Why are Metal Expansion Joints Important?

Where piping designs are subject to changes in temperature, pressure, vibration, compression extension, cyclical movements or movements required in usage, flexible metal hose and metal expansion joints, in tandem or alone, are needed to preserve the integrity of your system.

Factors Determining the Selection of Bellows

Untied Expansion Joints

Tied Expansion Joints

  • Axial Expansion Joints — Singular or dual bellows with installation fittings only
  • Double Expansion Joint — Commonly used for low-pressure service
  • Internally Guided Expansion Joint — Simple design = less expensive
  • Untied Universal Expansion Joints — All degrees of freedom (axial, lateral, angular)
  • Pressure Balanced Expansion Joint — Anchors affected by bellows spring rate and pressure thrust = higher force
  • Hinged Expansion Joints — Single or dual bellows with restraining hardware
  • In-line Pressure Balance Expansion Joint — Typically used for high-pressure service
  • Gimballed Expansion Joints — Limited degrees of freedom
  • Tied Single & Universal Expansion Joints — Anchors only affected by bellows spring rate = low force