Fuel pump for a direct injection system

Abstract

A fuel pump for a direct injection system having: a main body; a pumping chamber defined in the main body; a valve, which is configured to adjust the flow of fuel through the pumping chamber and has a valve disc having a series of through holes and a flexible sheet provided with a series of shutting portions, each shaped so as to rest against an outer wall of the valve disc, thus closing the passage through a respective through hole; and a plurality of grooves, each arranged, at least when the valve is closed, in the area of the outer wall of the valve disc and around a respective through hole so as to reduce a contact surface between the outer wall of the valve disc and an inner wall of the corresponding shutting portion.

Dependencies are inferred from the claim text.