Patent ID: 6916158

Claim:
A piston pump comprising: an inlet manifold having a first face and a second face, and at least one outlet formed in said second face; an exhaust manifold having a first face and a second face, and at least one inlet formed in said outlet manifold first face; a first piston ring having an inlet face and an exhaust face, said piston ring sandwiched between said inlet manifold second face and said exhaust manifold first face, and having at least one radially extending cylinder formed therein, said piston ring having an inlet passageway formed in said piston ring between said inlet face and said cylinder and in fluid communication with said inlet manifold outlet, and said piston ring having an exhaust passageway formed in said piston ring between said cylinder and said exhaust face and in fluid communication with said outlet manifold inlet; a check valve disposed in said inlet passageway; a check valve disposed in said exhaust passageway; and a piston disposed in said cylinder for reciprocating movement, wherein reciprocating movement of said piston allows fluid into said cylinder from said inlet face through said inlet passageway and exhausts fluid out of said cylinder through said exhaust passageway.