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ML Series Progressive Cavity Metering and Dosing Pumps

Pump Series Description

The ML series of Low Flow Progressive Cavity Metering and Dosing Pumps from Liberty Process Equipment offers a high quality pump option for higher pressures at a very competitive price. The ML series is based on the very popular Liberty series of standard flanged progressive cavity pumps. The Pumps are available with standard ANSI suction flanges and with NPT female threaded discharge connections.

The ML series is available in a variety of stage lengths so you can tailor your pump to your exact needs in terms of flow and pressure. The ML series offers a cost effective option and is an ideal pumping solution for metering pump applications and offers several important advantages over other types of metering pumps.

The modular design of the ML Series of Progressive Cavity Metering and Dosing Pump is a hardened pinned-joint drive assembly with a body available in steel or 316 stainless steel and internal wetted components in either stainless steel or hardened tool steel with hard chrome plating for long-life and durability in abrasive pumping applications. Other, non-contacting internal parts are made of carbon steel.

Rotors and Stators for the ML Series are available in 2, 3, and 6 stages representing 150, 225, and 450 PSI discharge pressures with stators available in Buna Nitrile, Viton, EPDM and Natural Rubber. The standard seal design is a set of packing with a lantern ring and flush connectors. Mechanical Seal options are readily available.

Contact a Liberty Process Equipment engineer today with your application information and we'll be glad to see if the ML Series of metering and dosing pumps is the Progressive Cavity Pumping solution you're looking for.

Liberty Series - ML Metering Pumps - Technical Data

Pump Features

Compatible Pumps


2ML1 Metering Pumps

ML Series 2ML1 Metering Pumps The 2ML1 size Progressive Cavity Metering Pump is rated for 0.056 gallons per minute per 100 RPM. Standard connections are 3/4" discharge & 1" suction.

  • RANGE 0 - 0.50 GPM
  • PRESSURE 0 - 120 PSI
  • Polymers & Chemical Mixing Applications
  • Chemical Feed Pumping
  • Sampling/Dosing Applications

3ML1 Metering Pumps

ML Series 3ML1 Metering Pumps The 3ML1 size Progressive Cavity Metering Pump is rated for 0.056 gallons per minute per 100 RPM. Standard connections are 3/4" & 1".

  • RANGE 0 - 0.50 GPM
  • PRESSURE 0 - 180 PSI
  • Polymers & Chemical Mixing Applications
  • Polymer Feed Pumping
  • Sampling/Dosing Applications

6ML1 Metering Pumps

ML Series 6ML1 Metering Pumps The 6ML1 size Progressive Cavity Metering Pump is rated for 0.056 gallons per minute per 100 RPM. Standard connections are 3/4" & 1".

  • RANGE 0 - 0.50 GPM
  • PRESSURE 0 - 360 PSI
  • Polymers & Chemical Mixing Applications
  • Polymer Feed Pumping
  • Sampling/Dosing Applications

6ML2 Metering Pumps

ML Series 6ML2 Metering Pumps The 6ML2 size Progressive Cavity Metering Pump is rated for 0.026 gallons per minute per 100 RPM. Standard connections are 1-1/2" & 3/4".

  • RANGE 0.50 - 3.0 GPM
  • PRESSURE 0 - 360 PSI
  • Industrial Chemical Mixing Applications
  • Wastewater Treatment Polymer Feed Applications
  • Sampling/Dosing Applications

6ML3 Metering Pumps

ML Series 6ML3 Metering Pumps The 6ML3 size Progressive Cavity Metering Pump is rated for .86 gallons per minute per 100 RPM. Standard connections are 2-1/2" & 1-1/4".

  • RANGE 3.0 - 9.0 GPM
  • PRESSURE 0 - 450 PSI
  • Industrial Chemical Mixing Applications
  • Wastewater Treatment Polymer Feed Applications
  • Sampling/Dosing Applications

6ML4 Metering Pumps

ML Series 6ML4 Metering Pumps The 6ML4 size Progressive Cavity Metering Pump is rated for 2.02 gallons per minute per 100 RPM. Standard connections are 2-1/2" & 3".

  • RANGE 9 - 20 GPM
  • PRESSURE 0 - 450 PSI
  • Industrial Chemical Mixing Applications
  • Wastewater Treatment Polymer Feed Applications
  • Sampling/Dosing Applications

2ML8 Metering Pumps

ML Series 2ML8 Metering Pumps The 2ML8 size Progressive Cavity Metering Pump is rated for 11.7 gallons per minute per 100 RPM. Standard connections are 6" & 4".

  • RANGE 25 - 100 GPM
  • PRESSURE 0 - 225 PSI
  • Industrial Chemical Mixing Applications
  • Wastewater Treatment Polymer Feed Applications
  • Sampling/Dosing Applications

*Liberty Process Equipment, Inc. is not affiliated with nor distributor for Seepex®, Allweiler®, Moyno®, Tarby®, Netzsch®, or Continental Inc.® All referenced product names, brands, models, or part numbers is solely for identification purposes. Seepex® is a registered trademark of Seepex®. Moyno® and Tarby® are registered trademarks of Robins and Myers® and NOV®, Netzsch® Incorporated is a registered trademark of the Netzsch® Group, Allweiler® is a registered trademark of Colfax® Corporations Continental® Pumps is a Trademark of Continental® Ultra Pumps.