... 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 ... DIN2631, 2632, 2633, 2634, 2635Usage: connecting pipe line and keep its leakproofness; convenient ... easy to seal pipe lineApplication area: Connecting various pipelines, which convey gas, water ...