Technical Data

Bellows materials:

Stainless steels:
1.4541, 1.4404, 1.4571

Heat-resistant steels:
1.4828, 1.4878

Available nominal widths and pressure stages:

Nominal width: DN 15 – 3400
Pressure stages: PN 1 – 16

Types of connection:

Flange made of
1.0038, 1.4404, 1.4541, 1.4571, 1.0425, 1.0460

Weld-on ends made of
1. 0038, 1.4404, 1.4541, 1.4571, 1.0345, 1.5415

Threaded connections made of
1.0345, EN-6JMW-400-5, 1.4571

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

Steel expansion joints

Safe construction elements thanks to high compressive strength and thermal endurance

STENFLEX® steel expansion joints are designed and built using the latest CAD techniques. Our design engineers simulate form, function and installation prior to commissioning. The result is steel expansion joints which couldn’t be easier to assemble and are fully equipped to withstand the stresses they will face during downstream operation.

STENFLEX® steel pipe connectors have above-average durability. Most of our steel expansion joints have been in use for decades. They ensure trouble-free operation. Example applications include mechanical engineering, industrial equipment construction and pipeline construction. In the chemicals industry, plant engineering, gas and water supply, building services engineering and exhaust systems engineering, too. Flexible STENFLEX® steel expansion joints have been popular and reliable construction elements for many years.

What STENFLEX® steel expansion joints do:

  • Compensate motion
  • Compensate expansion
  • Reduce tension
  • Damp vibration and noise transmissions
  • Compensate ground and foundation settling
  • Compensate inaccurate assembly
  • Serve as dismantling joints on fittings

Difference between expansion joints on the basis of movements

Axial expansion joints

Structure: Steel bellows with adapters (flange, weld-on end or thread).

Movement absorption: Axial shifting and minor movements on all sides of the expansion joint can be absorbed. Axial expansion joints with two steel bellows 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 expansion joints

Structure: Steel bellows with lateral motion tensioning system and flanges or weld-on ends.

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. Lateral expansion joints with two steel bellows and a distance pipe are used to absorb significant movements.

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

Angular expansion joints

Structure: Steel bellows with tie bar and flanges or weld-on ends The centre of rotation of the tie bar is located in the centre of the bellow.

Movement absorption: Angular movements of the expansion joint can be absorbed. The angular joints regulate a defined angular movement, absorb axial stresses and relieve the load on the pipeline fixed points. A distinction is made between hinged angular expansion joints (angular movement of the bellows is diverted on one level) and cardan-joint angular expansion joints (angular movement of the bellows is diverted on two levels).

Fixed points: Only light fixed points are required to absorb angular displacement and friction torques.