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Gear pumps are self-priming positive displacement pumps that produce a non-pulsating flow and require lower NPSH (net positive suction head) to operate. They are ideal for metering applications and for pumping nonabrasive, viscous liquids at high differential pressures.  Liquiflo has extended the useful range of gear pumps into low-viscosity fluids by using a wide variety of non-metallic, self-lubricating components. Liquiflo gear pumps have handled thousands of difficult chemicals and have been successfully applied in many difficult pumping situations, including high-viscosity, high-pressure and high-temperature applications.

Liquiflo gear pumps are a popular alternative to other pumping technologies, such as Diaphragm pumps, Progressive Cavity pumps, Peristaltic pumps and Piston metering pumps.  Gear pumps are an alternative to Diaphragm pumps because they do not pulse or require an expensive air source to operate. For metering applications, they do not require pulsation dampeners or other ancillary equipment. In continuous duty applications, they generally last longer than Diaphragm, Progressive Cavity or Peristaltic pumps, which require frequent part replacement, such as diaphragms, stators, rotors or hoses. Gear pumps have a simple principle of operation which makes them easy to understand and repair.

Liquiflo offers a large selection of standard pumps, kits, parts, options and accessories, which are available for immediate delivery. In addition, Liquiflo can customize pumps to meet your specific needs.

Liquiflo Gear Pump Models

Liquiflo produces six separate series of gear pumps. Each series includes several models to suit your flow rate.


  • 316 ss & Alloy-C Sealed & Mag-Drive; Standard Duty Gear Pump
  • Created to enhance Liquiflo’s initial 3-Series. Featuring comparable external dimensions and capacities, the H-Series integrates larger shafts and bearings, enabling them to manage increased pressures while extending their operational lifespan.
  • Offered in Sealed and Mag-Drive variants, which can achieve flows of up to approximately 55 GPM and differential pressures up to 225 PSI, with certain models capable of reaching 300 PSI.


  • Sealed & Mag-Drive; High Pressure Gear Pump
  • Liquiflo offers its initial 3-Series Gear Pumps in Sealed and Mag Drive variations, supporting flows of around 55 GPM and accommodating differential pressures up to 100 PSI.


  • Sealed & Mag-Drive; High Pressure Gear Pump
  • The Max® Series Gear Pumps incorporate helical gears and relieved wear plates to ensure a smoother and quieter operation, along with an inherent reduction in gear separation forces. The distinctive and robust design of these pumps guarantees an extended lifespan, particularly in high-pressure pumping applications.


  • Mag-Drive; Fluoropolymer-Lined Stainless Steel Gear Pump
  • The Poly-Guard® Series Gear Pumps were specifically crafted to manage highly corrosive chemicals, including inorganic acids, alkalis, and salts. With non-metallic internal components and surfaces, the Poly-Guard pump stands out as an excellent option for applications requiring high purity.


  • Mag-Drive; Low Flow Gear Pump
  • The 4-Series Gear Pumps were created for OEM applications, particularly in chemical feed systems. With a diverse range of materials available, these pumps cater to a wide spectrum of chemical processing needs. A distinctive characteristic of the 4-Series pump is its parallel port connections situated at the front of the pump.


  • Mag-Drive; Ultra Low Flow Gear Pump
  • The 2-Series Gear Pumps were crafted for applications with low flow requirements. Their compact and robust design renders them well-suited for various purposes, such as chemical dosing and metering, pipeline sampling, and wastewater treatment.


  • Available in cast iron or stainless steel, with a choice of rotor and stator materials
  • High pressure / long haul pumping, eliminating the need for a series of pumps when pumping over long distances or with high head requirements
  • Available in standard geometry or extended pitch
  • Gentle pumping action minimizes shear and crush damage
  • Inspection cover available for applications where rag content is a problem
  • The pump can be supplied with a square inlet and conveyor to assist viscous slurries into the pumping element
  • Low running speeds – ideal for abrasive applications

typical applications

  • Domestic and industrial effluents
  • Sludge
  • Milk curds, sauces, fruit juices
  • Industrial chemicals
  • Detergents
  • Coating clays
  • Gypsum and silicate
  • Paper stocks
  • Agriculture slurries
  • Hydrated lime slurry
  • Starch slurries