Air-Operated Diaphragm Pumps

Air-Operated Diaphragm Pumps

Air-operated diaphragm (AOD) pumps are one of the most widely used types of positive-displacement pumps, commonly found in chemical processing, beverage production, and wider manufacturing environments.

Trebles stocks a comprehensive range of AOD pumps designed for demanding applications, including biotechnology and pharmaceutical use, where chemical compatibility, reliability, and controlled fluid handling are essential.

Suction cycle
One diaphragm is pulled back from the pump housing, creating a vacuum that draws liquid into the chamber.

Discharge cycle
At the same time, the opposing diaphragm is driven forward by compressed air, pushing the liquid out through the discharge port.

This alternating action creates a continuous pumping cycle. Because air pressure on the back of the discharge diaphragm balances the liquid pressure, the pump can safely operate against a closed discharge valve without damaging the diaphragms or reducing service life.

Trebles supplies a wide range of AOD pumps from leading manufacturers, including Tapflo, suitable for applications involving aggressive, abrasive, or viscous fluids.

Common applications include paints, adhesives, oils, ceramics, and hazardous chemicals, with models available to suit different materials, flow rates, and installation requirements.

Due to their durability and serviceability, Trebles also holds extensive stocks of spare parts and accessories to support ongoing maintenance and reduce downtime.