The ARO PD20P-FPS-PAA is a robust 2-inch air-operated double diaphragm pump (AODD) from the ARO Expert Series (Ingersoll Rand brand). It is designed for reliable, leak-free transfer of a wide variety of fluids in industrial, chemical, and water/wastewater applications.
Key Features and Construction
Pump Type: Non-metallic air-operated double diaphragm pump (positive displacement).
Wetted Parts: Polypropylene (body, manifolds, and seats) for excellent chemical resistance and corrosion protection.
Diaphragms and Balls: Santoprene (a thermoplastic elastomer) for both diaphragms and check balls, providing good abrasion resistance, flex life, and compatibility with many mild to moderate chemicals, acids, and slurries.
Hardware: Stainless steel fasteners for added strength and durability.
Porting: 2\" ANSI/DIN hybrid side flange connections (versatile for easy installation into existing piping systems). The unit comes with 2\" Camlocks also.
Center Section and Manifolds: Polypropylene construction with bolted assembly for a leak-free, environmentally sound design that minimizes the risk of cracking.
Performance Specifications
Maximum Flow Rate: Up to 184 GPM (696 LPM) with a flooded inlet.
Maximum Operating Pressure: 120 psi (8.3 bar).
Maximum Air Inlet Pressure: 120 psi (8.3 bar).
Displacement per Cycle: Approximately 5.3 litres at 100 psi.
Maximum Solid Size: 1/4\" (6.4 mm) diameter — handles small solids and slurries effectively.
Maximum Viscosity: Up to 50,000 cPs (depending on configuration).
Temperature Range: Typically 0°C to 79°C.
Air Consumption: Up to approximately 140 SCFM at maximum performance.
Benefits and Applications
This pump excels in self-priming, dry-running capability, and gentle handling of shear-sensitive fluids. Its bolted, ribless design enhances serviceability and reduces maintenance downtime. The polypropylene and Santoprene combination makes it particularly suitable for:
Chemical processing and transfer
Industrial wastewater and water treatment
Pumping corrosive or abrasive fluids
Tank unloading and batch processing
The PD20P-FPS-PAA offers a balance of high flow, chemical compatibility, and reliability in demanding environments where metallic pumps might corrode. It is part of ARO’s Expert Series, known for optimised air valve performance and efficient operation even at lower air pressures.
This unit is fixed to a trolley and was tested with water.
Unit runs well.
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Laverton North, VIC - Delivers Nationally 
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