The double offset butterfly valve rotation center of the valve plate (i.e., the center of the valve shaft) forms an offset of dimension A from the sealing section of the valve plate, and forms an offset of dimension B from the center of the valve body.

The double eccentric butterfly valve structural feature is that the axis of the valve stem is deviated from the center of the butterfly plate and the center of the body. The double eccentric effect enables the butterfly plate to quickly separate from the valve seat after the valve is opened, greatly eliminating unnecessary excessive extrusion and scratching between the butterfly plate and the valve seat, reducing the opening resistance, reducing wear, and improving improves valve seat life. The scratching is greatly reduced, and the double eccentric butterfly valve can also use a metal valve seat, which improves the application of butterfly valves in high temperature fields.