Ball valve is a new type of structural valve, the key to the design of this structure is that it combines the advantages of ball valves and gate valves. Orbital ball valve ball for the combination of sphere, the middle of the wedge cone. 5 ° bevel on each side and two spherical discs on both sides with bevel. The spherical disc and the cone are connected by a dovetail or t-slot, and the two can slide with each other. Ball valve above and below the limit ring and the adjustment pad, respectively, so that it can not with the wedge cone rise or fall, only in a horizontal space with the wedge cone to make translational or rotational movement. The lower end of the valve rod is fixed with the wedge cone through the thread and the pin shaft, the upper trapezoidal thread is matched with the valve stem nut, and the rotation of the valve stem nut is driven by a hand wheel, a bevel gear, an electric or pneumatic device. The middle of the valve stem is provided with a track pin, a roller is mounted on each end of the pin, the roller can roll in the guide slot of the bracket, and the movement path of the valve rod is limited by the guide slot. When the valve is open, rotate the handwheel counterclockwise to drive the wedge cone to rise through the stem nut and stem to retract the ball valve to the center, and then release from the sealing surface of the valve body. The wedge cone then rotates the ball valve to rotate by 90 ° The valve is open. Sphere by the valve stem of the mechanical pressure, the pressure on the valve body, when the counterclockwise rotation of the hand wheel, the valve stem is reverse movement, the bottom of the angular plane so that the ball off the valve seat, the valve stem to continue to enhance and The guide pin in the helical groove of the valve stem interacts so that the ball starts to rotate frictionless until it reaches the fully open position and the valve stem is raised to the limit position and the ball rotates to the fully open position. When the valve is closed, turn the handwheel clockwise and the stem begins to descend and the ball leaves the seat to start rotating. The stem is guided by the guide pin embedded in the spiral slot above it, causing the stem and sphere to rotate 90 ° at a time. To the valve closed position, the bottom of the valve rod angular plane of the mechanical wedge compression ball, it tightly pressed on the valve seat, and then to both sides of the translation distraction, close to the valve sealing surface, the valve closed. Trajectory ball valve trajectory with a valve and ball valve features, so the performance of both gate valve and ball valve advantages. Similarities with the gate valve are: 1, corrosion-resistant valve with the same, the valve seat and spherical valve sealing surface can be surfacing or spraying high hardness, corrosion-resistant alloy material can be applied to a variety of high temperature and pressure and low temperature, corrosion-resistant Medium pipe; 2, short stroke; 3, the installation space is small: compared with the gate valve, the track ball valve structure is compact, the installation height is small, the installation height is less than 1/3 of the valve with the specifications to help the pipe layout; 5, sealing surface friction, the valve opening and closing, due to the cone up and down movement of the spherical valve propped open or close, and seal the valve body sealing or separation, so the valve sealing surface does not produce friction, sealing performance Good, long service life.