Double seal mud valve with flushing function

Abstract

The invention discloses a double seal mud valve with a flushing function. The double seal mud valve is characterized in that an oblique sealing surface is arranged in a flow channel of a valve body, and a cylindrical sealing surface is arranged between the bottom surface of an inner cavity of the valve body and the oblique sealing surface; the lower end of a valve rod is fixedly provided with an upper valve clack and a lower valve clack, and a water injection hole is formed in the center of the valve rod; a plurality of flushing holes are formed in the lower end of the valve rod in the horizontal direction, and the upper end of the water injection hole is communicated with a high-pressure water source; the lower end of the water injection hole is communicated with the flushing holes, and the flushing holes are distributed between the upper valve clack and the lower valve clack; the upper valve clack is of an arc-shaped structure, and the diameter of a biggest part of an excircle of the arc is equal to the diameter of the cylindrical sealing surface in the flow channel; the lower end of the lower valve clack is provided with an arc-shaped sealing surface, and the arc-shaped sealing surface and the oblique sealing surface in the flow channel form a tangent seal; a vertical distance between the biggest part of the excircle of the upper valve clack and the arc-shaped sealing surface at the lower end of the lower valve clack is 0.6 to 0.8 times larger than the height of the cylindrical sealing surface in the flow channel. The double seal mud valve provided by the invention is ingenious in structure; when the valve is closed, multiple seals are realized, the sealing performance is good, and the service life is long.

Description

technical field [0001] The invention relates to a mud discharge valve, in particular to a double-seal mud discharge valve with flushing, which is mainly used in working conditions such as mud containing particles in the medium. Background technique [0002] In the prior art, the mud discharge valve includes a valve body, a valve cover, a valve stem and a valve disc. A fluid channel is arranged in the inner cavity of the valve body, a valve body sealing surface is arranged in the channel, and a valve disc sealing surface is provided at the lower end of the valve disc. Set in the inner cavity of the valve body, the valve disc can be lowered or lifted by the valve stem, so that the sealing surface of the valve disc can be contacted or separated from the sealing surface of the valve body, thereby closing or opening the medium channel. The disadvantage is that because the medium is mud with particles, the mud will remain between the sealing surface of the valve disc and the seal...

AI Technical Summary

Problems solved by technology

The disadvantage is that because the medium is mud with particles, the mud will remain between the sealing surface of the valve disc and the sealing surface of the valve body during the opening or closing process of the valve disc, so that the sealing surface of the valve disc cannot be pressed against the sealing surface of the valve body , so that the valve cannot be sealed

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