Flange connections involve fixing two pipes, fittings, or equipment to separate flange plates first, then placing a flange gasket between the two plates and securing them together with bolts, thereby completing the connection. Some fittings and equipment come with built-in flange plates and are also considered 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, you may not see flange connections when the pipe diameter is small and the pressure is low. However, in boiler rooms or production sites, flange connections are prevalent among pipes and equipment.

According to the connection method, flange types can be classified as: flat焊接flanges, socket焊接flanges, welding neck flanges, lug焊接flanges, threaded flanges, flange covers, welding neck ring loose flanges, flat ring loose flanges, ring groove flanges and flange covers, large diameter flat flanges, large diameter high neck flanges, L-shaped blind flanges, and welding neck loose flanges, etc.