By definition, positive-displacement (PD) pumps displace a known quantity of liquid with each revolution of the pumping elements. This is done by trapping liquid between the pumping elements and a stationary casing. Pumping element designs include gears, lobes, rotary pistons, vanes, and screws.

PD pumps are found in a wide range of applications -- chemical-processing; liquid delivery; marine; biotechnology; pharmaceutical; as well as food, dairy, and beverage processing.  Their versatility and popularity is due in part to their relatively compact design, high-viscosity performance, continuous flow regardless of differential pressure, and ability to handle high differential pressure.

Pump School^® is made up of information from a variety of sources including manufacturers, governmental agencies, industry trade organizations, and common PD industry knowledge. 

• Rotary Pump Family Tree
• When to Use a Positive Displacement Pump vs. Centrifugal (pdf)
• Comparing 4 Types of PD Pumps
• Rotary & Centrifugal Pumps
• Pump Sealing Options
• Quick Reference Liquid Guide

 

^©2007, Pump School^®
School Policy
Sponsored by Viking Pump, Inc.