A Air Diaphragm Pump diaphragm pump (also referred to as a Membrane pump) is a positive displacement pump that runs on the combination of the reciprocating actions of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm

A dual diaphragm is a positive displacement pump which utilises two flexible diaphragms that reciprocate back and forth, creating a temporary chamber, which both allures and expels fluid through the pump. … Both diaphragms that are linked by a shaft through the center section where in fact the air valve is located.

Though this will depend upon the pump and application, a positive displacement pump, is normally a self-priming pump. … For instance, air managed diaphragm pumps self-prime by creating a pressure differential in the diaphragm chamber. This allures surroundings and pulls the liquid in to the suction port.