As we all know, we usually install pneumatic butterfly valves in the diameter direction of the pipeline, while the butterfly valve body is located in a cylindrical channel. When the disc type butterfly plate starts to rotate around the axis, that is, the rotation angle is 0-90 degrees, it means that the valve is fully open. In addition, it should be noted that the vertical direction is generally not selected, but the horizontal direction. 　　

Manufacturer of electric butterfly valve: butterfly valve can be divided into reference point flat type, vertical flat type, inclined flat type and rod type according to its structure. According to the sealing mode, it can be divided into two types, namely, relatively sealed type and hard sealed type.