The working principle of the track hard sealed ball valve: the principle of the CAM makes the valve ball break away from the sealing surface of the seat in the rotation, and then push the valve ball to the seat to achieve seal after the rotation is in place. When the valve is in the full open position, the instantaneous needle turns the handwheel, and the valve stem begins to drop and drive the ball to start rotating under the combination of the valve stem nut and the thrust bearing. Connected to the rotating handwheel, the precision spiral curve groove track on the valve stem interacts with the guide pin embedded in it, driving the ball with the valve stem constantly in the clockwise direction. When the valve is about to close, the stem drives the ball to rotate 90° without friction with the sealing surface of the seat. Continue to rotate the handwheel, and the valve stem falling again mechanically presses the ball through the CAM structure at the lower end of the valve stem, so that the ball sealing surface is in close contact with the sealing surface of the seat, so as to achieve the purpose of sealing. When the track hard sealed ball valve is in the fully closed position, turn the handwheel counterclockwise. Under the cooperation of the valve stem nut and the thrust bearing, the valve stem begins to rise and drive the ball to start rotating. Continuously rotating the handwheel, the valve stem will drive the ball to the seat while rising. When the ball valve is about to be opened, the precision spiral curve track on the valve stem interacts with the guide pin embedded in it to drive the ball to rotate in the counterclockwise direction without friction with the sealing surface of the valve seat. Continue to turn the handwheel, when the stem rises to the limit position, the ball has also reversed 90 degrees with the stem, and the valve is in the fully open position. Track hard sealed ball valve structure characteristics: traditional ball valve, whether floating or fixed, the ball and the seat always contact, switching torque is large, the sealing surface is easy to damage, the track ball on the opening and closing, the ball first deflection -δ Angle, and then rotation, the whole process of the ball and the seat is removed, so the seat will not be grazed, and the opening and closing torque is small.
