Patent ID: 6808370
Filing Date: 2004-10-26
Classification: F04F,F16K,Y10T

Abstract:
A gas pressure driven fluid pump, said pump comprising:a pump tank having a liquid inlet and a liquid outlet; a float carried within the interior of said pump tank, said float being operable to move between a low level position and a high level position; a snap-acting valve operatively connected to said float, said valve having a rotatable port member that moves so as to switch to exhaust porting when said float reaches said low level position and to switch to motive porting when said float reaches said high level position; and whereby fluid filling said pump tank causes said float to rise from said low level position to said high level position during said exhaust porting and fluid exiting said pump tank causes said float to fall from said high level position to said low level position due to introduction of motive gas during said motive porting.