Fludex Coupling

fludexThe FLUDEX coupling is a fluid coupling on which the coupling parts on the input and output side are not mechanically connected and thus resistant to wear.  FLUDEX couplings limit the starting and the maximum torque in the drive train and serve as starting aid for the motor, as overload protection in case of malfunction, and for torsional vibration separation.  Four series of FLUDEX couplings are offered with various types and sizes designed according to the modular construction system and for power ratings up to 2,500 kW.

Fludex Application Examples

  • Conveying systems (also underground)
  • Centrifuges
  • Mixers
  • Drum drives
  • Crushers
  • Ventilators
  • Pumps
  • Shredders
  • Bucket wheel excavators
  • PTO shaft generators

Fludex Advantages

  • Soft and shockless starting of machines and conveyors
  • Torque limitation during start and overload protects coupled components of a plant
  • Excellent vibration separation and shock damping
  • Torque transmission without wear allows the starting of internal combustion engines with connected loads
  • Little operating slip of the coupling at nominal load
  • Can be used in potentially explosive atmospheres; certified acc. to 94/9/EC (ATEX 95)


Fludex couplings are hydrodynamic fluid couplings which operate on the Fottinger principle.  The coupling parts on the input and output sides are not mechanically connected to each other.  Output is transmitted via the oil filling which rotates in the coupling and is conducted over radially arranged blades.

Fludex couplings limit starting and maximum torque in the drivetrain and, through the property of rotational slip, serve as an aid to starting the motor, as overload protection in the event of fault and for isolating torsional vibration.