Double-wedge type double-ball-clack valve

Abstract

The invention discloses a double-wedge type double-ball-clack valve. A sphere of the double-wedge type double-ball-clack valve is enabled to open and close through a method of exerting external force without rotation, and partial stress, friction and abrasion are avoided and reduced. The double-wedge type double-ball-clack valve comprises a valve body, a valve seat, a support of the valve body, the sphere and a valve rod, wherein the valve seat is arranged in a flow passage in the valve body, the sphere corresponds to the valve seat and is arranged in the valve body, and the valve rod is connected with the sphere. The valve rod penetrates through gland packing of the valve body. A threaded rod at the upper end of the valve body is matched with a hand wheel nut on the support of the valve body. An L-shaped guide groove is formed in the side face of the valve rod. The support of the valve body is provided with a guide pin in a fixed mode, wherein the end portion of the guide pin is inserted into the guide groove. The double-wedge type double-ball-clack valve is characterized in that the sphere is composed of a left ball clack and a right ball clack, an upper portion between the two ball clacks is open upper taper space, a lower portion between the two ball clacks is open lower taper space, an upper wedge sphere is arranged in the upper taper space, a lower wedge sphere is arranged in the lower taper space, the upper wedge sphere corresponds to the lower wedge sphere, the upper end of the upper wedge sphere is fixedly connected with the lower end of the valve body, the lower end of the lower wedge sphere is connected with the valve body, an extending pin is arranged at the upper end of the upper wedge sphere or the lower end of the valve rod, and two ends of the extending pin are respectively arranged in horizontal grooves which are reserved at two upper ends of the two ball clacks.

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.

Images