Wafer type butterfly check valve center discsPFA/FEP discs with metal supportRayflon custom fabricate a series of butterfly ... valve components including liners/seats, discs, stem packing and other sealing gaskets in a variety ... - White or green colorNBR, EMDM, VITON - Black colorMaterials of discs:Metal: stainless steel, carbon steel, cast ironLiner: PFA, FEPSpecifications: DN50 ...