Flange ball valve opening process:
法兰球阀的开启过程：
1. In the closed position, the ball is tightly pressed on the seat by the mechanical pressure of the valve stem.
1、在关闭位置，球体受阀杆的机械施压作用，紧压在阀座上。
2, when the counterclockwise rotation of the handwheel, the valve stem is in reverse motion, its bottom corner plane makes the ball out of the seat.
2、当逆时针转动手轮时，阀杆则反向运动，其底部角形平面使球体脱开阀座。
3. Until it reaches the full open position, the valve stem is lifted to the position, and the ball is rotated to the full open position.
3、直至到全开位置，阀杆提升到位置，球体旋转到全开位置。
4, the valve stem continues to lift, and interact with the guide pin in the spiral groove of the valve stem, so that the ball begins to rotate without friction.
4、阀杆继续提升，并与阀杆螺旋槽内的导销相互作用，使球体开始无摩擦地旋转。
