light, small in size, and can be made into a large diameter. It is eroded by the medium and is widely used in petroleum, chemical, urban water supply and drainage and other working conditions that require strict sealing. [0003] According to the different sealing surfaces, the eccentric hemispherical valve can be divided into two different forms: soft seal and hard seal. At present, in the soft seal eccentric hemispherical valve, the sealing surface is generally processed by dovetail groove on the valve body, and the dovetail groove is placed The form of sealing ring realizes sealing. The disadvantages of this sealing...

AI Technical Summary

Problems solved by technology

[0003] According to the different sealing surfaces, the eccentric hemispherical valve can be divided into two different forms: soft seal and hard seal. At present, in the soft seal eccentric hemispherical valve, the sealing surface is generally processed by dovetail groove on the valve body, and the dovetail groove is placed The form of sealing ring realizes sealing. The disadvantages of this sealing form are: it is difficult to process the dovetail groove directly on the valve body and the processing size is not easy to control. Often the sealing ring is put into the dovetail groove after processing. When the valve runs for a period of time The rear sealing ring is easy to fall off, and the sealing effect cannot be achieved, resulting in serious leakage of the valve, and the sealing reliability is not easy to guarantee

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