Three-piece ball valve working principle

The three-piece ball valve works as follows:

First, open the process

1. In the closed position, the ball is pressed by the valve stem and pressed against the valve seat.

2. When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular plane disengages the ball from the valve seat.

3. The valve stem continues to lift and interacts with the guide pin in the spiral groove of the valve stem so that the ball begins to rotate without friction.

4. Until the fully open position, the stem is raised to the extreme position and the sphere rotates to the fully open position.

Second, close the process

1. When closed, rotate the handwheel clockwise and the stem begins to lower and the ball moves away from the seat.

2, continue to rotate the hand wheel, the stem is embedded in the guide groove on the spiral groove, so that the valve stem and the ball simultaneously rotate 90 °.

3. When the ball is about to close, the ball has rotated 90° without contact with the valve seat.

4. In the last few rotations of the handwheel, the angular plane at the bottom of the valve stem is mechanically wedged against the ball so that it presses tightly against the valve seat to achieve complete sealing.