The types of flanges and using range

1, The types of flanges according to the national norm: integral flange, threaded flange, weld neck flange, with flat welding neck flange, Socket Weld neck flange, butt welding band neck loose flange, plate, Slip on flange, butt welding plate loose flange rings, flat welding ring plate loose flange, flange ring plate loose flange, flange cover.