Metering and Dosing Progressive Cavity Pumps

Metering Series

Progressive Cavity Metering and Dosing Pumps are ideal for low flow, high accuracy pumping applications. Liberty stocks 3 series of pumps, the ADPL, ANPL and ML series.

These Pumps range in flows from .006 up to 100 GPM and at discharge pressures up to 450 PSI. The most common application for these pump is for polymer feed to treat wastewater, but can also be used in a variety of applications where low flow and high accuracy are required. Contact your Liberty Process Equipment representative today for more information.

All ADPL, ANPL and ML pumps are available in cast iron and more popular stainless steel materials of all wetted parts and are ready to ship same-day from our facility. A wide variety of motors and controls are available for the ADBPL from Liberty Process Equipment to meet your exact control needs and budget.

Liberty Process can offer a drive and control option to meet your needs and budget. From a single fixed spaced motor in AC or DC to a single hand dial to vary the speed to a remote control PLC, Liberty Process Equipment has your low-flow pumping solutions ready to ship same day. Contact us today for a quote and see the difference the ADPL, ANPL and ML pump series can make in your low-flow pumping applications.

Metering and Dosing - Features

  • Low Flow
  • High Accuracy

Metering and Dosing - Technical Data

Flow Rate .006 - 100 GPM
Pressure Up to 450 PSI
Seal Options Standard Mech. Seal / Packing Seal
Base Options Steel Cast or Stainless Steel
Rotors Chrome Plated Stainless Steel & Tool Steel
Stators Buna / Viton® / EPDM

Metering & Dosing - Pump Model Overview


The ADPL and ADBPL Progressive Cavity Metering and Dosing Pump is available in 3 sizes with flows to 0.80GPM and pressure ratings to 175 PSI.

Technical Data

Range 0 - 1.625 GPM
Pressure 0 - 175 PSI

Industry Uses

  • High Accuracy Polymer Feed Pumping
  • Additive Metering in Lubricant Oil Blending Applications
  • Sampling/Dosing Applications


The ANPL and ANBPL Progressive Cavity Metering and Dosing Pump is available in 3 sizes for flows up to 9.5 GPM and pressure ratings to 350 PSI.

Technical Data

Range 0 - 9.5 GPM
Pressure 0 - 350 PSI

Industry Uses

  • Polymer Feed System Applications
  • Chemical Injection System Applications
  • Sewage Treatment Applications
ML Series of Progressive Cavity Metering and Dosing pumps

ML Series

The ML Series of Progressive Cavity Metering and Dosing pumps is available in many sizes depending upon your application needs.

Technical Data

Range 0 - 100 GPM
Pressure 0 - 450 PSI

Industry Uses

  • Industrial Chemical Mixing Applications
  • Wastewater Treatment Polymer Feed Applications
  • Sampling/Dosing Applications

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.