Patent ID: 7217105

Claim:
A pump apparatus which comprises: a first displacement pump having a first reciprocatable piston positioned within a first housing having an interior wall spaced apart from said first piston, an interior volume of said first housing being in fluid communication with a fluid inlet to a ceramic stator and a fluid outlet from said ceramic stator, a ceramic rotor and said ceramic stator being positioned in a second housing, said ceramic stator having a first flat surface in sealing relationship with a second flat surface a of a ceramic rotor positioned in contact with said first flat surface of said ceramic stator, said ceramic rotor having a fluid passageway that controls a direction of fluid flow through said ceramic stator, a position of said first piston and a position of said ceramic rotor being synchronized to effect desired fluid flow through said ceramic stator. a reciprocatable second piston positioned within a third housing a second displacement pump for pumping a fluid having a reciprocatable second piston positioned within a third housing having an interior wall spaced apart from a second piston, an interior volume of said third housing being in fluid communication with a fluid inlet to a first check valve and a fluid outlet from a second check valve, said first check valve being in fluid communication with a point of use for said fluid, said second check valve being in fluid communication with a source of said fluid, said first check valve being open and said second check valve being closed when said piston moves toward said first check valve, said first check valve being closed and said second check valve being open when said piston moves away from said first check valve, each of said first piston and said second piston being movable by a common power source, and wherein a fluid pumped from said second displacement pump is directed to a seal of said first displacement pump, said seal positioned to prevent fluid in said first housing from bypassing said first reciprocatable piston.