Because the surface of the ball is a uniform arc, when it rotates around the central axis, a static point is set outside it as a reference object, and the distance between the spherical ball and the static point of the reference object will not change no matter how you rotate it. It can be installed in the valve to use its feature to fit well with the sealing ring to prevent pipeline leakage. The lateral diameter of the spherical bead is a straight channel. When rotating, the channel becomes more parallel (coincident) with respect to the pipeline channel. The greater the flow.

With discretionary control. The plug uses the thread pressure method to limit the flow of the pipeline. When the torsion bar is twisted, the flow is changed from large to small and from small to large under the action of the downward or upward rotation of the thread. With discretionary control.

The gate valve is nothing more than cutting into the pipeline to control the flow. Such a design is convenient to block the flow instantly, but it is not suitable for the operation needs of fine-tuning and fine-control. And the tightness of leakage prevention is not easy to control.