Athulya Bellows & Engineering [P] Ltd. Supplies Externally Pressurized Expansion Joint Bellow. Athulya Bellows & Engineering [P] Ltd. Manufactures metallic expansion bellows / joints / compensators and corrugated hoses. Externally Pressurized Expansion Joint Bellow contains the elements of bellows which are arranged so that they are exposed to the media on their external surface, and are therefore externally pressurized, is an ideal unit. Externally Pressurized Expansion Joint Bellow eliminates squirm as a limitation to the design and permits the safe acceptance of large amounts of axial thermal expansion. These are used when large amounts of axial deflection are required in piping systems of relatively high pressure.