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Gyrol Fluid drives
Howden Gỳrol® Fluid drives are used to control speed and to absorb shock and torsional vibration and we can offer a wide range of designs that enable our customers to operate rotating equipment with a “soft start” option and at variable speeds with minimal capital cost requirements.

Howden can offer Gỳrol® Fluid Drives in a wide range of classes and sizes with geared options that can operate at speeds above synchronous electric motor speeds.


  • Efficient up to 98% of input speed
  • Reliable
  • Rugged for operation in dirty environments and outdoors
  • Provides infinitely variable speedy control
  • Transmits power smoothly and without shock
  • Available for variable or constant torque applications
  • Turndown ratios 5:1 for variable torque
  • Turndown ratios 4:1 for constant torque
  • Provides no-load setting


  • AKA hydraulic coupling or hydrodynamic drive
  • Power transmitter
  • Variable speed drive
  • Provides a soft start
  • Has no mechanical contact between driver and load

  • Filter Packages
  • Temperature Switches and Gauges
  • Pressure Switches and Gauges
  • Heaters
  • Couplings and Guards
  • Tachometers
  • Sole Plates
  • Pump Bases
  • Vibration Monitoring Equipment


Detailed specifications

Detailed specifications

Class 6    8 Single RA sizes     200-40,000 HP      Up to 3,600 RPM
Class 5    7 sizes                      500-1,400HP         Up to 1,800 RPM
Class 4    7 sizes                      100 - 3,500HP       Up to 1,800 RPM
Class 2    8 sizes                       2 - 2,250 HP         Up to 1,800 RPM


  • Variable and Constant torque applications
  • Pumps Fans & Blowers
  • Compressors
  • Process Equipment
  • Extruders
  • Mixers
  • Crushers
  • Mills
  • Conveyors
Spare Parts

If you require parts or service for a Gýrol product please contact

Paul Booth
Key Account Manager, Gýrol® Fluid Drives
8301 Ronda Dr
Canton, MI 48187
Office: 734.454.5001

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