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The structural feature of triple offset butterfly valves: the conical axis of the disc is skewed to the axis of the body cylinder. The sealing section of the disc is no longer a true circle, but an ellipse. The sealing surface of triple offset butterfly valves is asymmetrical in shape, with one side inclined to the center line of the body and the other side parallel to the center line of the body.
The three eccentricity changes the sealing structure, which relys not on the elastic deformation of the valve seat, but on the contact surface pressure of the valve seat to achieve the sealing effect, avoid the problem of zero leakage and high temperature resistance of the metal valve seat, and it is widely used in power stations, chemical plants, steel mills, etc.