Positive Displacement Pumps

Practical explanations of gear, diaphragm, and lobe pumps, covering pressure range, viscosity handling, and maintenance.

A process engineer checks a diaphragm pump pressure gauge on a pipe

How to Size a Diaphragm Pump for High Viscosity Liquids

To size a diaphragm pump for viscous fluids, match the required flow and head to the pump's displacement curve, account for viscosity losses, and verify material

Oct 7, 2026 · 6 min read