1, the hard seal butterfly valve with three eccentric seal structure, the valve seat and the butterfly plate almost no wear, with the more the more tight sealing function 2, the ring made of stainless steel, with a metal seal and elastic seal dual advantages, both in low temperature And high temperature, have excellent sealing performance, with corrosion-resistant, long service life and so on 3, the butterfly plate sealing surface by welding cobalt-based hard alloy, wear-resistant sealing surface, long life 4, large size Butterfly plate frame structure, high strength, large flow area, flow resistance of small 5, the seal has a two-way sealing butterfly valve function, the installation is not subject to restrictions on the flow of media, but also by the spatial location of the impact can be installed in any direction 6, the drive can be multi-station (rotated 90 ° or 180 °) installation, user-friendly