... Flange, Slip-On Flange (SO), Socket Welding Flange, Lap Joint Flange (LJF), Welding Neck Flange (WNF), Blind Flange, Orifice Flange, Reducing Flange, Pad Type Flange, Loose Hubbed Flange, Welding Plate Flange ... : Equal Usage: connecting pipe line and keep its leakproofness; convenient for replacing pipe line; easy to separate and check the situation ...