AODD Pump

An air‑operated double diaphragm (AODD) pump is a positive displacement pump that uses compressed air to alternately actuate a pair of flexible diaphragms. The diaphragms expand and contract in opposition; as one diaphragm draws liquid into the chamber, the other pushes liquid out. An internal air valve shifts the compressed air from one diaphragm to the other, and check valves prevent backflow, creating a continuous pumping action.

1. How does an AODD pump operate?
An AODD pump uses compressed air to drive two diaphragms that are connected by a common shaft. The air valve alternately directs air to each diaphragm chamber, causing one diaphragm to push liquid out while the other pulls liquid in. This alternating motion produces flow without the need for electrical motors or shaft seals.

2. What makes AODD pumps different from other positive displacement pumps?
Unlike gear or rotary pumps, AODD pumps are powered by compressed air and do not have rotating shafts or mechanical seals in contact with the pumped fluid. This makes them well‑suited for abrasive, viscous, or solid‑laden liquids and allows them to run dry or self‑prime without damage.

3. What are the typical uses for AODD pumps?
They are used in many industries including chemical processing, wastewater treatment, food and beverage production, coatings, and general liquid transfer where electrical power is impractical or hazardous. Their pneumatic operation makes them ideal for explosion‑proof environments and remote locations.