Reliable Diaphragm Pump Solutions for Industry

A diaphragm pump is a positive-displacement pump using flexible diaphragms to transfer fluids safely. Its sealless design removes mechanical seals, which are common potential leakage points.

ARO air-operated models handle clean, abrasive, corrosive, and medium-viscosity fluids across industrial processes. Depending on pump size, standard ARO models pass solids from 1.6 to 9.5 mm (0.06 to 0.375 inches).

ARO pneumatic diaphragm pumps also run dry without damage and self-prime effectively. With water, selected models achieve self-priming lifts reaching 8.3 m (27.2 feet).

ARO air-operated double diaphragm pumps support chemical processing, manufacturing, mining, construction, and wastewater treatment. They also serve food, beverage, pharmaceutical, printing, marine, automotive, ceramic, and energy applications.

Typical duties include fluid transfer, filling, dispensing, circulation, formulation, cleaning, and filter-press feeding. Available specialty pumps address powders, sanitary processing, dewatering, drums, and high-pressure applications.

ARO AODD pumps are particularly suitable where fluid properties or operating conditions frequently change. Their available metallic materials include aluminum, cast iron, stainless steel, and Hastelloy. Non-metallic alternatives include polypropylene, conductive polypropylene, PVDF, conductive PVDF, and groundable acetal.

ARO pneumatic pumps adjust flow by regulating inlet air or the fluid outlet. Available flow spans approximately 1 L/min to 1,079 L/min (0.3 to 285 gpm). Selected standard models can deliver fluid pressures reaching 8.6 bar (125 psi).

When discharge closes, the pneumatic pump stops without consuming energy or overheating. Reopening the fluid circuit lets the pump restart without requiring a bypass.

EXP electronic-interface models support cycle sensing, solenoid control, and diaphragm leak detection. These capabilities support controlled dosing, cycle monitoring, preventative maintenance, and rough flow indication.

Compressed air alternately moves two flexible diaphragms, creating suction and discharge strokes. Check valves control fluid direction through the inlet and outlet chambers. ARO’s unbalanced air valve supports reliable starting and stall-resistant operation under low pressure.

Pneumatic ARO pumps can run dry without damage during empty-container or interrupted-supply conditions. They also tolerate unlimited starts, stops, speed changes, and inversions without overheating.

Most ARO diaphragm pumps carry ATEX certification for potentially explosive gas and dust environments. You can verify the exact certification against each selected model and configuration.

ARO electric diaphragm pumps use an electric motor instead of compressed-air power. EVO Series™ 200 uses a double-diaphragm design with a standard drive mechanism. Its 1.5 kW (2 HP) motor supports small-batch and dosing applications. 

The EVO Series™ 200 reaches 13.1 bar (190 psi) on specified configurations. Performance curves reach 155 L/min (41 gpm), depending on configuration and conditions. Those curves are based on ambient-temperature water using the specified 1.5 kW (2 HP) motor. 

EVO Series™ 300 uses three chambers for smoother flow, low noise and very low pulsation. Its design removes the need for an additional pulsation dampener in documented applications. Available models reach 204 L/min (54 gpm) or 530 L/min (140 gpm). 

EVO Series™ 300 accepts VFD control for adjusting pump speed, flow, and pressure. Commanded motor frequency controls flow, while torque limitation controls maximum pump pressure.