Patent ID: 6644930
Filing Date: 2003-11-11
Classification: F04B

Abstract:
A method for pumping a material with a first diaphragm pump having an entry chamber that receives a working liquid and a pumping chamber that receives the material to be pumped, where the entry chamber and the pumping chamber are separated by a movable membrane, the method comprising the steps of:increasing a pressure in the entry chamber and the pumping chamber during a filling stage when the pumping chamber is not pumping the material to be pumped by pumping the working liquid into the entry chamber until the pressure in the entry chamber reaches a predetermined pre-pressure that is less than a working pressure of the entry chamber; and after the filling stage, further increasing the pressure in the entry chamber and the pumping chamber to the working pressure during a working stage when the pumping chamber is pumping the material to be pumped from the pumping chamber by pumping the working liquid into the entry chamber.