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Guide to Gear Pumps
An Introduction to Gear Pumps

Gear Pump Basics (pdf)

Metering with Gear Pumps (pdf)

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Special Requirements?
Liquiflo can custom engineer pumps to meet the specific requirements of your application





The Liquiflo MAX® Series Gear Pumps will handle differential pressures up to 350 PSI and flows to 20 GPM. Their unique, durable design assures extended life even in high-pressure pumping applications where other gear pumps could fail. The MAX® Series pumps feature newly designed Helical Gears for smoother and quieter operation.
Heavy-Duty Construction
The MAX® Series heavy duty shaft and bearing design make it last even when operating at high differential pressures for extended lengths of time. Its solid construction and oversized heavy duty bolts will minimize pump distortion caused by piping misalignment. The pump mounting bracket is made of corrosion-resistant 316 Stainless Steel or sturdy Cast Iron.
The MAX® Series pumps are available in either Single or Double Mechanical Seal or Mag-Drive configurations. The universal seal housing will accommodate either a single or double mechanical seal. The Close-Coupled design eliminates difficulties and inconveniences of manually aligning the pump and motor. MAX® Series pumps are offered in 316 Stainless Steel or Titanium housings with a selection of internal component materials to optimize your selection for specific applications.
Models M0-M4 Sealed
Models M0-M8 Mag-Drive
& Models M5-M8 Sealed

Max-Series Specifications Click any Model # below to access page for that individual
  MAX-SERIES MODEL   M0 M1 M2 M3 M4 M5 M6 M8  
  Port Connections:
 ANSI 150# RF FLG*









  Max Flow Rate
0.4 1.0 2.5 3.5 5.2 8.8 12.2 15.5 20
  Max Differential
350 350 350 350 350 350 350 350 350
  Max Discharge
500 500 500 500 500 500 500
  Max Temperature
500 500 500 500 500 500 500 500 500
  Max Speed
1800 1800 1800 1800 1800 1800 1800 1800 1800
  NPSHR @ Max Speed
3 3 2 2 5 5 5 4 3
  Weight (without motor)
 Sealed, Close-Coupled
 Mag, Close-Coupled

32 38

32.5 38.5






55.5 55.5

* ANSI 300# RF Flanges are optional.
** For flanged ports, pressure derating is required based on flange type and temperature.
Available Materials Of Construction  
Available Sealing Configurations  
Thumbnail image Magnetically Coupled (sealless)

The magnetically coupled or mag-drive pump is the best method for handling toxic, noxious, crystallizing, or most other hazardous liquids since it completely contains the pumpage by isolating the drive shaft inside the pump housing. With no dynamic seal to leak or replace, the maintenance issues associated with seal leakage are eliminated. All Liquiflo gear pumps are available with magnetic drive.
Mechanical Seal

Mechanical seals are offered in single and double configurations and are used for chemical applications where leakage needs to be minimized or eliminated. The single internal mechanical seal is the most common seal type and is ideal for pumping clean liquids up to 5,000 cP viscosity. The double mechanical seal requires a flushing system and is typically used when pumping liquids that are viscous, abrasive, crystalize on contact with air or are very hazardous. Carbon vs. SiC seal faces are the primary choice for most applications up to 500 °F. SiC vs. SiC seal faces have high abrasion resistance and can be applied up to 500 °F.
Available Options & Accessories  
Repair Kits
Repair Kits simplify inventory and speed repair. All parts can also be purchased separately. (See also Replacement Cartridge for even quicker repairs.)

Relief Valves
Positive displacement pumps should be installed with a relief valve in the discharge line to protect the pump and piping against any type of line blockage including the inadvertent closing of an isolation valve. Liquiflo manufactures two sizes of relief valves in both 316 SS and Alloy-C.
Clamp-On Temperature Control Jacket
Temperature Control Jackets can maintain the pump at either elevated or reduced temperatures. They are commonly used when pumping liquids that solidify or become difficult to pump when the temperature decreases.
Raised-Face Flanges
ANSI, DIN, and JIS Flanges are available to simplify piping connections and disconnections.
Base Plate Mounting
Liquiflo gear pumps are available with base-mounts to simplify installation. Liquiflo also offers base-mounts with or without the motor pre-installed.

Hard-Coated Shafts
Hard-coated shafts are used to extend pump life in difficult applications requiring higher levels of wear resistance. Ceramic Chrome Oxide (CO), Tungsten Carbide (TC) and Titanium Oxide (TO) coatings are available.
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