Double wedge double ball valve
There is no limit to creativity, great invention of instrument. Today we introduce a national invention patent - double wedge double ball valve. The patent by the Dalian ocean valve research and Development Co., Ltd., and in July 11, 2017 to obtain a notice of authorization.

Content description
The invention relates to a new ball, especially with a double valve ball valve plug and valve seat sealing surface on both sides separated or pressed together the device, formed between the two valve ball plug with wedge guides, ball valve ball plug drive closed or open.

Invention background
The ball used both at home and abroad (floating, fixed), ball rotary switch is implemented when the ball and seat surface sliding friction caused by the sealing surface wear and bruised, is also the main reason causing the leakage of the valve seat sealing surface stuck. When the ball rotates under the heavy load of the pipeline medium, there is a lot of damage to Guan Jian when it rotates the ball. In order to solve this problem, a new practical patent specification in January 12, 2000 China discloses a two-way metal sealing ball "(Patent No. 99225554.6), the valve in the valve body, valve seat, valve passage in the valve body and the valve seat bracket, corresponding to the ball, and the ball rod connected with the valve stem through the valve, hand wheel nut. The upper end of the valve rod and valve screw bracket matched with the guide groove, the side stem with L shape of the bracket is fixed with the end of the guide pin is inserted in the slot; about two ball ball valve, ball valve between the two to open space cone, cone space corresponding to a wedge ball form sliding connection the ball body is connected with the stem wedge. Such a ball valve, can avoid overloading the media under the action of rotating ball when sassafras and hurt large load torque. But the ball ball valve closed extrusion wedge shape sealing valve seat, the pressure is still concentrated in the lower part of the valve seat and ball valve, in the opening and closing process, the ball valve or lower than other parts, or to cause local damage, caused by leakage or scrap. Two ball valve opening and closing of the turning process is by wedge sphere trapezoid (also known as wedge sphere) with surface driven loose ball valve rotation, also causing the wedge body and ball ball valve with the local force, a long time will cause local wear, to form a complex surface is not consistent, sealing is not caused by strict or damaged.

summary of the invention
The aim of the invention is to overcome the deficiencies of the above technology provides a rotary force by way of making the ball switch, and avoid and reduce the local stress and friction and wear a pair of double wedge type ball valve.  The invention is a double wedge double ball valve valve, a valve body (14), flow in the valve body, the valve seat (16) of the bracket (8), in the valve body and the valve seat corresponding to the ball (15), and the ball rod connected with the valve stem through the valve body, sealing filler, screw and valve stem end the (8) (2) on the hand wheel nut, guide the side stem with L shape of the bracket is fixed with the end of the guide pin is inserted in the guide slot; which is characterized in that the ball is about two ball valve, two ball valve between the upper part and the lower part is a conical open space and the tapered conical space, space and space corresponding to a conical wedge and a lower wedge sphere sphere, wedge upper end and the lower end is fixedly connected with the ball valve, the lower wedge is connected with the valve ball, the ball on the upper or lower end of the valve rod wedge with protruding pin, pin ends are located at two upper ball valve Left lateral groove. The rotating ball valve, by opening and closing when the ball, two ball wedge and drive two ball valve body, the spherical detachment and pressure to the valve seat surface or the corresponding seal ring, force uniform, sealing surface and spherical reduce uneven wear.

The utility model is a schematic diagram of a double wedge type double ball valve

Similarly, the front valve pressure P1 and the post valve pressure P2 pressure differential are reduced, thereby reducing the opening torque, and greatly reducing the sealing surface and spherical wear. The upper and lower two wedge spheres, the upper wedge sphere and the lower wedge sphere correspond to the upper cone space and the lower cone space, and may have a plurality of cones, either square or rectangular cone or cone. The lower end of the lower wedge sphere is connected with the valve body, can be a fixed connection or a rotary connection. The utility model is a square cone or a rectangular cone, such as a ladder shaped, and the lower end of the lower wedge sphere is connected with a valve body to rotate. The wedge ball is rotatablely connected with the valve body, but also to prevent the lower wedge ball body and the ball valve with the surface caused by local wear, wedge sphere with fixed pins extending, fixed pin ends are located at two lower left lateral groove ball valve. The lower wedge ball is rotatablely connected with the valve body, preferably threaded connection, threaded screw direction and the stem on the contrary, the lower end of the screw wedge follows the ball screw and nut, valve inlaid connection, the direction of rotation of the screw thread and the stem of the opposite; so as to make the upper wedge and the lower wedge extrusion and sphere sphere at the same time to loosen or ball valve ball valve extrusion, more able to protect the ball valve and the valve seat sealing surface corresponding to more uniform stress and non local wear of sealing surface.

In order to prevent the excessive opening of the ball flap and prevent the ball valve from being synchronized, the valve rod also has an extended claw type pull cap, and both ends of the claw type pull cap are positioned outside the circumferential surface at the upper end of the two ball valve. In the same way, the lower wedge preferably has an extended claw type pull cap, with both ends of the claw pull cap positioned outside the circumferential end of the two ball valve. To make it easier to ensure the machining accuracy and tolerances, to prevent the wedge sphere and cone space local wear and uneven force, preferably on the sphere and cone wedge wedge and cone sphere space and cone space corresponding to cone.