Technical Foundation
What Is a Air Operated Pump?
An AODD pump uses compressed shop air to alternately flex two diaphragms connected by a shared shaft, drawing fluid in through a check valve on one side while discharging it on the other, then reversing. Because the pump has no electrical components, seals, or dynamic packing exposed to the process fluid, it can run dry indefinitely without damage, self-prime from a dry start, and handle abrasive, viscous, or shear-sensitive fluids that would damage a centrifugal or gear pump.
Flow rate is regulated entirely by inlet air pressure and volume rather than motor speed, which makes AODD pumps naturally variable-speed and stall-safe against a closed discharge valve — the pump simply stops cycling under deadhead pressure rather than overheating or over-pressurizing the line. Wetted material selection (polypropylene, PVDF, aluminum, stainless steel, or cast iron for the pump body; PTFE, Santoprene, Buna-N, or Viton for diaphragms and check balls) is the primary spec driver, chosen for chemical compatibility with the specific fluid being handled.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Port Size | 3/8 in to 3 in NPT/flanged | Sets maximum flow rate and determines compatible hose/pipe connections |
| Wetted Material | Polypropylene, PVDF, aluminum, stainless steel, cast iron | Must be chemically compatible with the specific fluid — solvents attack polypropylene, acids attack aluminum |
| Diaphragm Material | PTFE, Santoprene, Buna-N, Viton, Neoprene | Determines chemical, temperature and flex-fatigue resistance over the pump's service life |
| Max Flow Rate | Typically 3-130 GPM by port size | Selected against required transfer time, not just pipe size, since flow drops as discharge head increases |
| Air Consumption | SCFM at rated flow and pressure | Determines compressor sizing needed to run the pump at its rated duty point |
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Applications
Where Air Operated Pumps Get Used
AODD pumps are specified wherever a fluid is abrasive, viscous, shear-sensitive, or the environment rules out electrically powered pumps.
Chemical Processing
Transferring corrosive acids, caustics and solvents using PVDF or polypropylene pumps rated for the specific chemical.
Paint & Coatings Manufacturing
Circulating and transferring high-viscosity paints, inks and coatings without shearing the product.
Wastewater & Sludge Handling
Dry-run-safe pumps moving abrasive slurries and sludge in treatment plants and dewatering operations.
Food & Beverage Processing
Sanitary stainless steel AODD pumps for transferring syrups, sauces and slurries in washdown environments.
Oil & Gas
Explosion-proof air pumps for transferring flammable solvents and fuels in classified hazardous locations.
General Industrial Fluid Transfer
Tote and drum unloading of oils, lubricants and process fluids where electrical pumps are impractical.
Brands
Air Operated Pumps Brands in the Catalogue
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FAQ
Air Operated Pumps Questions, Answered
Why choose an air operated diaphragm pump over an electric centrifugal pump?
AODD pumps can run dry without damage, self-prime, handle abrasive or high-viscosity fluids, and stall safely against a closed valve instead of overheating — none of which a centrifugal pump can do. They're also intrinsically safer in flammable-atmosphere applications since there's no electrical motor or sparking risk at the pump itself, only the compressed air supply to manage.
How do I size an AODD pump for my application?
Start with the required flow rate at your actual discharge head (total dynamic head, not just port size), since flow drops significantly as head increases — manufacturer curves show flow vs. discharge pressure at a given air inlet pressure. Then confirm wetted material and diaphragm compatibility with the specific fluid, and check that your compressed air supply can deliver the pump's rated SCFM continuously.
What wetted materials should I use for solvent transfer?
PVDF or stainless steel pump bodies with PTFE diaphragms are the standard choice for aggressive solvents, since PTFE has the broadest chemical resistance of common diaphragm materials and won't swell or degrade. Polypropylene bodies work for milder solvents but should be checked against a chemical compatibility chart first, as many solvents attack polypropylene.
Can an AODD pump run continuously, or is it intended for intermittent duty?
AODD pumps are rated for continuous duty and are commonly used in 24/7 transfer applications — the main wear items (diaphragms, check balls/seats, air valve) are designed for scheduled replacement rather than continuous-duty limits like an electric motor would have. Diaphragm life depends heavily on fluid compatibility and cycle rate.
What causes an AODD pump to stall or lose flow?
The most common causes are insufficient air supply (either pressure or volume/SCFM), a worn or ruptured diaphragm allowing air to bypass into the fluid chamber, or debris lodged in a check ball/seat preventing proper sealing. A pump that's stalled against a closed valve is functioning as designed and will resume pumping once the valve reopens.
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