Air-Operated Double-Diaphragm Pumps – How They Work

    Trusted for Decades, AODD Pumps Consistently Deliver

    Performing in the most challenging applications, air-operated double-diaphragm (AODD) pumps deliver unique benefits unrivaled by other pump technologies.

    AODD pumps are air- (or natural gas-) operated displacement-type pumps that significantly differ from all other positive-displacement pumps. As a result of air pressure acting on the entire surface of the diaphragm, the diaphragm is in a balanced condition while pumping. This measurably extends diaphragm life over that of mechanically operated diaphragm pumps.

    Because compressed air is limited, the maximum pressure developed by the pump is also safely limited. Thus, AODD pumps are appropriately selected for on-off cycling, on-demand intermittent and up to continuous operating requirements.

    Unique Performance

    Although the AODD pump is a displacement type of pump, it is actually a hybrid and defies strict classification. While its pressure-versus-capacity characteristics resemble those of a centrifugal pump, it is best defined as a sealless, non (or semi) positive-displacement pump.

    Why AODD

    AODD Pump Advantages

    • Runs dry without damaging the pump or system
    • Pumps solids-laden fluids without pump or product damage
    • Self-priming–works in suction lift applications
    • Deadheads safely with no pump or product damage
    • Shear-sensitive–does not shear or separate product being pumped
    • No electricity required–can be fully grounded
    • Low initial purchase price compared to other technologies
    • Submersible–can be submerged completely without safety or performance issues
    • Sealless design–no expensive mechanical seals or packing are required
    • Variable flow and head pressures without sophisticated controls
    • Optional bottom discharge porting depending on fluid characteristics

    How AODD Pumps Work

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    SANDPIPER AODD pumps deliver industry-leading durability and performance. We offer the broadest range of products for a wide variety of applications. Contact a local distributor to find a SANDPIPER pumping solution that’s backed by superior quality and workmanship.

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