How does an air operated double diaphragm pump work?
The Air Operated Double Diaphragm Pump (AODD Pump) is a positive displacement pump that exploits the reciprocating motion of diaphragm and balls. Rubber, thermoplastic, or Teflon diaphragms, as well as other appropriate diaphragms, are utilized in AODD pumps. It consists of two pumping chambers that are filled and expelled alternately using flexible diaphragms. To produce the pumping motion, compressed air is alternately fed into and released from air chambers on opposing sides of the diaphragm.

When the chamber pressure rises due to decreased volume, the diaphragm slides down, forcing the previously drawn fluid out of the chamber of a AODD Pump. Finally, the diaphragm moves up again, drawing fluid into the chamber to complete the cycle. This movement is comparable to that of a cylinder in an internal combustion engine.