This kind of butterfly valve is usually called high performance butterfly valve. 1. Structural features: The center of rotation of the valve plate (the center of the valve shaft) forms a dimension “a” offset with the valve plate sealing section, and forms a dimension “b” offset with the centerline of the valve body.

The main reasons for the failure of the sealing performance of the single eccentric sealing butterfly valve: 1. During the opening and closing process of the butterfly valve​, when the valve plate rotates and squeezes the elastic soft valve seat, the valve disc and the valve seat are mechanically worn and scratched;

Features of single eccentric sealing butterfly valve: 1. The structure is more complicated than the centerline sealing butterfly valve​, and the cost is slightly higher;

The sealing principle of single eccentric sealing butterfly valve:1. Structural features: The center of rotation of the valve disc (the center of the valve shaft) is located on the centerline of the valve body, and forms an α dimension offset with the sealing section of the valve disc.

The sealing principle of the centerline butterfly valve is to ensure that the sealing surface has a suitable surface roughness when processing the valve disc, and the synthetic rubber valve seat forms a suitable surface roughness value of the sealing surface during molding.