ric butterfly valve adopted three-dimensional eccentric theory design, which idealized the sealing surface’s space motion trail, there is no friction and interference between sealing surface, choose suitable sealing material, all of this guaranteed the triple eccentric butterfly valve’s sealing, corrosion resistance, high temperature resistance and abrasive resistance3,?When the valve is going to be opened, take advantage of disc eccentric features, the disc and seat contact flashily, then br