Patent ID: 6962487
Filing Date: 2005-11-08
Classification: F04B

Abstract:
1. A fluid driven pump comprising: a housing assembly; a first diaphragm supported in said housing assembly and defining a first pumping chamber and a first fluidtight expansion chamber within said housing assembly; a second diaphragm supported in said housing assembly opposite said first diaphragm and coupled thereto, said second diaphragm defining a second pumping chamber and a second fluidtight expansion chamber within said housing assembly; a first exhaust valve movably supported in a first exhaust valve cavity in fluid communication with said first expansion chamber and an exhaust port in said housing assembly; a second exhaust valve movably supported in a second exhaust valve cavity in fluid communication with said second expansion chamber and said exhaust port; a flow control system supported by said housing assembly and couplable to a source of pressurized fluid for controlling flow of pressurized fluid into and out of said first and second expansion chambers such that pressurized fluid entering said first expansion chamber flows through a first expansion chamber flow passage in said housing assembly independent from a first exhaust passage connecting said first exhaust valve cavity to said first expansion chamber and such that pressurized fluid entering said second expansion chamber flows through a second expansion chamber flow passage in said housing assembly independent from a second exhaust passage connecting said second exhaust valve cavity to said second expansion chamber.