Introduction and opening of flange ball valve

The flange ball valve adopts a wedge-shaped sealing structure, which mainly relies on the mechanical force provided by the valve stem to press the ball wedge to the valve seat and seal, so that the sealing property of the valve is not affected by the change of the pressure difference of the pipeline, and the sealing performance under various working conditions There are reliable guarantees. The implementation of the flange ball valve opening and closing friction-free solution can successfully solve the problem that the traditional valve affects the sealing due to the mutual friction between the sealing surfaces.
Worm gear American standard flange fixed ball valve
Flange ball valve opening process
1 In the closed position, the ball is pressed by the mechanical pressure of 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 the bottom angular plane causes the ball to disengage from the valve seat.
3 The valve stem continues to lift and interacts with the guide pin in the screw groove of the valve stem, causing the ball to start rotating without friction.
4 Until the fully open position, the stem is raised to the extreme position and the ball is rotated to the fully open position.
Flange ball valve closing process
1 When closing, turn the handwheel clockwise, the valve stem begins to lower and the ball moves away from the seat.
2 Continue to rotate the hand wheel. The valve stem is subjected to the guide pin embedded in the upper spiral groove, so that the valve stem and the ball rotate at 90° at the same time.
3 When it is about to close, the ball has rotated 90° without contact with the seat.
4 In the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the ball, causing it to press tightly against the valve seat for a complete seal.