Sealed structure of self-cleaning surface. When the ball is tilted away from the seat, along the ball's sealing surface into a uniform 360 °, not only the pipe fluid eliminates the high speed of the fluid seat of the slotted parts, valves and joints, but also rushes away the accumulated sealing surface to achieve self- The Wedge seal structure. By the stem of the ball, the ball and wedge seal seat mechanical force ball valve, so the pressure changes the pipe network that sealed ball valve, and in a variety of conditions, the impact of sealing performance is a reliable guarantee. Open and close without friction. This feature of the traditional valve sealing surface completely solves the friction between the seal and the impact of the problem. Closed and reliable valve sealing surface materials widely used plastic, good sealing, has been widely used in vacuum systems. Closed and reliable valve sealing surface materials widely used plastic, good sealing, has been widely used in vacuum systems.