STENFLEX® rubber expansion joints – quality and flexibility
We offer a wide selection of elastic rubber expansion joints from the renowned manufacturer STENFLEX®. These expansion joints are made of high-quality rubber and are designed to withstand both high pressure and demanding operating conditions.
HNC Group markets a comprehensive range of rubber expansion joints for professional users in industry – with fast delivery and first-class technical advice.
STENFLEX® rubber expansion joints are certified and approved by a number of recognised classification and certification bodies. They have undergone extensive national and international tests of both components and performance, which ensures their high quality and reliability.
R-1
Universal rubber expansion joint
Universal expansion joint, consisting of a rubber bellows with swivel flanges.
| Standard overall length: | 130 mm. |
| Standard dimensions: | DN 25 – DN 300 |
| Max. working pressure: | PN 16 |
| Temperature: | 90°C, briefly up to 100°C |
| Materials: | Synthetic reinforcement in EPDM, NBR or CIIR (Butyl) |
A-1
Axial rubber expansion joint
Universal expansion joint, consisting of a rubber bellows with swivel flanges.
| Standard overall length: | View datasheet |
| Standard dimensions: | DN 20 – DN 1000 |
| Max. working pressure: | PN 16 |
| Temperature: | 90°C, briefly up to 100°C |
| Materials: | Synthetic reinforcement in EPDM, NBR or CIIR (Butyl) |
AS-1
Universal rubber expansion joint
Universal expansion joint, consisting of a rubber bellows with swivel flanges.
| Standard overall length: | 125 mm. – 200 mm. |
| Standard dimensions: | DN 25 – DN 400 |
| Max. working pressure: | PN 16 |
| Temperature: | 110°C, briefly up to 130°C |
| Materials: | Synthetic reinforcement in EPDM or NBR |
Expertise and quality behind every single connection
STENFLEX® has for 50 years been a leader in terms of innovation and expertise. Their engineers combine experience and expertise from more than five decades, during which they have held a leading market position in flexible pipe connections. Their products are of first-class quality and very durable, and are known for innovation, quality, performance and sustainability.
A-2 / A-4
Lateral rubber expansion joint
Lateral expansion joint, consisting of a rubber bellows with swivel flanges and tie rods (externally tightened) to absorb reaction forces caused by the internal pressure or vacuum.
| Standard overall length: | View datasheet |
| Standard dimensions: | DN 20 – DN 1000 |
| Max. working pressure: | PN 16 |
| Temperature: | 90°C, briefly up to 100°C |
| Materials: | Synthetic reinforcement in EPDM, NBR or CIIR (Butyl) |
R-2
Lateral rubber expansion joint
Lateral expansion joint, consisting of a rubber bellows with swivel flanges and externally tightened tie rods to absorb reaction forces.
| Standard overall length: | 130 mm. |
| Standard dimensions: | DN 25 – DN 300 |
| Max. working pressure: | PN 16 |
| Temperature: | 90°C, briefly up to 100°C |
| Materials: | Synthetic reinforcement in EPDM, NBR or CIIR (Butyl) |
AS-2 / AS-4
Lateral rubber expansion joint
Lateral expansion joint, consisting of a rubber bellows with swivel flanges and tie rods (externally tightened) to absorb reaction forces caused by the internal pressure or vacuum.
| Standard overall length: | 125 mm. – 200 mm. |
| Standard dimensions: | DN 25 – DN 400 |
| Max. working pressure: | PN 16 |
| Temperature: | 110°C, briefly up to 130°C |
| Materials: | Synthetic reinforcement in EPDM or NBR |
MS-1
MS-1 is a universal flame-proof flexible connection consisting of a double bellows with swivel flanges.
This type can absorb large movements while weighing less than a traditional solution with 2 expansion joints fitted with an anchor between them. On ships in particular there may be a need for this solution.
MS-1 can be supplied with an EPDM or NBR bellows and is fitted with an EN1092 flange as standard, with the option of the various other flange types available on the market.
| Standard overall length: | 220 mm. – 275 mm. |
| Standard dimensions: | DN 65 – DN 250 |
| Max. working pressure: | PN 16 |
| Temperature: | 110°C, briefly up to 130°C |
| Materials: | Synthetic reinforcement in EPDM or NBR |
A-3
Angular rubber expansion joint
Angular expansion joint, consisting of a rubber bellows with flanges With hinge joint to counteract reaction force or vacuum.
| Standard overall length: | 125 mm. – 300 mm. |
| Standard dimensions: | DN 32 – DN 1000 |
| Max. working pressure: | PN 16 |
| Temperature: | 90°C, briefly up to 100°C |
| Materials: | Synthetic reinforcement in EPDM, NBR or CIIR (Butyl) |
GR-SAE
Universal rubber expansion joint
Universal expansion joint, consisting of a rubber bellows with swivel flanges.
| Standard overall length: | 100 mm. – 130 mm. |
| Standard dimensions: | DN 32 – DN 125 |
| Max. working pressure: | PN 16 |
| Temperature: | 110°C, briefly up to 130°C |
| Materials: | Synthetic reinforcement in NBR |
GRV
Rubber-metal unit
The rubber-metal pipe connection consists of a cylindrical rubber body with moulded-in flanges.
The flanges have threaded bolt holes.
No metallic connection between the flanges.
From DN50, elastic spacers are built in.
| Standard overall length: | 70 mm. – 90 mm. |
| Standard dimensions: | DN 20 – DN 200 |
| Max. working pressure: | PN 10 |
| Temperature: | -30°C – 100°C, briefly up to 110°C |
| Materials: | Synthetic rubber in CR |
AG-5
Universal rubber expansion joint
Universal expansion joint, consisting of a rubber bellows with threaded ends.
Female or male thread Combination of female/male thread.
| Standard overall length: | 200 mm. |
| Standard dimensions: | DN 20 – DN 50 |
| Max. working pressure: | PN 16 |
| Temperature: | 90°C, briefly up to 100°C |
| Materials: | Synthetic reinforcement in EPDM, NBR or CIIR (Butyl) |
TU
Universal rubber expansion joint
Reiflexa TU EPDM bellows expansion joint with galvanised union socket connection. Reiflexa TU is made with a double bellows, which provides optimum and flexible movements in all directions.
| Standard overall length: | 120 mm. – 152 mm. |
| Standard dimensions: | DN 20 – DN 50 |
| Max. working pressure: | PN 10 |
| Temperature: | 80°C |
| Materials: | EPDM |
Rubber expansion joints and flexible connections for industrial piping systems
A rubber expansion joint is a flexible connecting component used to absorb movements, vibrations and stresses in piping systems. At HNC Group we have many years of experience and specialist knowledge in flexible connections, having advised on and supplied rubber expansion joints to a wide range of industries. Whether it is a new build or the replacement of existing expansion joints, we are a competent and reliable partner.
We always take the individual project as our starting point and assess factors such as pressure, temperature and the medium in question in order to find the optimum solution. In many cases, a custom rubber expansion joint may be necessary to ensure operational reliability and a long service life.
Rubber expansion joints from HNC Group
We supply rubber expansion joints in various sizes and materials, so you can find the solution that best suits your project. At HNC Group you get:
Areas of application
Rubber expansion joints are used in a wide range of installations, including:
Why choose a rubber expansion joint?
When installing piping systems, pumps, motors and other process equipment, there is often a need for flexible connections. Rubber expansion joints offer several advantages:
Frequently asked questions about rubber expansion joints
What is a rubber expansion joint?
A rubber expansion joint is a flexible coupling used to absorb vibrations, noise and movements in pipe installations.
When should a rubber expansion joint be used?
A rubber expansion joint should be used when you want to protect installations against stresses, extend their service life and reduce operating noise.
How do I choose the right rubber expansion joint?
The choice depends on the pressure, temperature and medium in your system. Contact HNC Group for advice on the optimum solution.
When designing piping systems, installing pumps, motors and so on, a need for flexible connections may arise.
These connections must be able to absorb pipe expansion, pipe contraction, vibrations from pumps, installation misalignments, pressure surges, reduction of noise transmitted in the pipes and much more.
One solution may be a rubber expansion joint; these rubber expansion joints are available in many variants covering different needs.
There are rubber expansion joints with a focus on high pressure combined with a high temperature.
Or a particular type of rubber may be required because the medium demands it. The bellows of the rubber expansion joint is typically made of EPDM or NBR, but CIIR and PTFE are also available.
The rubber expansion joint is typically fitted with a loose swivel flange drilled to EN1092-1, but can be supplied drilled to all common standards. Flange finishes other than the standard electro-galvanised are possible, e.g. hot-dip galvanised or a version made entirely of stainless steel.
Other variants of rubber expansion joints include models with union connection, union nut connection and types fitted with tie rods to absorb lateral movements without loading the system with reaction forces.
