three eccentricity metal hard seal butterfly valve sealing characteristic is not dependent on the elastic deformation of the seat, but completely using the seat of the contact pressure to achieve sealing effect. Three eccentricity metal hard seal butterfly valve can be used for high temperature and high pressure, high wear resistance. The structure characteristics of triple eccentric butterfly valve, when eccentric eccentric valve rod eccentric shaft, disc sealing surface of the cone axis deviating from the main body of the cylinder axis. After the third eccentric butterfly plate seal section is no longer round, but the oval, so the shape of the seal face is asymmetric. Tilt in the subject line, the other side of the line parallel to the main body. Triple eccentric butterfly valve is fundamentally changing the way the characteristics of seal structure, the position is no longer a seal, seal, but torque is not dependent on the elastic deformation of the seat, but completely using the seat of the contact pressure to achieve sealing effect. The sealing design can solve the problem of metal butterfly valve seat leakage, due to the contact pressure is proportional to the medium pressure, butterfly can also withstand gate valves, globe valves and metal hard seal ball valve and other high temperature high pressure, extended the scope of use.

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