Hinged Expansion Joints

When the angular movement is only in one plane hinge expansion joints or angular expansion joints are used. An angular expansion can be expressed when an expansion joint experience bending about its center which is the centerline and half way between the ends of metal bellows.

These types of expansion joints are used mostly in sets wherever piping direction changes. So you will find hinged expansion joints used at the locations where pipe bending occurs. Due to the hinged nature of this bellow only angular movement is allowed around the hinges. Since lateral movements too take place so there is a piping joint between these 2 bellows. The amount of lateral deflection a hinged expansion joint can accommodate for a given angular movement is directly proportional to the distance between them. To use a pair of hinged bellows effectively the distance between them should be made as large as possible. When only two hinge expansion joints are used as shown in the adjacent figure the piping perpendicular to the hinge segment must deflect to absorb the thermal expansion of the spool containing these angular expansion joints.

When the piping in a single plane system is not flexible enough to absorb the thermal expansion of the spool between the hinged joints a system of three hinged expansion joints may be used. In this system the combination of the three joints absorbs all the thermal expansion of the piping system and no deflection of the piping is observed. This system produces the lowest possible forces on the intermediate anchors and guides

If the thermal growth in the Piping System occurs in only one plane the use of this joint provides the most efficient solution to absorb the thermal deflections.


  • All pressure thrust is held by the hinge pins and is not imposed on pipes work, anchors or equipment.
  • Forces that deflect the bellows are minimal.
  • The hinged expansion joints are also typically compact in size and are structurally rigid.
  • Guides are not found necessary on short pipe runs like in boiler house systems. For long pipe runs, only the simple type of pipe guides are applied.
  • A single pair of hinged expansion joints has the ability to absorb enormous amounts of decompressions or expansions, hence, providing to considerable savings in the guides, anchors, and actual joint cost.
  • Applications:

  • Industrial piping systems
  • In aerospace components

  • Hinged Expansion Joints Manufacturer In India

    + 91 - 70289 97949
    + 91 - 98904 54224
    + 91 - 98909 77244
    Address: Final plot no.38/1 Ramtekdi Industrial Estate, Hadapsar, Pune - 411013, Maharashtra, India