Gear Pumps
Gear pumps are self-priming, positive displacement pumps that use rotating gears to create suction, draw in fluid, and move it through the pump to discharge on the other side. Because they produce a smooth, non-pulsating flow and require low NPSH (Net Positive Suction Head) to operate, industrial gear pumps are a trusted choice for precise metering applications and for transferring non-abrasive, viscous and non-viscous liquids at high differential pressures. EBARA HG offers two primary types of gear pumps — external gear pumps and internal gear pumps. Each pump suits different flow, pressure, and chemical-compatibility requirements.
There are two types of gear pumps:
- External gear pumps - use two external meshing gears to pull fluid in and push fluid out creating a smooth, continuous flow, ideal for high-pressure, metering-grade applications
- Internal gear pumps - use a small internal gear rotating inside a larger external gear to draw in fluid and then push it out, creating a smooth, pulseless flow, ideal for higher-viscosity fluids and gentle product handling.
We are a proud distributor of gear pumps in Canada.
We are a proud distributor of gear pumps in Canada only.
Types of Gear Pumps
Gear Pump Applications & Industries We Serve
EBARA HG's gear pumps are engineered for demanding process environments where consistent flow and chemical compatibility are critical. Common gear pump applications include:
- Acids and caustics — precise, low-shear metering and transfer
- Polymers — handling high-viscosity, non-abrasive fluids at high differential pressure
- General industrial and chemical processing — reliable metering for process-critical fluid transfer
Not sure which gear pump fits your process? Contact an expert to size and select the right solution for your application.
Choosing the right gear pump depends on your fluid properties, pressure requirements, and process conditions. EBARA HG's sales and engineering team can help you size and select the ideal external or internal gear pump for your application. Request a quote today, or contact aan EBARA HG expert to discuss your gear pump needs.
Frequently Asked Questions
What is a gear pump used for?
Gear pumps are positive displacement pumps used for precise metering and transferring non-abrasive, viscous or non-viscous liquids at high differential pressures. They're commonly used to handle acids, caustics, and polymers in chemical and industrial processes requiring a smooth, non-pulsating, self-priming flow.
What is the difference between an internal and external gear pump?
External gear pumps use two identical external gears that mesh, making them ideal for high-pressure metering. Internal gear pumps use one internal and one external gear of different sizes, offering gentler handling for higher-viscosity fluids. Both are positive displacement pumps suited to different flow and pressure needs.
What are the main applications of gear pumps?
Gear pumps are primarily used for metering applications and transferring non-abrasive liquids at high differential pressures. Typical uses include pumping acids, caustics, and polymers in chemical processing, where consistent, non-pulsating flow and low NPSH requirements are essential for process reliability.
How does a gear pump compare to a centrifugal pump?
Gear pumps are positive displacement pumps that deliver consistent flow regardless of pressure changes—ideal for precise metering and viscous fluids. Centrifugal pumps use rotational energy and are better suited to high-flow, lower-viscosity applications. Gear pumps also typically require lower NPSH to operate efficiently.
What sizes do EBARA HG IG Series internal gear pumps come in?
The IG12 series offers 11 sizes with flows up to 500 GPM and pressures up to 200 PSI, while the IG19 series offers 7 sizes with flows up to 75 GPM and pressures up to 250 PSI. Both feature cast iron construction with NPT or flanged ports.
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