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Founded on our line of bronze gear pumps, Oberdorfer continues to lead the industry in quality and innovation. 

They are a proven solution for transporting liquids in many industries. In our offer you will find high-class gear pumps adapted to various working conditions and types of media. 

What is a Gear Pump? 

It is a type of positive displacement pump that moves liquid by trapping it between rotating gears and the pump casing. It provides a steady and consistent flow no matter the pressure. This makes it perfect for situations where precision and reliability matter.

The helical gears are cut at an angle to the gear's face. This design allows for more contact between materials. As a result, it provides a better hydraulic range and quieter operation. While some manufacturers offer a few variations, Oberdorfer has a full selection of styles and models which include: 

  • External 
  • Pedestal Mount
  • Clutch Driven 
  • Motor Mount

How Do Gear Pumps Work?

A gear pump works by rotating two gears that suck in liquid and pump it continuously and evenly. Thanks to their simple construction and high reliability, they are ideal for applications requiring precision and repeatability. 

There are two basic designs, internal or external. Internal gear pumps have a gear inside another gear. Both gears rotate in the same direction. The outer gear drives the inner gear, also called the idler gear. External pumps have two gears of the same size. These gears rotate in opposite directions. They push the liquid to either side before coming back together at the output. 

  1. Gear comes out of mesh, creating expanding volume on the inlet side of the pump. Liquid flows into the cavity and is trapped by the rotating gear teeth.

  2. Liquid travels around the interior of the casing in the pockets between the teeth and the casing – it does not pass between the gears.

  3. Finally, the meshing of the gears forces liquid through the outlet port under pressure.


Gear Pumps: Reliable Flow for High-Viscosity and Harsh Fluids 

Gear pumps perform well pumping high viscosity fluids and oils. They also are commonly used to pump harsh liquids as well as resins, chemicals, oils, ink, solvents, food products and more. The rotating gears evacuate any air in the suction line and force the liquid into the pump, enabling self priming capabilities. Gear pumps are able to handle moderate to high pressure, low to high temperatures and a range of flow rates and high capacities due to their overall design. 

 

External Gear Pump - How it works

Discover Our Diverse Models

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Bronze Gear Pumps | Engineered for Extreme Conditions

Oberdorfer bronze gear pumps deliver reliable performance in harsh environments. Ideal for corrosive fluids, high-viscosity liquids, and applications up to 400°F and 100,000 cP. Multiple models available.

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Chemsteel Pumps | Reliable Stainless Steel Gear Pumps

Explore Chemsteel - Stainless Steel Gear Pumps – designed for demanding applications with corrosive, toxic, or high-viscosity fluids.

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Chemsteel - Hastelloy C Gear Pumps

High-performance gear pumps for corrosive fluids. Leak-proof, efficient, and customizable - ideal for demanding industrial environments.

Simplify Your Pump Selection Process

Our Selection Chart makes it easy to compare models. You can check flow rates, pressure levels, and power needs for different conditions. This tool will help you choose the right pump for your needs.

Download Pump Selection Chart
Oberdorfer Pump Selection Chart

All About Gear Pumps

Gear pumps are one of the most popular types of positive displacement pumps. They tend to be compact in size and have minimal moving parts.

They utilize gears, sometimes called rotating cogs, to transfer fluids. The two gears produce a seal and creates suction to the inlet side, fluid is drawn into the pump and then the gears rotate moving the liquid to the outlet port. As the gears rotate they separate on the intake side of the pump, creating a void and suction which is filled by fluid.

There are two basic designs, internal or external. Internal gear pumps are typically designed with a gear within a gear, with both rotating the same way with the outer gear driving the inner (or idler) gear. External gear pumps feature two gears of the same size, rotating opposite of each other pushing the liquid to either side before joining back up at the output.

Gear pumps perform well pumping high viscosity fluids and oils. They also are commonly used to pump harsh liquids as well as resins, chemicals, oils, ink, solvents, food products and more. The rotating gears evacuate any air in the suction line and force the liquid into the pump, enabling self priming capabilities. Gear pumps are able to handle moderate to high pressure, low to high temperatures and a range of flow rates and high capacities due to their overall design.

In many cases, gear pumps are compact in size and economical. Their steady and consistent flow makes gear pumps an ideal solution for applications where accurate dosing, precise volume and high pressure output is important.