Large diameter stainless steel flange with a liner seal. Flanged pipe fittings (flanged pipe fittings) with a flange (flange or plate) of the pipe. It can be made of cast, but also by thread connection or welding composition. Flange, joint (flange, joint) by a pair of flanges, a gasket and a number of bolts and nuts. Gasket on the flange between the two sealing, tighten the nut, the gasket on the surface of the specific pressure to a certain value after the deformation, and fill the sealing surface on the uneven, so that the connection is tightly leaked. The flange connection is a detachable connection. According to the connected parts can be divided into container flange and pipe flange. According to the structure type, there are integral flange, loose sets of flanges and threaded flange. Common flanges are flat welded flanges and butt welds.