Wilden AODD Pumps for Viscous Fluids

Viscosity is where centrifugal pumps quietly give up. As a fluid thickens, the impeller has to spin harder for less and less flow until it’s basically stirring rather than pumping. A diaphragm pump doesn’t work that way — it displaces a fixed volume every stroke, so thick fluid gets moved, not churned.

That makes Wilden pumps a natural fit for syrups, resins, thick sludges, adhesives and heavy oils. You do lose some flow as viscosity climbs — physics is physics — but the pump keeps delivering where a centrifugal would have stalled, and it self-primes to lift the stuff in the first place.

There’s a knack to sizing for viscous duty, so tell us the fluid’s viscosity and its temperature (which changes everything), and we’ll spec a genuine build that actually delivers the flow you need.