Patent ID: 7080975

Claim:
A pump apparatus which comprises: a displacement pump having a reciprocatable piston positioned within a first housing having an interior wall spaced apart from said 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 to form a first fluid path, a ceramic rotor having a second fluid path in fluid communication with said fluid outlet, said 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 of a ceramic rotor positioned in contact with said first flat surface of said ceramic stator, a position of said piston and a position of said ceramic rotor being synchronized to effect desired fluid flow through said ceramic stator, and means for periodically washing the interior volume of said first housing, and said first fluid path and said second fluid path, said means including internal seals that are stationary relative to said reciprocating piston.