Axial Metal Bellows Expansion Joint / Rotating Flange
A rotating flange axial expansion joint is an axial expansion element whose flanges at both ends of the metal bellows turn freely, so bolt holes are easily aligned during installation.
It is used on heating, hot water and steam lines, especially where existing flanges must be matched. The product range includes DN25–DN300 lined and unlined models in the -30 and -60 series.
Main Applications
- Installation on existing flanged lines
- Heating distribution lines
- Hot and high-temperature water lines
- Steam lines
- Booster set headers
- Points to be removed for maintenance
Technical Data
| Type | Axial metal bellows expansion joint, rotating flange |
|---|---|
| Sizes | DN25 – DN300 (product range) |
| Series | -30 and -60; lined and unlined (product name) |
| Bellows | Stainless steel 1.4541 (AISI 321) |
| Pressure class | PN16 standard; PN2.5–PN63 manufactured |
| Flange | Rotating flange; DIN EN 1092-1 PN16 |
| Axial movement | 30 mm (−20 / +10 mm) standard series |
| Operating temperature | −10 … +550 °C (by material) |
| Design basis | EN 14917 and EJMA |
Material Options
| Part | Rotating flange | Fixed flange |
|---|---|---|
| Bellows | Stainless AISI 321 | Stainless AISI 321 |
| Flange | Rotating (floating) | Fixed (welded) |
| Installation | Easy bolt alignment | Flange position fixed |
| Typical use | Matching existing flanges, maintenance points | New line fabrication |
Which material? As the rotating flange is not welded to the bellows end, bolt holes are aligned by turning during installation. The pressure reduction factor (Kp) applies with temperature; values come from the manufacturer sheet.
Advantages
Easy Alignment
- Flange can be rotated
Easy Maintenance
- Quick removal and refitting
Stainless Bellows
- Corrosion resistant
Liner Option
- At high flow velocity
Construction and Design Features
- Stainless metal bellows
- Rotating flange at both ends
- Bellows end rings
- Inner flow liner (depending on model)
Send the size, pressure, temperature and expansion; we will confirm a suitable rotating flange axial joint from stock.
How to Choose?
- Size and flangeMatch DN and mating flange standard.
- PressureCalculate allowable pressure at temperature with Kp.
- Temperature and movementDetermine the axial movement needed.
- Series and linerChoose the -30 / -60 series and liner need.
Complementary Products
Why ORFA?
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