Double wedge double ball disc valve

Abstract

The invention discloses a double-wedge type double-ball disc valve, which is a valve that makes the ball open and close without applying external force through rotation transmission, and avoids and reduces local force, friction and wear. It has a valve body, a The valve seat of the flow channel in the body, the bracket of the valve body, the ball corresponding to the valve seat in the valve body, the valve stem connected with the ball, the valve stem passes through the sealing packing of the valve body, the screw on the upper end of the valve stem and the valve body bracket The handwheel nut is matched, the side of the valve stem has an L-shaped guide groove, and the bracket is fixed with a guide pin whose end is inserted into the guide groove; it is characterized in that: the ball is two left and right balls, and the upper part between the two balls The upper and lower parts are open upper and lower conical spaces, and the upper and lower conical spaces correspond to an upper wedge sphere and a lower wedge sphere. The upper end of the upper wedge sphere is fixedly connected with the lower end of the stem, and the lower wedge sphere The lower end is connected with the valve body, and the upper end of the upper wedge sphere or the lower end of the valve stem also has a protruding pin, and the two ends of the pin are respectively located in the transverse grooves left on the upper ends of the two ball discs.

Description

technical field [0001] The invention relates to a new type of ball valve, especially a double-disc ball valve with a device for separating or pressing the sealing surfaces on both sides of the ball plug from the valve seat. A ball valve that actuates a ball plug to close or open. Background technique [0002] At present, the ball valves (floating type, fixed type) used at home and abroad, when the ball rotates to implement the switch, the ball and the seat surface will produce sliding friction, which will cause the sealing surface to wear and scratch, which is also the main reason for the leakage and jamming of the valve seat sealing surface. . When the ball rotates under the heavy load of the pipeline medium, the sassafras and large load torque are the key technical problems to be solved urgently for the ball valve. In order to solve such problems, the Chinese utility model patent specification disclosed a "two-way metal-sealed ball valve" (patent No. 99225554.6) on Janua...

AI Technical Summary

Problems solved by technology

However, when the wedge spherical body squeezes and closes the ball disc to seal the valve seat, the pressure is still concentrated on the ball disc and the lower part of the valve seat. During the opening and closing process, the lower part of the ball disc is still larger than other parts, and local damage will still be caused, resulting in leakage or scrapping.

The turning process of the opening and closing of the two ball petals is driven by the matching surface of the trapezoidal wedge spherical body (also known as the wedge ball) to drive the loose ball petal to rotate, which also causes local stress on the mating surface of the wedge spherical body and the ball petal. If the length is too long, it will also cause local wear and tear, and the mating surfaces will not match, resulting in lax sealing or damage.

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