System Technology – Axial

Expansion joints in axial pipe systems move parallel to the pipe centerline. This common configuration includes straight piping with main anchors at the end of a run to react pressure force, spring force, alignment guide friction force, and support friction force.


  • Lowest cost expansion joint products
  • Lowest pressure drop if there are no changes in direction
  • No change in direction required


  • Highest system install cost from anchor size and number of alignment guides
  • Highest expansion joint and system forces, including pressure force
  • Highest forces and risk, pressure thrust applies
  • Main anchors required
  • Maximum number of alignment guides
  • Not typically used for hanging or rooftop systems
  • For lower system forces and install costs, consider a lateral system or pressure balance configuration
  • Main anchors, supports, and alignment guides are required for correct operation and safety


  • Tunnel, ground-based, riser, or buried energy distribution systems across large distances where anchors are practically located at ground level or to substantial structures
  • Commercial, Industrial, Power Generation, Petrochemical, Marine, Defense, and Laboratory of all sizes and pressures


8503-8506 Steel Pipe Compensator

8509-8510 Copper Tube Compensator

1501-1506 Single & Dual 3 Ply, Low Area & Liner Bellows Joints

1507-1510 Hyflex Single Bellows Expansion Joints

1507H/G-1510H/G Hyflex Single Hinge or Gimbal Bellows Expansion Joints

1511PBH/G-1512PBH/G Inline Pressure Balanced Universal Hinge or Gimbal Expansion Joint


2504-2507 Low Pressure 1 Ply Bellows Joint

2509-2511 Low Pressure 3 Ply Bellows Joints

25RECT Low Pressure Rectangle Bellows Expansion Joint

3501-3506 Single & Dual 3 Ply Ext. Pres. Expansion Joints


3501IS-3502IS Single Inline Seismic & Settling Ext. Pres. Expansion Joints

4500 V-Flex

5501R-5502R 3 Ply Minimum Length Bellows Connector

6501-6506 Packed Slip Single & Dual Expansion Joints