![]() The shaft moves to the left, and the movement of the diaphragms increases the volume of pumping chamber B and, at the same time, reduces the volume of pumping chamber A (Figure 1a). The compressed air control system directs air to air chamber A. Figure 1 shows a complete cycle of an AODD pump: Although diaphragm pumps can be driven directly, with the shaft connected directly to a motor, an AODD pump uses compressed air with a sophisticated distribution system directing the air alternately to two air chambers on the opposite sides of the diaphragms. How does an AODD pump work?Īn AODD pump moves fluid by the alternate and repeated back-and-forth movement (strokes) of two flexible membranes or diaphragms mounted on a common shaft (Figure 1). ![]() ![]() Although they are robust, reliable and easy to maintain they can be noisy, prone to icing, and are limited to low pressure applications. Compressed air is alternately fed to, and vented from, air chambers on the opposite sides of the diaphragms to create the pumping action.ĪODD pumps are generally used for transfer applications and can handle a wide variety of feeds including sludges, slurries, abrasive and shear sensitive fluids. ![]() It consists of two pumping chambers that are alternately filled and discharged by the movement of flexible diaphragms. Useful Information on Air-Operated Double-Diaphragm Pumps What is an Air-Operated Double-Diaphragm pump?Īn Air-Operated Double-Diaphragm pump (AODD) is a type of positive displacement (PD) pump.
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