External Gear Pumps

Working Principle

External gear pump uses two external helical gears. In this, one gear is driven by the prime mover and drives another gear. The gears are supported by bearings in both side of the gear shaft. As the gears rotate they separate on the intake side of the pump, creating a void and suction which is filled by fluid. The fluid is carried in the teeth cavity to the discharge side of the pump, where the meshing of the gears displaces the fluid. The mechanical clearances are fixed to suit the liquid viscosity, to keep the slip minimum. As the shafts are supported at both the sides, these pumps are highly suitable for highly viscous fluids like resins, soap stocks etc. besides for normal fuel/lube oil applications. Because of the precise clearances between the gears to suit the application and fluid properties, these pumps are well suited for precise applications. View Catalogue


Typical Pumped Media

Fuel Oil, Lube Oil, paints, varnish, resins, grease, etc.

Typical Applications

Transfer, jacking oil service for rotor lifting, pressurized lubrication.

Typical Industries

Power Generation, Steel, Paint, Chemical, Oil depots.

Maximum performance data

  • Capacity : upto 1700 lpm
  • Diff. Pressure : upto 7 bar
    Special hydraulic pumps are available for pressures upto 250 bar

Maximum Operating parameters

  • Viscosity : upto 30,000 cSt
  • Fluid Temperature : upto 150°C

Material of Construction

  • Casing options : Cast Iron / Cast Steel
  • Gear : Carbon steel / Stainless Steel / Cast Iron
  • Sealing Options : Gland packing / Mechanical seal / Oil seal

Construction Features

  • Jacketing options : Partial / Cover / No jacketing
  • Mounting options : Horizontal Foot / Horizontal Flange
  • Relief valve options : Built-in


Relief valves, base frame, coupling, coupling guard, companion flanges, pressure gauges, electric motor, variable speed drives, etc.
Pump mounted on a base plate with above accessories as a ready to install system can be supplied.

Salient Features

  • Excellent Self Priming
  • Smooth Flow
  • Low Noise & Vibration