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DFS type with tie rods
| Item | Designation |
|---|---|
| 1 | Rubber bellows |
| 2 | Flanges |
| 3 | Reinforcement ring |
| 4 | Loose brackets |
| 5 | Tie rods |
| 6 | Nuts |
| 7 | Spherical washers |
DFS Type
expansion joints
Features
- Transportation or piping systems that carry fluids, slurries or gasses under pressure or vacuum at varying temperatures
- Reduction of vibration
- Dampen sound transmission
- Compensate movements due thermal changes, misalignments caused by wear, load stresses, settling of supporting foundations
- Molding and manual production
- Standard measures (length)
Advantages
- Easy installation
- Flanges are not in contact with medium, which enables lower grade material
- Galvanic surfaces / coatings possible
- Gaskets can be eliminated
- Additional movement capabilities
- Special measures (length, diameter, flanges) → custom made
- Different models (hose, reduction, multiple arches, filled arch, spool, …)
- Higher design pressure
- Special designs (spring rates, different inner and outer layers)
Operating range
Diameter: DN 25 ... DN 3000 (1" ... 120")
Pressure as per request
Temperature up to 180 °C (356 °F)
Movements: all directions
Materials
- Bellows: Various elastomers such as EPDM, EPDM Food Grade, Neoprene, Nitrile, Hypalon, Butyl, Viton
- Flanges: carbon steel and stainless steel.
Other materials are available on request.
Standards and approvals
NDT and documentation: Can be provided per customer request e.g. Material Certificates and NDT test reports.
Recommended applications
- Air conditioning, heating and ventilating systems in industrial buildings and vessels
- Central and ancillary power generating stations in industrial buildings, factories, ships and offshore applications
- Sewage disposal and water treatment plant, pumps, etc.
- Process piping in pulp and paper plants
- Piping systems for chilled or hot water
- Cooling systems for power generation
- Feed water and draining lines for water works, sewage, sanitary piping systems etc.
- Oil lines for industrial plants, shipyards, phosphate plants etc.
Product variants
DFS type PTFE liner
High temperatures or chemical attack. Not recommended for negative pressure.
Item Designation
1 Rubber bellows
2 Flanges
3 Reinforcement ring
4 PTFE liner
DFS type spool
Installation with clamping bands. Maximum pressure 1 -2 BarG.
Item Designation
1 Rubber bellows
2 Reinforcement ring
DFS type elbow
With or without arches.
Item Designation
1 Rubber bellows
2 Flanges
DFS type pressure balanced
In line or elbow construction. No transmission of pressure thrust with absorbtion of axial and lateral movements.
Item Designation
1 Rubber bellows
2 Flanges
3 Reinforcement ring
4 Flanges
5 Nuts
6 Rubber bellows
DFS type filled arch
To avoid deposits in the arch area. Reduced movements and higher spring rates. Not recommended in case of negative pressure.
Item Designation
1 Rubber bellows
2 Flanges
3 Reinforcement ring
4 Filler
DFS type rectangular
Only for low pressure.
Item Designation
1 Rubber bellows
2 Flanges
DFS type wall seal
For axial, angular and lateral movements. Pressures up to 2,5 BarG
