Flange, also known as Flange Flange Flange plate or Flange. Flange is the pipe and pipe connected to each other parts, used for the connection between the pipe end; there are also used in the equipment import and export flange, used for the connection between the two equipment, such as reducer flange. Flange connection or flange joint refers to the Flange, gasket and bolts are connected with each other as a group of combination of sealing structure of the detachable connection. Pipeline flanges refer to flanges for piping installation and for equipment, refer to import and export flanges for equipment. There are holes in the Flange, and the bolts make the two flanges close together.