The butterfly valve is opened and closed by operating the transmission device to rotate the valve stem, and the valve stem drives the butterfly plate to rotate. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate is connected to the valve stem. The rotation of the valve stem will drive the butterfly plate to rotate to control the flow. The rotation angle is between 0 and 90 degrees. When the butterfly plate rotates to 90 degrees, the butterfly valve is in the fully open position in the pipeline. At this time, only the thickness of the butterfly plate is the only resistance to the fluid passing through, and the flow resistance is very small. At the same time, when the butterfly plate rotates between 0-90 degrees, it can be used to adjust the medium flow.
