It has features of compact structure, 90° rotary switch easy, reliable sealing and long service life. The high-performance wafer butterfly valve adopts advanced foreign technology and adopts a double eccentric butterfly plate with a spherical surface, paired with a single piece flexible lip sealing seat. It is suitable for valves that require reliable sealing and good adjustment characteristics. The valve has tight sealing performance and long service life, can be used for fast cut off or flow adjustment.