D Type
expansion joints

D Type <br/>expansion joints
D Type expansion joint

Item Description
1 Rubber bellows
2 Flanges
3 Reinforcement ring
4 Loose bracket
5 Tie rods
6 Nuts
7 Spherical washers

D Type
expansion joints


  • 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 production with long radius arch
  • Standard measures (length)


  • Easy installation, flanges can be rotated
  • For installation with “torsional misalignments”
  • Flanges are not in contact with medium, which enables lower grade material
  • Galvanic surfaces/ coatings possible
  • Gaskets can be eliminated
  • Additional movement capabilities
  • Self cleaning arch (no need filler material)
  • Economic

Operating range

Diameter: DN 25 ... DN 750 (1" ... 30"),
Pressure up to 16 bar (232 PSI)
Temperature up to 110 °C (230 °F)
Movements: all directions


  • Bellows: Various elastomers such as EPDM, EPDM Food Grade, Neoprene, Nitrile, Hypalon, 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.

Product variants

D type double arch

Higher maximum movements, lower spring rates.
D type PTFE liner

High temperatures or chemical attack. Not recommended for negative pressure.