Patent ID: 7717087

Claim:
In a connection point of a bore to a differential pressure chamber of a pressure amplifier, the pressure amplifier having a body with an interior chamber, and a piston within the body, which piston separates the chamber of the body into a work chamber ( 2 ) a compression chamber ( 5 ) and the differential pressure chamber ( 4 ), wherein the differential pressure chamber is subjected to the high pressure of a high-pressure injection system for fuel or relieved of such pressure, and the bore extends through the body, the improvement comprising a cylindrically shaped pocket or an encompassing groove in the differential pressure chamber, the bore discharging into the cylindrical shaped pocket or the encompassing groove thus forming an intersection point, wherein the bore forms a control line that subjects the differential pressure chamber to the high pressure of the fuel system or relieves it of said pressure by connecting it to a valve which thus actuates the pressure amplifier.