Insulation ball valve working principle

An opening process

1 in the closed position, sphere subjected to mechanical pressure of the stem, press on the seat.

2 when turning the handwheel counterclockwise, the valve stem is a reverse movement, the Angle at the bottom of the plane to make the ball off the seat.

3 stem continue to ascend, and valve stem guide pin of interaction in the spiral groove, the sphere began to rotate without some friction.

Until 4 to full open position, the valve stem to limit position, sphere rotation to the fully open position.

Second, the shutdown process

1 closing, rotating the handwheel clockwise, stem began to drop and the ball left seat to begin to spin.

2 continue to rotate the handwheel, the valve stem is embedded in the spiral groove on the role of the guide pin, the stem and ball rotate 90 ° at the same time.

3 is close to closing, the sphere has been without contact with the valve seat rotated 90 °.

4 wheel rotation of the last few laps, stem mechanically wedge Angle at the bottom of the plane to the oppression of a sphere, make its strong pressure on the seat, to completely seal.