Patent ID: 6267568
Filing Date: 2001-07-31
Classification: F04B

Abstract:
A diaphragm pump, comprising:a body, having a first cavity and a second cavity;a control piston, having a first part in the first cavity, and a second part in the second cavity;said control piston containing a diaphragm being integral with the first of the two piston parts;two seals positioned between the body and the piston, one seal being integral with the first piston part and the other being integral with the second piston part;the positioning of the first part of the piston within said first cavity providing a first chamber in two isobaric parts and an access chamber;the positioning of the second part of the piston within said second cavity providing a second chamber, wherein the second chamber is smaller than the first chamber;two communication channels, the first communication channel connected to the first chamber, and the second communication channel connected to the second chamber, wherein the piston drive stroke is powered by connecting both communication channels to a source of positive pressure whereas the piston return stroke is powered by reducing the pressure provided to the communication channel connected to the first chamber; andtwo suction/delivery orifices providing access to said access chamber.