High Low Hydraulic Gear Pump

HIGH-LOW TANDEM GEAR PUMPS

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.

Hydropack high-low tandem gear pumps are special pumps with integrated valves as shown in the hydraulic circuit above:

1. First stage high pressure
2. Second stage low pressure
3. Unloading valve

Applications:

• Waste compactors
  
• Log splitters
  
• Clamp mechanisms
  
• Crimping machines
  
• Metal forming machines etc.
  

Specifications:

• European 4 bolt flange
  
• 1:8 tapered shaft
  
• Common inlet & outlet
  
• Front pump: 10 cc/rev, Rear pump: 18 cc/rev, Rotation: Clockwise
  
• 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