Electric wafer hard seal butterfly valve use, chemical industry, building materials, ventilation, environmental protection engineering in power plant, glass and other industries of cold or hot air with dust in the gas pipeline, the gas medium flow adjusting or cutting device of this butterfly valve is adopted the midline type disc plate and short structure is a new type of structure design and manufacture of the steel plate welding, compact structure, light weight, easy installation, small flow resistance, big circulation, avoid the influence of high temperature expansion, convenient operation. No connecting rod, bolt and so on, reliable work, long service life. Can be installed at multiple stations, not affected by medium flow direction.