... is a mechanical part which used for connecting pipe.Flange Type: Welded flange, Welding neck flange, Male and female ... The public diameter: 6 ~ 4000mm c, Flange structure type: welding, socket welding, threaded connection, loose, butt weld and blind flange d, Flange ... Unit flange a, threaded flange b, welding flange, welding neck flange, welding neck flange, socket weld flange with neck , slipon plate ...