Flange connections involve fixing two pipes, fittings, or equipment to separate flange discs first, then inserting a flange gasket between the two flanges and securing them together with bolts, thereby completing the connection. Some fittings and equipment come with a flange disc built-in, which also falls under flange connections. Flange connections are a crucial method in pipeline construction. They are convenient to use and can withstand significant pressure. In industrial pipelines and residential settings, where pipe diameters are small and pressures are low, flange connections are often not visible. However, in boiler rooms or production sites, flange connections are普遍 seen on pipelines and equipment.

Flange connections can be categorized by their connection methods, including: flat焊接 plate flange, necked焊接 flat flange, necked焊接 neck flange, socket焊接 flange, threaded flange, flange cover, neck焊接 ring-type loose flange, flat ring-type loose flange, ring groove face flange and flange cover, large diameter flat flange, large diameter high-neck flange, winged blind flange, welding neck ring-type loose flange, etc.