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D641X-16q 3" DN80 Ductile Iron EPDM Soft-Sealing Pneumatic Flanged Butterfly Valve for Ventilation Dust Removal Exhaust Gas, Find Details and Price about Pneumatic Flange Butterfly Valve Flange Butterfly Valve from D641X-16q 3" DN80 Ductile Iron EPDM Soft-Sealing Pneumatic Flanged Butterfly Valve for Ventilation Dust Removal Exhaust Gas - Fudesheng (Jiangsu) Automatic Control Valve Manufacturing Co., Ltd