An Air-Operated Double-Diaphragm pump (AODD) is a type of positive displacement (PD) pump. It consists of two pumping chambers that are alternately filled and discharged by the movement of flexible diaphragms. Compressed air is fed to and vented from air chambers on the opposite sides of the diaphragms to create the pumping action. AODD pumps are generally used for transfer applications and can handle various feeds, including sludges, slurries, abrasive and shear sensitive fluids. Although they are robust, reliable, and easy to maintain, they can be a little noisy and are limited to medium pressure applications.
The compressed air forced the 1st side of the flexible diaphragm to move froth, squeezing the liquid on another side of the diaphragm to take the chamber’s outward path through NRV.
Once this action is completed, the air pressure shifts to the 2nd flexible diaphragm chamber. When the other diaphragm moves forth, it pulls the first diaphragm backward through the linkage rod.
The 1st diaphragm back creates suction in the 1st chamber due to suction/ Vacuum, and the liquid enters the first chamber.
Repetition of the same process follows. i.e., Suction in 1st chamber, discharge of 2nd chamber. Suction in 2nd chamber and discharge of 1st chamber.
Air operated double diaphragm pump is a positive displacement pump and have some compatibility or guidelines of usage.
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