815,830, the series butterfly valve of the main structural features of the right folder-flange three eccentric structure, and 815, 830L Series butterfly valve of the main characteristics of the valve structure around with protruding ears which is designed with single-screw flange structure. 815,830 Series butterfly valve is widely used in petrochemical and water treatment and industrial environmental protection, high-rise buildings, to a drainage pipe. Its characteristics : Because the three eccentric structure, confined reliable performance to ensure that opened butterfly no contact with the sealed Block, Block sealed to eliminate the uneven load, extending the service life, and ensure reliable sealing performance, temperature, resistance to wear, Corrosion-resistant advantages.