Metal Expansion Joints

Externally Pressurized

MEP Series


MEP Series Externally Pressurized Expansion Joints are designed such that fluid pressure acts on the outside of the bellows.

This model is mainly used in cases of high pressure and large amounts of axial compression and extension. When under external pressure, the bellows will retain its shape and can be manufactured in almost any length.

When using internally pressurized expansion joints and for large movements the system should be divided into subsections, as internally pressurized axial expansion joints tend to become instable with a great length. When the system allows their use, expansion joints with externally pressurized bellows can be used, which permit larger movements, since external pressure tends to stabilize the bellows.


  • Absorbs large amounts of axial compression and extension
  • Eliminates pressure instability
  • Does not restrain pressure thrust
  • Requires main and directional anchors
Externally pressurized expansion joint MEP
Axial non-pressure balanced externally pressurized.

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