Flange connections involve fixing two pipes, fittings, or equipment to each side of a flange, inserting a flange gasket between them, and then securing them together with bolts, thereby completing the connection. Some fittings and equipment come with a built-in flange, which also falls under the category of flange connections. Flange connections are a crucial method in pipeline construction. They are convenient to use and can withstand high 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, you'll find flange connections on pipes and equipment everywhere.

The types of flange connections, categorized by their connection methods, include: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, flange covers, ring-type joint flanges, loose flanges with socket welding rings, loose flanges with flat welding rings, ring groove flanges, and flange covers, large diameter flat flanges, large diameter high-neck flanges, winged blind flanges, and socket welding loose flanges, etc.