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

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
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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