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Stenflex

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Stenflex

Stenflex is a specialized German manufacturer of flexible pipe connections, rubber compensators, and expansion joints for industrial installations, utilities, and shipbuilding. The company has decades of experience developing connection elements that dampen vibrations, absorb thermal expansion, and compensate for installation tolerances in pressurized liquid and gas systems. At Verkopershulp.nl, more than 720 Stenflex products are available for direct delivery.

The Stenflex core range consists of rubber arch compensators of the STAR and TWIN types, metal bellows expansion joints in stainless steel and carbon steel, fabric expansion joints for high-temperature applications up to 250 degrees Celsius, vacuum-resistant expansion joints, and chemically resistant versions in EPDM, NBR, CR (Neoprene), and FKM (Viton) rubber. The product line covers connection sizes from DN 25 to DN 2000 and pressure classes from PN 6 to PN 40 conforming to DIN EN 1092-1.

Stenflex STAR rubber compensators are single-arch compensators that absorb axial, lateral, and angular movements up to specified maximum values per nominal diameter. The double-arch TWIN version offers increased movement absorption capacity with minimal reaction forces on the connecting structure. Both types are available with loose flanges (PN 10/16), fixed flanges, or threaded connections for straightforward installation in existing piping systems.

For high-temperature applications such as flue gas ducts, combustion air systems, and industrial ovens, Stenflex supplies fabric expansion joints with fiberglass fabric, ceramic insulation packs, and internal liner tubes. These versions withstand continuous temperatures up to 250 degrees Celsius and peak temperatures up to 350 degrees Celsius. Metal bellows expansion joints in austenitic stainless steel are available for high-pressure steam applications and chemical process lines.

At Verkopershulp.nl, you will find the complete Stenflex range including rubber compensators, metal expansion joints, fabric compensators, and accessories such as tie rods and protection plates. Our technical team advises on the correct type selection, nominal diameter, and pressure class based on the installation parameters of your specific application.

Stenflex also offers metal expansion joints in stainless steel and carbon steel for applications where rubber compensators are insufficient, such as at high temperatures above 200 degrees Celsius, high pressures, or aggressive media incompatible with rubber. Stenflex metal bellows are available in multi-layer AISI 304 or 316L design for optimal flexibility and pressure resistance. These metal expansion joints are used in steam installations, nitrogen gas lines, and chemical process installations.

Stenflex applies strict quality control whereby all compensators are hydrostatically tested for leak-tightness before shipment. Product certification per PED 2014/68/EU and Lloyd's Register approval are available for applications requiring certification. Verkopershulp.nl advises on the correct compensator specification based on your medium, pressure, temperature, and movement requirements, ensuring the right choice for your installation.

History

Stenflex was founded in Germany as a manufacturer of flexible rubber pipe connections for industry and utilities. Over the decades, the company expanded its product range from simple rubber compensators to a complete program of flexible connection elements for diverse industrial sectors. Stenflex has built a solid reputation among installers, engineering firms, and industrial customers through high product quality, broad availability, and tailored technical advice. Products conform to international pressure equipment standards and are applied worldwide in water treatment, process installations, shipbuilding, and HVAC systems. Stenflex expanded its product program over the years from exclusively marine applications to a complete industrial range for various market segments. Export to more than 50 countries was enabled by a network of technical distributors and agents, with technical support from Hamburg remaining centralized for all markets.

Product Categories

  • Rubber arch compensators STAR series (single arch)
  • Rubber arch compensators TWIN series (double arch)
  • Metal bellows expansion joints stainless steel
  • Fabric expansion joints for high temperature
  • Vacuum-resistant expansion joints
  • Antistatic ATEX compensators (TRBS 2153)
  • Flange compensators PN 6, PN 10, PN 16
  • Chemically resistant compensators EPDM/FKM/CR
  • Large diameter compensators DN 300 to DN 2000
  • Tie rods and tension rod protection systems
  • Fabric expansion joints for ductwork and fans
  • Connecting flanges and fastening sets

Applications

  • Pump installations and water treatment plants
  • HVAC systems and industrial cooling water circuits
  • Chemical process industry and acid pipelines
  • Sewage and sludge treatment
  • Steam lines and condensate return systems
  • Shipbuilding, offshore, and marine installations
  • Fire water installations and sprinkler networks
  • Industrial cooling towers and condensers
  • Ventilation systems and flue gas exhaust
  • Drinking water pipelines and water distribution
  • Food processing plants and breweries
  • District heating networks and district cooling

Frequently Asked Questions

Which Stenflex compensators are suitable for drinking water?
Stenflex rubber compensators in EPDM rubber are available with WRAS and KTW approval for drinking water applications. The EPDM version is certified conforming to KTW and W270 guidelines for contact with drinking water. When ordering, specify that the compensator is intended for drinking water contact so we can supply the correct certificate.
Up to what temperature are Stenflex compensators available?
Standard Stenflex EPDM compensators are suitable for continuous temperatures from -20 degrees Celsius to +120 degrees Celsius. For higher temperatures, silicone rubber versions (up to 180 degrees Celsius) or fabric expansion joints with fiberglass fabric (up to 250 degrees Celsius continuous, 350 degrees Celsius peak) are available.
How do I correctly install a Stenflex compensator?
Install the compensator stress-free between the flanges: the axis of the compensator must align with the pipe centerline. Use tie rods at operating pressures above 3 bar to absorb axial reaction forces and protect the compensator from over-extension. Do not apply additional stretch or compression relative to the neutral position of the compensator during installation.
What is the maximum working pressure of Stenflex rubber compensators?
Maximum working pressure depends on the nominal diameter and type. Stenflex STAR compensators are available in PN 10 and PN 16 for DN 25 to DN 400. For larger diameters (DN 400-2000), PN 6 to PN 10 applies. Metal bellows expansion joints are available for working pressures up to PN 40. Consult the Stenflex specification tables for your diameter.
Are Stenflex compensators available in ATEX configuration?
For electrically conductive applications in ATEX zones, Stenflex supplies antistatic rubber compensators conforming to TRBS 2153. The antistatic version has a maximum electrical resistance of 10^6 Ohm and prevents the build-up of static electricity in explosive atmospheres. Specify the ATEX zone classification when ordering.
Which rubber is suitable for chemical media?
The choice of rubber material depends on the medium to be transported: EPDM for water, steam, and many chemicals; NBR for oil products and fuels; CR (Neoprene) for ozone- and weather-resistant outdoor applications; FKM (Viton) for aggressive chemicals, acids, alkalis, and solvents. Our specialists assist in material selection.
What is the difference between STAR and TWIN compensators?
The Stenflex STAR is a single-arch compensator that absorbs axial, lateral, and angular movements. The TWIN is a double-arch version with two rubber arches connected by a center flange, allowing larger lateral and angular movements at lower reaction forces. TWIN compensators are used for large displacements or high dynamic loads.
Are Stenflex fabric expansion joints suitable for flue gas ducts?
Yes, Stenflex supplies fabric expansion joints specifically designed for flue gas ducts and combustion air systems. These versions have a fiberglass fabric outer jacket, internal liner tube, and ceramic insulation pack for continuous temperatures up to 250 degrees Celsius. Special versions for temperatures up to 600 degrees Celsius are available on request.