Check ValveChina Ductile Cast Iron Di Ci Stainless Steel Barss EPDM Seat Water Resilient Wafer Lug Lugged Type Double Flange Industrial Butterfly Valve Gate Swing Check Valves, Find details about China EPDM/NBR/Viton/FKM Lining Seat, Pn10/Pn16/150lb/JIS5K/10K/16K/Butterfly Valve from Ductile Cast Iron Di Ci Stainless Steel Barss EPDM Seat Water Resilient Wafer Lug Lugged Type Double Flange Industrial Butterfly Valve Gate Swing Check Valves