Abstract: A method for precision-grinding a bezel at the inlet of a bore of a workpiece, comprising the following steps:a. generating a bezel at the inlet of the bore of the workpiece by grinding the workpiece at the inlet of the bore with a first grinding tool into a first shape defining an angle correspondingly slightly greater than a desired nominal angle;b. honing the bore to generate a honed bore; andc. again grinding the bezel to its nominal shape by means of a second grinding tool, while simultaneously guiding the second grinding tool in the honed bore by means of a pilot.

Abstract: The invention relates to a fuel injection system for internal combustion engines, having a high-pressure feed pump that pumps fuel from a supply tank into a high-pressure common rail that communicates with the various injection valves via high-pressure lines. To increase the injection pressure to up to 2000 bar, the injection valves have a booster piston, which is guided axially on the valve member of the injection valve and with one end face defines an injection pressure chamber that communicates with the injection ports, and with its other end face defines a work chamber that can be made to communicate with the common rail.