Orbit ball valve is a new structure of the valve, the key to the design of this structure is that it combines the advantages of ball valves and gate valves. The ball valve as the combination of the track ball, which for the wedge between the cone. 5 ° bevel on each side, with a bevel on both sides of the two spherical valve flap. Spherical valve through the flap and the cone-shaped dovetail slot or a T-slot connection between the two sliding each other. Spherical valve flap at the top and bottom of each bit ring and adjust the pads with limited restrictions, so that it can not be with the cone-wedge rise or fall, only at a level space with the cone-wedge to do translation or rotation. Stem through the bottom of thread and pin with the wedge-type cone-solid as a whole, the upper trapezoidal screw and nut with the stem, stem nut rotation by a hand wheel, bevel gear, electric or pneumatic device drivers. The central stem with the track pin, pin mounted to each end of a wheel, wheel-oriented slot in the stent rolling trajectory stem from the orientation slot limit.
The valve is turned on: anti-clockwise rotating hand wheel, through the stem and stem nut to drive wedge cone rising, and that the ball valve to the middle of Shoulong, from the valve sealing surface, and then wedge cone driven ball valve rotated 90 ° the valve opens. Sphere by the mechanical pressure on the role of stem, pressed in the body, when the handwheel counter-clockwise, the stem is the reverse movement, which undocked from the bottom of the angular plane to the sphere seat, stem continues to rise, and with the stem of the guide pin screw slot interaction, so that no friction ball began to spin, until the fully open position, valve stem is raised to the limit position, the sphere rotated to the fully open position.
Valve closed, clockwise rotation hand wheel, valve stem ball to leave the seat began to decline and to begin rotating, helical stem were embedded in their beds on the role of guide pins, so that stem and the ball while rotating 90 °. To the valve closed position, valve stem at the bottom of the angular plane-wedge to the oppression of a mechanical ball to closely pressed seat, and then stretched to both sides of the pan, set their eyes on valve sealing surface, to achieve the valve closed.
Track the trajectory with a gate valve and ball valve characteristics, so its performance not only has the advantages of valve and ball valve. Similarities with the valve are:
1, corrosion-resistant, like with the valve, valve seat and valve sealing surface can be spherical valve welding or spray high hardness, corrosion-resistant alloy material can be applied to a variety of high temperature and pressure and low temperature, corrosion-resistant media pipeline.
2, trip short;
3, the installation space for small: compared with the valve, orbit ball valve compact installation height is small, its installation height is less than the same size gate valve 1 / 3, which will help pipeline layout.
4, opening speed;
5, sealing surface without friction, valves open and close, due to cone up and down movement of the distraction led spherical valve flap or Shoulong, which produces seals and valve sealing surface or separation, so the valve does not produce friction between the sealing surface, sealing performance, long service life.