Flange connections involve fixing two pipes, fittings, or equipment to individual flange disks first, then placing a flange gasket between the disks and securing them together with bolts to complete the connection. Some fittings and equipment come with their own flange disks, which also fall under flange connections. Flange connections are an essential method for pipeline construction. They are convenient to use and can withstand high pressure. In industrial pipelines and within homes, where pipe diameters are small and the pressure is low, flange connections are often not visible. However, in boiler rooms or production sites, flange connections are omnipresent on pipelines and equipment.

The types of flange connections, categorized by their connection methods, include: flat焊接flanges, welding neck flanges, socket welding flanges, slip-on flanges, threaded flanges, blind flanges, ring-type joint flanges, flat ring-type joint flanges, ring grooved flanges, and blind flanges, as well as large diameter flat flanges, large diameter high-neck flanges, and bevel blind flanges, socket welding ring-type joint flanges, etc.