Axial Metal Bellows Expansion Joint / Fixed Flange
A fixed flange axial expansion joint is a metal bellows element whose stainless bellows absorbs thermal expansion along the pipe axis, connected to the line by fixed flanges at both ends.
It is used on straight sections of hot water, high-temperature water, steam and heating lines. The product range includes PN16 DN25–DN300 models in the -30 and -60 series, lined (L) and unlined.
Main Applications
- Steam and condensate lines
- Hot and high-temperature water lines
- Heating main distribution
- Boiler room headers
- Process heat lines
- Long straight pipe runs
Technical Data
| Type | Axial metal bellows expansion joint, fixed flange |
|---|---|
| Sizes | DN25 – DN300 (product range) |
| Pressure class | PN16 (product name) |
| Series | -30 and -60; lined (L) and unlined (product name) |
| Bellows | Stainless steel 1.4541 (AISI 321) |
| Flange standard | DIN EN 1092-1 PN16 |
| Axial movement | 30 mm (−20 / +10 mm) standard series; other series depending on model |
| Operating temperature | −10 … +550 °C (by material) |
| Design basis | EN 14917 and EJMA |
| Pressure reduction factor | Kp: 0.85 at 100 °C; 0.59 at 550 °C |
Material Options
| Part | −10 … 300 °C | 310 … 500 °C | 510 … 600 °C |
|---|---|---|---|
| Bellows | Stainless steel 1.4541 (AISI 321) | Stainless steel 1.4541 (AISI 321) | Stainless steel 1.4541 (AISI 321) |
| Flange | Carbon steel St 37.2 | Boiler steel P265GH / P355GH | Stainless steel 1.4301 (AISI 304) |
| Inner liner (option) | Stainless steel AISI 321 | Stainless steel AISI 321 | Stainless steel AISI 321 |
| Typical line | Hot water, heating | Steam, high-temperature water | High-temperature process |
Which material? Allowable pressure falls at high temperature (PS ≤ PN × Kp). A lined (L) type should be chosen on lines with high flow velocity. Values come from the metal bellows expansion joint manufacturer sheet.
Advantages
Absorbs Thermal Expansion
- Axial movement
High Temperature
- Up to 550 °C (by material)
Liner Option
- Against flow-induced vibration
Flanged Installation
- Detachable connection
Construction and Design Features
- Multi-ply stainless bellows
- Fixed flanges
- Inner flow liner (L series)
- Shipping and installation rods (depending on model)
Send the size, pressure, temperature and calculated expansion; we will confirm a suitable fixed flange axial expansion joint.
How to Choose?
- Size and connectionChoose DN and fixed flange standard.
- Pressure classCheck allowable pressure with Kp at operating temperature.
- Temperature and expansionCalculate movement from line length and temperature difference.
- Material and linerChoose flange material by temperature and liner by velocity.
Complementary Products
Why ORFA?
Other Metal Bellows Expansion Joints
Decorative Type Pipe Expansion Joint
Decorative type pipe expansion joints absorb thermal expansion while giving a neat look to exposed installations.
Details →
Externally Pressurized Expansion Joints
Externally pressurized expansion joints, where pressure acts on the bellows from outside, absorb long axial movements.
Details →
Limit Rod Expansion Joints
These expansion joints absorb movement between structures in pipelines crossing building expansion joints.
Details →
Omega U-Flex Expansion Joints
Omega U-Flex expansion joints consist of metal hoses and elbows arranged in a U shape to absorb multi-directional movement at building joints.
Details →
Expansion Joint Omega V-Flex
Omega V-Flex expansion joints consist of metal hoses arranged in a V shape to absorb multi-directional movement at building joints.
Details →
Expansion Joints and Seismic Compensators
Expansion joints and seismic compensators protect pipelines during building movement and earthquakes with multi-directional flexibility.
Details →
Axial Metal Bellows Expansion Joint / Rotating Flange
Axial metal bellows expansion joints with rotating flanges absorb thermal expansion and allow easy alignment of bolt holes.
Details →
Axial Metal Bellows Expansion Joint / Welding Neck
Axial metal bellows expansion joints with welding necks are welded directly into the pipeline to absorb axial thermal expansion.
Details →
Vibration Absorber Metal Expansion Joints
Vibration absorber metal expansion joints prevent vibration from pumps, compressors and chillers from passing into the pipeline.
Details →Get a quote for your project
Our sales team will prepare the best solution for your needs.