3ML1 Progressive Cavity Metering and Dosing Pump

The Liberty Process 3ML1 Progressive Cavity Metering and Dosing Pump is a low-flow Progressive Cavity Pump for metering chemicals and polymers in a variety of industries. The 3ML1 is a 2 Stage Pump for pressures up to 180 PSI. Offered with a 1" standard flanged suction and 3/4" NPTF discharge connection and is available in both cast iron and stainless steel.

The pump units modular design with simple pinned joint drive assembly makes it an ideal cost-effective choice for all of your low-flow applications. Rotors are typically hardened tool steel or stainless steel with a hard chrome plating specification. All other wetted parts are either carbon steel or stainless steel. Stators are available in many elastomer materials such as buna, natural rubber, epdm and viton.

The standard seal design is a set of gland packing with a Lantern Ring and flush connections; Mechanical seal options are readily available. The Liberty unit is a low-cost, maintenance free, dependable drop-in replacement low-flow progressive cavity pump.

3ML1 - Technical Data

Flow Rate 0 - 0.58 GPM
Pressure 0 - 180 PSI
Seal Options Packing or Mechanical Seal
Base Options Steel and Stainless Steel
INLET / OUTLET 1" / 3/4"
Rotors Stainless Steel, Chrome Plated Tool Steel
Stators Buna / Viton® / EPDM / Natural Rubber
Motor Options 1/4, 1/2 HP

Pump Features

  • Modular Design
  • Maintenance Free
  • Easy Assembly/Disassembly
  • Simple Pin-Joint Design
  • Low Shear
  • Non-Pulsating


Pumps and pump parts offered for sale by Liberty Process Equipment, Inc. are made in the United States, Germany, India, Spain, Argentina and Brazil.

*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.