Self-Priming Air Operated Double Diaphragm Pumps

A diaphragm pump is a type of positive displacement pump which uses a flexible diaphragm as the only moving part to create pressure and move fluid. It is typically used in applications where a low flow rate, high pressure, or a pulsating flow is required. 

A centrifugal pump is a type of rotodynamic pump that uses a rotating impeller to create pressure and move fluid. It is typically used in applications where a high flow rate ir required. 

An air operated double diaphragm pump also known as an AODD pump is a type of positive displacement pump which operates using compressed air instead of an electric motor. It consists of two flexible diaphragms connected by a shaft, which move back and forth to create suction and discharge cycles.

As compressed air enters one chamber, it pushes the diaphragm outward, forcing fluid out of that side whilst simultaneously drawing fluid into the opposite chamber. A set of check valves ensures that liquid flows in only one direction. The air supply then shifts to the other chamber, repeating the cycle and maintaining a steady flow.

AODD pumps offer versatility, as they can handle a wide range of fluids, including abrasive, viscous and corrosive liquids. They are self-priming and can run dry without damage, making them ideal for unpredictable flow conditions. Additionally, they feature a simple design with minimal moving parts, leading to low maintenance and easy repair.

Yes, they can run dry without damage, making them ideal for applications with variable flow or intermittent fluid supply. Unlike centrifugal pumps, which can overheat and fail without liquid, AODD pumps use air pressure to move diaphragms, allowing them to operate safely even when dry. However, while they won’t suffer immediate damage, prolonged dry running can increase diaphragm wear, so regular maintenance checks are recommended.