D71 handle clamp-on soft seal butterfly valve can be applied to food, pharmaceutical, chemical and other clean pipelines and industrial environmental protection, water treatment, high-rise buildings, water supply and drainage pipelines for opening and closing or adjusting the flow of media. The butterfly plate of the clamp soft seal butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, the rotation angle is between 0 ° ~ 90 °, and when the rotation reaches 90 °, the valve is fully open.