Technical Data

Bellows material:

PTFE

Available nominal widths and pressure stages:

Nominal width: DN 25 – 500
Pressure stages: PN 6 – 10.5

Types of connection:

Flange made of
1.0038, 1.4541, 1.4571

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STENFLEX<sup>®</sup> PTFE expansion joints

PTFE expansion joints

Universally resistant to virtually all chemicals and solvents

The outstanding property of STENFLEX® PTFE expansion joints is their astounding resistance to aggressive chemicals and solvents. Accordingly, they are used primarily in the chemicals and pharmaceuticals industries, as well as in the foodstuffs and beverages industries. STENFLEX®’s non-sensitive PTFE expansion joints have also proven their worth in the pipeline systems operated by waste disposal and treatment companies.

All STENFLEX® PTFE expansion joints have absorbent, compensating and tension‑reducing properties. Furthermore, white PTFE bellows are not electrically conductive and thus can be used as insulators. Black PTFE bellows, on the other hand, are the solution of choice in hazardous areas, since the inclusion of carbon black prevents static charge.

What STENFLEX® PTFE expansion joints do:

  • Compensate motion
  • Compensate expansion caused by differences in temperature
  • Reduce tension
  • Damp oscillation, noise and vibration transmissions
  • Compensate imprecise assembly

Difference between PTFE expansion joints on the basis of movements

Universal PTFE expansion joints

Structure: Bellows with adapters (hinged flange)

Movement absorption: Axial, lateral, angular as well as superimposed movements can be absorbed. Universal expansion joints with distance pipe are used to absorb significant movements.

Fixed points: Stable pipeline fixed points, and a correct and proper pipeline, are required to absorb axial forces.

Lateral PTFE expansion joints

Structure: Bellows with lateral motion bracing system and flanges

Movement absorption: Lateral shifting of the expansion joint can be absorbed. The tensioning system absorbs axial stresses and relieves the load on the pipeline fixed points.

Fixed points: Only light fixed points are required to absorb lateral displacement and friction forces.