Genuine Wilden air-operated diaphragm pumps for viscous and thick fluids — positive-displacement action moves what centrifugal pumps can’t. In stock.
| Flow Rate | viscosity-dependent |
|---|---|
| Head | up to 86 m (8.6 bar / 125 psi) |
| Power | air-operated (no motor) |
| Inlet / Outlet Diameter | 1/2-inch–3-inch (13–76 mm) |
| Material | aluminium, stainless steel, cast iron |
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.
Genuine Wilden AODD Diaphragm Pumps & Spare Parts15-1120-51 is a neoprene valve seat for the Wilden T15 — the surface each check ball lands on. Wear here mimics a bad check ball closely.
Genuine Wilden AODD Diaphragm Pumps & Spare Parts15-1010-51 is the primary neoprene diaphragm for Wilden’s 3″ T15 pumps — the part that actually flexes to move fluid on every stroke.
Genuine Wilden AODD Diaphragm Pumps & Spare Parts15-3520-52 is the Buna-N center block gasket on the Wilden T15. Cheap, easy to overlook, and often blamed on other parts when it leaks.
