Internal combustion engine high-pressure fuel delivery valve

The present invention relates to a delivery valve of an internal combustion engine, e.g. diesel engine, high-pressure fuel pump The valve () has a ball shutter () normally pushed by a helical compression spring () to close a delivery conduit () of the pump (). A first end () of the spring () rests against a shoulder () of a fastening member () fitted in fluidtight manner to the pump (); a second end () of the spring () acts directly on the ball (); the fastening member () has a pin () coaxial with the conduit () and of such a length as to limit the travel of the ball () to a predetermined value; and the second end () of the spring () has at least one small-diameter turn () by which to engage the ball ().