High Pressure, Low Ripple, Quiet Operation

The IMO Crescent Internal Gear (CIG) family is a rugged, high-pressure internal gear pump line built mainly for fluid power applications and aircraft fuel test stands. A hydrodynamic fluid film separates all moving contact areas, so the shaft and ring gear effectively float on the pumped fluid, and a patented gear tooth profile minimises trapped fluid and contact stress. The result is a very quiet, low-pulsation pump with long life and low sensitivity to contamination.

Key Data

  • Single pump flows from 1 to 125 GPM (4 to 475 L/min)
  • Continuous pressure ratings to 5,000 PSI (345 bar)
  • Handles fluids down to 0.5 cSt viscosity
  • Speeds to 4,500 rpm, depending on frame size, inlet pressure and viscosity
  • Pressure ripple typically below 1% and noise typically below 68 dB(A)

Configurations

  • 54 single pump models and over 1,300 double pump combinations
  • Double pumps share one inlet with two independent discharges for multiple machine functions
  • Multi-stage arrangements for very high pressure, or high pressure on very low viscosity fuels

Suited for: hydraulic power units, fatigue test equipment, marine hydraulics, liquid fuel injection and fuel component test equipment.