Flange connections involve securing two pipes, fittings, or equipment to separate flange plates first, then placing a flange gasket between the two plates and tightening them together with bolts to complete the connection. Some fittings and equipment come with a built-in flange plate, which also falls under flange connections. Flange connections are an important 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 the pressure is low, flange connections are not visible. However, in boiler rooms or production sites, you'll find flange connections on pipes and equipment everywhere.

According to the type of connection, flange connections can be categorized as: flat welding flanges, socket welding flanges, blind flanges, threaded flanges, flange covers, loose sleeve flanges with neck and socket welding, flat sleeve flanges, ring groove flanges, large diameter flat flanges, large diameter high-neck flanges, gull wing blind flanges, and loose sleeve flanges with socket welding.