A diaphragm pump (also referred to as a Membrane pump) is a positive displacement pump that runs on the mixture 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 backwards and forwards, creating a temporary chamber, which both draws in and expels liquid through the pump. … The two diaphragms that are connected by a shaft through the center section where the air valve is situated.
Though it depends upon the pump and Air Diaphragm Pump application, a positive displacement pump, is generally a self-priming pump. … For example, air managed diaphragm pumps self-primary by creating a pressure differential in the diaphragm chamber. This allures surroundings and pulls the liquid into the suction port.