A diaphragm pump (also referred to as a Membrane pump) is a positive displacement pump that runs on the combination of the reciprocating action of a rubber, Air Diaphragm Pump thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm
A double diaphragm is a positive displacement pump which utilises two flexible diaphragms that reciprocate backwards and forwards, creating a short-term chamber, which both allures and expels fluid through the pump. … Both diaphragms that are connected by a shaft through the centre section where in fact the air valve is located.
Though it depends upon the pump and application, a positive displacement pump, is normally a self-priming pump. … For example, air operated diaphragm pumps self-primary by creating a pressure differential in the diaphragm chamber. This allures air and pulls the liquid in to the suction port.