Ring Flange

The ring flange is a special flange type that includes an extra sealing element sandwiched between the two plate faces. A shallow groove is machined into the flange plate faces, typically towards the center of the plate below the row of tensioning holes. Ring flanges usually come in sets that include a separate sealing ring of the same dimensions as the groove. These rings may be made of rubber compounds, fiber, or soft steel, and are round or square in cross section. They are also of a slightly larger diameter than the combined depths of the two grooves.