Orbital hard seal ball valve working principle:

 the principle of CAM makes the valve ball in rotating away from the valve seat sealing surface and pushed valve ball spinning in place before the implementation seating. When the valve is in full open position, turn the handwheel, instantaneous needle in conjunction with the stem nut and thrust bearing, stem began to drop and drive the ball begin to spin. Connect turn the handwheel, the precision of spiral curve groove on the valve stem orbit, interact with embedded in its guide pin, drive the ball with the stem clockwise rotation. When the valve is closed, valve rod drives the ball with the valve seat sealing surface completely without friction rotated 90 °. Continue to turn the handwheel, fall again of the bottom of the stem through the stem of the CAM structure mechanical compression sphere, the sphere seal face closely contact with the valve seat sealing surface, thus achieve the purpose of sealing. Orbital hard seal ball valve counterclockwise rotation handwheel when in a seated position, in the stem nut and with the cooperation of thrust bearing, the valve stem started to rise, and drive the ball begin to spin,. The continuous rotation handwheel, stem will rising at the same time drive the ball to the seats. Orbital hard seal ball valve will open, the precision of spiral curve groove on the valve stem orbit interact with embedded in the guide pin drives the ball with the valve seat sealing surface completely without friction press anticlockwise turn. Continue to turn the handwheel, when the stem up to the limit position, the ball has reverse 90 °with the valve stem, valve is in full open position. Orbital hard seal ball valve structure characteristic: the traditional ball valve, floating or fixed sphere and valve seat contact all the time, switching torque, the sealing surface is easy to damage, track ball on opening and closing, the sphere deflection - the delta Angle first, and then turn to switch sphere and valve seat during the whole process from, so the seat will not be scraped, and open-close torque is small.