Our factory there to solve pressing problems concentric butterfly valve plate and valve seat, thus buy a lot of Triple offset butterfly valve, the structure is characterized by the stem axis deviated from the center of the disc so that the lower end of the butterfly board no longer a rotary axis, dispersion, thereby reducing the excessive compression plate and seat the lower end of the butterfly. On the basis of a single eccentric butterfly on further improvement of molding it is currently the most widely used Triple offset butterfly valve. Triple offset butterfly valve, high temperature, you must use the hard seal, but the leak volume; to zero leakage, must use the soft seal, but not heat. To overcome this contradiction double eccentric butterfly valve, butterfly valve again for the third time eccentric. The so-called third eccentric, is not a positive shape Sealing cone, but taper.