Gear Pumps


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Product Overview

Gear pumps are designed primarily for metering and transfer applications. Their modular design allows a wide variation of flow ranges with a standard parts set. Gear pumps are self-priming and are “constant flow” pumps when RPM and differential pressure are constant. The materials of construction for bodies, gears and seals, provide a wide range of fluid compatibility.


Flow Rates: Range to 2 liters/min.

Max. Pressure: 30 psi.

Max. Fluid Temperature: Range to 180°F (82°C).

Motors: Thermally protected, continuous duty rated, brush DC motors.

*Please Note: Testing performed in a controlled laboratory environment. Actual performance may vary (+) or (-) 10% from the information shown.

Materials in Contact with Solution
See individual pump series and product charts for details. For alternative material options see the OEM Options section below or consult the factory for assistance.


  • Long life
  • Reversible
  • Pump assemblies made with PPS Polymers
  • Excellent chemical compatibility
  • High pressure
  • Self-priming
  • Compact and durable
  • Positive displacement


OEM Options
GRI specializes in the design and manufacturing of customized pumps for the OEM market. Other gear pumps are available with different flows and pressures. Please contact us to discuss custom OEM options.

Selection Procedure

Determine the flow and discharge head requirements for your system. The performance curves on this page provide the flow rates for each gear pump series. If the performance curve characteristics of a pump model do not meet the exact requirements of your application, please consult the factory.

For proper selection of the materials of construction (pump body, seals, shafts, hose connectors, gears, O-rings) refer to the Chemical Resistance Section.

Mesh Size

Mesh Size Recommendation
A minimum 80 mesh screen is generally recommended for gear pumps for filtering such things as shavings, packaging materials, etc., in systems that are generally free of particulate contamination. For systems where sand, silt or other particle contamination is expected, a 400 mesh minimum screen is recommended. It should also be noted that sufficient strainer area be provided in order to prevent pump starving and cavitation. The fluid flow rate and viscosity determine how much strainer area is needed. System design should always include testing with the inlet strainer blocked and with maximum fluid viscosity.

Pump Series Maximum Flow Rates Maximum Pressure Maximum Fluid Temperature Motor Specs/Voltages
19000 2100mL/min 30 PSI 180°F (82°C) 12 / 24VDC Brush