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Basic concepts of bellows


All installations may be subjected to movements. These movements can vary from very slow (thermal expansion or shrinking movements) to very fast (vibrations). Thermal expansion can result in adverse material stresses in piping. Fitting bellows can prevent these undesired material stresses.

Vibrations can also cause stresses, as well as unpleasant noise in the work and living environment. Fitting bellows can counteract this.

The solution for all these problems is the RX® bellows. The faultless functioning of bellows requires fitting to take place particularly carefully according to the instructions, and the pressure and temperature limits concerned may not be exceeded.

Our knowledge and supply capabilities in this field offer you the opportunity to choose the bellow to optimally meet your requirements.

Use of bellows

To be able to choose the correct bellow account must be taken of the following parameters:

1. Bellow material: metal, rubber, PTFE or fabric.

  • medium
  • pressure
  • temperature

2. Bellow type: axial, lateral, angular

  • type of movement
  • pipe diameter
  • connections
  • fitting length

3. The piping system

  • mounting options
  • piping accessories
  • fixed points
  • guide points


To design the correct fitting situation one must proceed as follows:

  1. calculation of the thermal expansion
  2. determining of the type of movements and their extent; the type of bellow is selected based on this information.
  3. positioning of the bellows, fixed points and guide points
  4. consideration and/or calculation of the initial stress
  5. calculation of the sum of all forces on the fixed points
ERIKS - Bellows pressure-temprature

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