What Are The Opening And Closing Processes Of The American Standard Ball Valve?
Ball Valve is opened and closed by the ball rotating around the center line of the valve body.
Opening of ball valve:
① In the closed position, the ball is pressed against the valve seat by the mechanical pressure of the valve stem.
② When the handwheel is turned counterclockwise, the valve stem will move in the opposite direction, and the angular plane at its bottom will cause the ball to separate from the valve seat.
③ The valve stem continues to rise and interacts with the guide pin in the spiral groove of the valve stem, causing the ball to begin to rotate without friction.
④ Until the fully open position, the valve stem is lifted to the limit and the ball rotates to the fully open position.
Closing of ball valve:
① When closing the ball valve, turn the handwheel clockwise, the valve stem begins to descend and the ball separates from the valve seat and begins to rotate.
② Continue to turn the handwheel, the valve stem is affected by the guide pin embedded in the spiral groove on it, causing the valve stem and the ball to rotate 90° at the same time.
③ When it is about to close, the ball has rotated 90° without contact with the valve seat.
④ In the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the pressure ball, pressing it tightly against the valve seat to achieve complete sealing.
