Ketta BFDDA series pneumatic air operated ductile iron butterfly valve (double acting) 16 bar (232 psi) EPDM seals - all sizesKetta BFDDA series pneumatic air operated ductile iron butterfly valve (double acting) 16 bar (232 psi) Size 50 mm to 600 mm Body FBE coated ductile iron Seat EPDM or FKM Disc 316 stainless steel Pressure up to 16 bar (depending upon size) Actuation double acting pneumatic EPDM seals (optional FKM Viton type) The BFD (supersedes the BFK) series has a ductile iron body, 316 S. S disc, EPDM seat (as standard but also available in FKM) and a double