Gear pumps

Perfect dosing, no pulsation

Gear pumps are reversible positive displacement pumps that can pump low to high viscosity media without hard particles. They are characterized by their precision in dosing and their reliability at low to high pressures. They are also very compact, guarantee a non-pulsating flow rate and are resistant to high temperatures. There are two main types: external and internal gear pumps.

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Specifications

  • Delivery rate 0 to 900,000 l/h
  • Differential pressure up to 250 bar
  • Viscosity range approx. 0.3 to 30,000,000 mPas
  • Self-priming up to 8 mWS
  • Temperatures from -30 to 320 °C

How a gear pump works

Internal gear pumps use two intermeshing gears of different sizes and a crescent-shaped crescent. The larger gear wheel drives the smaller one, creating and enlarging cavities between the teeth. This creates a vacuum that draws in liquid. The liquid is then transported between the teeth and the crescent and pushed towards the outlet as the cavities shrink.

External gear pumps consist of two gears that rotate in a housing. When the gears rotate, a vacuum is created on the inlet side, which draws in liquid. This liquid is transported along the housing wall in the spaces between the teeth. On the outlet side, the teeth mesh and displace the liquid, forcing it out of the pump under pressure.

An externally toothed gear pump

Examples of use

Dosing, conveying, emptying and reversing

Specifications Gear pump, externally toothed

  • Delivery rate 0 to 600 l/h
  • Differential pressure up to 5 bar
  • Viscosity range from approx. 30 to approx. 120 mPas
  • Self-priming up to 4 mWS

Advantages

  • Low pulsation volume flow
  • Large adjustment ranges can be realized
  • Delivery rate adjustable in proportion to the number of drives

Design variants

  • Self-priming internal gear pump
  • Pump available according to ATEX
  • Pump heatable / coolable
  • Pump for minimum flow rate

Nature of pumped media

Abrasive to corrosive media

Typical pumped media and applications

Food
  • Fats
  • Cocoa butter
  • Oil
  • Chocolate
Pharmaceuticals, fine chemicals and cosmetics
  • Biofuel
  • Solvent
  • Synthetic oil
Chemistry and surface technology
  • Diesel
  • Solvent
  • Oily solutions
  • Polyester resin
  • Specialty lubricants
  • Turpentine
Construction and transportation
  • Bitum
  • Tar
  • Oil
Industry
  • Machine oils
  • Mineral oils
  • Engine oils
A gear pump that is internally toothed.

Examples of use

Dosing, conveying, emptying and reversing

Specifications Gear pump internal geared

  • Delivery rate 0 to 93,000 l/h
  • Differential pressure up to 16 bar
  • Viscosity range from approx. 0.3 to approx. 100,000 mPas
  • Self-priming up to 8 mWS
  • Temperature range -60 to 300 °C

Advantages

  • Low pulsation volume flow
  • Large adjustment ranges can be realized
  • Delivery rate adjustable in proportion to the number of drives

Design variants

  • Self-priming internal gear pump
  • Pump available according to ATEX
  • Pump heatable / coolable
  • Pump for minimum flow rate

Nature of pumped media

abrasive to corrosive media

Typical pumped media and applications

Food
  • Fats
  • Cocoa butter
  • Oil
  • Chocolate
Pharmaceuticals, fine chemicals and cosmetics
  • essential oils
  • Perfume
  • Liquid wax
  • synthetic oil
Chemistry and surface technology
  • Diesel
  • Oily solutions
  • Polyester resin
  • Specialty lubricants
  • Turpentine
Construction and transportation
  • Bitum
  • Tar
  • Food viscous
  • Oil
Industry
  • Machine oils
  • Mineral oils
  • Engine oils

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