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Group 20 High-Low Pumps


  • European 4 bolt flange
  • 1:8 tapered shaft
  • Common inlet & outlet
  • Front pump: 10 cc/rev, Rear pump: 18 cc/rev, Rotation: Clockwise from shaft view
  • Unloading valve opening pressure 60-65 bar
  • From 4.5 to 30 cc/rev displacement options
  • First stage nominal pressure 200 bar, nominal speed 1500 rpm

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Many systems require a high volume at low pressure for rapid traverse of a vise or tool, and then low volume, high pressure for clamping or feeding. This can be accomplished by a hi-lo circuit using two pumps. During rapid traverse, both pumps supply the system. When pressure rises during clamping or feed, the large-volume main pump unloads and the small pump maintains pressure. These gear pumps offer the advantage of requiring lower power of the motor.

Hidros offer high-low tandem gear pumps with integrated valves as below:

Applications:

  • Waste compactors
  • Log splitters
  • Clamp mechanisms
  • Crimping machines
  • Metal forming machines etc.
Code Displacement
Front pump
cc/rev
Displacement
Rear pump
cc/rev
Max. pressure
Front pump
bar
Max. pressure
Rear pump
bar
Max. speed
rpm
Rotation from shaft view
H22C5/12X815R 5 12 250 70 3000 Clockwise
H22C3.5/11X815R 3.5 11 250 70 3000 Clockwise
H22C3.5/6.5X815R 3.5 6.5 250 70 3000 Clockwise
H22C4.5/7X815R 4.5 7 250 70 3000 Clockwise
H22C10/18X815R 10 18 200 70 3000 Clockwise
* Unloading valve opens at 70 bar and oil returns to inlet from rear pump. Only front pump provides flow to the system.
Ports are flanged as standard. For BSP threaded ports, ordering code should be 22C…/…X815RG.

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