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Group 10 High-Low Pumps


  • European 4 bolt flange
  • 1:8 tapered shaft
  • Common inlet & outlet
  • Front pump: 1.6 cc/rev, Rear pump: 6.9 cc/rev, Rotation: Clockwise from shaft view
  • Unloading valve opening pressure 35 bar
  • From 1.1 to 9.8 cc/rev displacement options
  • First stage nominal pressure 230 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:

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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
H10C1.6X650/6.9X651HL 1.6 6.9 230 35 3500 Clockwise
H10C2.5X650/4.8X651HL 2.5 4.8 230 35 3500 Clockwise
H10C3.2X650/2.5X651HL 3.2 2.5 210 35 3500 Clockwise
H10C4.4X650/8X651HL 4.4 8 210 35 3500 Clockwise
* Unloading valve opens at 35 bar and oil returns to inlet from rear pump. Only front pump provides flow to the system.

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