Patent ID: 7399168
Filing Date: 2008-07-15
Classification: F04B

Abstract:
1. An air driven diaphragm pump comprising a first air chamber housing defining a first air chamber; a second air chamber housing defining a second air chamber; an air valve, the first air chamber and the second air chamber being on opposite sides of the air valve with the air valve therebetween; a first diaphragm; a second diaphragm; a pump chamber housing defining a pump chamber outwardly of the first air chamber housing with the first diaphragm between and closing each of the first air chamber and the pump chamber; a third air chamber housing defining a third air chamber outwardly of the second air chamber housing with the second diaphragm between and closing each of the second air chamber and the third air chamber; a shaft extending through the air valve and being affixed at a first end to the first diaphragm and at a second end to the second diaphragm, the shaft including a passage in communication with the first air chamber and the third air chamber.