Air-operate double diaphragm pumps are a well-established positive displacement pump technology. They are used for a broad spectrum of applications from chemical maintenance in swimming pools, to slurry transfer in the manufacture of dog food. With few moving parts, a key benefit of AODD technology is that the diaphragm is the only moving part that makes contact with the media.
AODD pumps require a compressed air supply to drive them. Adjacent liquid chambers are alternately filled and emptied by fluid that is drawn through a common inlet and discharged through a single outlet. The diaphragm for each chamber is connected by a single shaft allowing them to move in unison. An air valve directs pressurized air to the back of one of the diaphragms, which begins a suction stroke for the adjacent diaphragm. This works to create a vacuum and atmospheric pressure forces liquid from one diaphragm to the other past the inlet ball valve.
Once one of the diaphragms reaches the limit of its discharge stroke, the air valve redirects pressurized air to the back of the adjacent diaphragm. Hydraulic forces developed inside of the diaphragm forces the inlet ball onto its seat, and the discharge ball off its seat. This condition allows fluid to flow through the pump discharge. This same process occurs in the opposite chamber, constituting a full cycle. The pump runs continuously until the air supply is interrupted, or discharge pressure rises to become equal that of the inlet pressure.
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