BAOYI butterfly valve of building venting is especially designed for dust removal & ventilation and environment protection systems, and the product design can meet such relevant standards as API 609 and EN 593. Generally, the product can be widely applied in smoke discharge systems, dust removal systems, ventilating and warming systems of industrial and mining enterprises and urban fire-fighting facilities for air volume adjustment and control.

·Plate type welded shell structure, small volume and light weight;
·Small eccentric action torque and flexible action; 
·Small flow resistance, strong flow capacity and good adjusting performance;
·Multi-azimuth installation, and without medium flow direction influence.