Metal bellows expansion joints offer a cost effective alternative to other expansion devices while optimizing the productive life of a piping system. They are. A: The terminology can be confusing and often words have no universally accepted meaning. We use the following definitions but the terms “bellows” and. An expansion joint/bellow element employed in a piping system is an assembly of generally more than one convolute in series. Also known as. U.S. Bellows, Inc. has been designing and manufacturing engineered pipe and duct expansion joints for the industry since the s and has been a proud. Visit the page for the information about Pipe Expansion Joints, Expansion Joints and Metal Bellows Expansion Joints. There are other terms in use for expansion joints such as expansion bellows, flexible Expansion joints also offer the advantage of reducing stresses in pipe. Expansion joints are used in piping systems to absorb thermal expansion or Bellow you will find a short description of Metallic, Rubber and Teflon® joints. Expansion joints and bellows are used in piping systems. They are made of accessories like flow liners, covers and tie rods. The metal bellows. For tied expansion joints it is not allowed to install them as axial bellows to absorb axial movement. In the piping systems, such as “L”, “Z” and “U” bends they.