Universal Tied Rod Expansion Joints

Features of Tied Design:

  • Simple design, Relatively low cost
  • The universal configuration can be designed with a very low lateral spring rate and high lateral movement capacity
  • Versatile and common throughout all industries
  • Two degrees of movement capability for tied single or universal design
  • Three degrees of movement for two tie rod design
  • Tie rods contain pressure thrust

Benefits of tied design:

  • Pressure thrust is accommodated by hardware, external anchorage is only required for spring forces
  • Can be designed with very low lateral spring rate

If a large lateral offset is required a tied universal EJ is an appropriate choice. In this case there are two identical bellows elements separated by a center spool with tie rod hardware traversing both bellows elements. To accommodate lateral offset each bellows element tilts. The tied universal EJ can support two degrees of motion, just like the tied single EJ.

The amount of lateral offset is only limited by the distance between the bellows elements and the overall length of the assembly. The separation of the bellows elements also results in a very low lateral offset spring rate.
As with the single tied EJ, if just two tie rods are used, the configuration allows for three degrees of movement, lateral in two axes and angular about one axis.