Flange is also called flange or flange plate. The flange is the part that connects the pipe with the pipe, is connected to the end of the pipe, the flange has holes, and the bolt makes the two flanges tightly connected. The flange is sealed with a gasket. The function of the flange is easy to disassemble and assemble, and the application fields are mainly, petroleum, chemical industry, electric power, water conservancy, coal mine, water supply, heating, gas supply, natural gas, ships, large infrastructure, and offshore water platforms.