... flanges, rubber joint, single-sphere, double-sphere, twin sphere union 1) Butt-welded fittings, flanges, rubber joint, single-sphere, double ... and ductile iron butterfly valves, gate valves, globe valves, check valves, Y-strainers 3) Ductile iron fittings, cam locks ... valves, flange connecters, gate valves, stop valves, butterfly valves, check valves and Y-strainers 5) Various kinds of stainless steel ...