Patent ID: 6497373
Filing Date: 2002-12-24
Classification: A61M,B05B,F04B,Y10T

Abstract:
A device for pressurizing fluid, the device having an inlet end and an outlet end, the fluid exiting from the device at the outlet end and moving into a pressure chamber, the device comprising:a hollow piston having a piston axis, said hollow piston providing a path for fluid through the device; a valve member having a valve axis, said valve member configured for axial movement wherein the valve axis remains parallel to the piston axis, said valve member movable between an open position and a closed position; a stop means for limiting axial movement of said valve member, wherein said stop means is coupled to an outlet end of said hollow piston and includes an annular land, wherein a diameter of said annular land is less than a diameter of said hollow piston, and a groove formed between said annular land and the outlet end of said hollow piston, wherein the diameter of said annular land is greater than a diameter of said groove; and a sealing surface for sealing an inlet end of said valve member so that said valve member is sealed when in the closed position, wherein fluid flows through the device into the pressure chamber when said valve member is in the open position, and moving said valve member from the open position to the closed position pressurizes fluid in the pressure chamber.