Internal Gear Pumps

Working Principle

TUSHACO IG series employs proven Internal Gearing (Gear within Gear) principle for pumping. The main gear is keyed to the drive shaft, and rotates concentric in the pump casing. Idler is located on an eccentric pin on the front cover to rotate freely and meshes with main gear when assembled. A crescent shaped partition precision machined on the front cover maintains a small, but positive clearance to achieve perfect sealing between parts. As the gears come out of mesh, a partial vacuum is created, forcing the fluid to rush into the pump casing and fill in the voids between the teeth. Both gears rotating in the same direction of rotation gently transfer the fluid to the delivery port. The resulting action is a smooth-steady flow; low in pulsation, noise and vibration.

Single shaft design well supported on outboard bearing (except for one inside sleeve bearing) enables to pump products even with poor lubricating value unlike in the external gear pumps. External bearing construction offers easy access the pump components i.e., rotor set and even pump casing simply by removing the front cover without disturbing drive parts, bearings etc., and in place. Block pump mounted integrally on hollow shaft gearbox automatically reduces the speed (in several ratios) and enables even the pump rotor to be pulled out without disturbing the drive! It is easily possible to jacket front and rear covers for product heating - thus making the design unique and versatile - ideally suited for process pumping. View Catalogue


Typical Pumped Media

Food and beverage products like Butter, Chewing Gum, Chocolate, Fats, Fruit Juices, Honey, Ice Cream, Molasses, Sauce, Yeast, Syrup, etc.
Soap, Shampoo, etc.

Typical Applications

Forwarding and transfer.

Typical Industries

Food & Beverages, Drugs & pharmaceutical, Chemical Industry.

Maximum performance data

  • Capacity : upto 800 lpm
  • Diff. Pressure : upto 15 bar

Maximum Operating parameters

  • Viscosity : upto 1,00,000 cSt
  • Fluid Temperature : upto 200 °C

Material of Construction

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

Construction Features

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


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

  • Smooth quite flow
  • Reversibility
  • Excellent self priming
  • Bracket/ Gear box mounting allows free expansion/ contraction - alignment not affected
  • Insensitive to viscosities
  • Easy maintenance
  • All metal construction, no contamination
  • Built-in reducer offers ideal speed range 240~960 RPM
  • Single sealing, external bearing
  • Slow speeds ensure better pumping & longer life
  • Low noise and pulsation
  • Reduced maintenance