Butterfly valve in cast iron. To be mounted between flanges acc. to EN 1092-1 type II form B - PN 16/10. The lining in EPDM has an en- capsulated core. Wafer type connection and a top flange for direct mounting of actuators acc. to ISO-5211. Stem bushings in PTFE. Disc is in stainless steel AISI 316. The sealing surface of the disc is polished to minimize the wearing of the rubber lining.