Abstract: A fuel injection valve with a valve body (1), whose end oriented toward the combustion chamber is provided with a pressure chamber (26), which is connected to a supply conduit (7). The pressure chamber (26) is defined by a valve member (20) whose valve sealing surface (18) rests against a stationary valve seat (17) with an internal tension and can be lifted up from this valve seat by the pressure in the pressure chamber (26). Downstream of the unblocked opening cross section, there is at least one injection opening (12) into the combustion chamber of the engine. The valve member (20) is embodied as essentially disk-shaped and the valve sealing surface (18) is embodied in its radially outer edge region and can be lifted up from the valve seat (17) in an elastic manner. In its center region, the valve member (20) is prestressed toward its contact with the valve seat (17) by a securing element (22) on the valve body (1) (FIG. 2).

Abstract: Fuel injection nozzle for internal combustion engines includes a nozzle element having a front cusp formed with a conical valve seat face. At least one injection hole is provided in the front cusp. The outer wall area of the front cusp which is disposed opposite to the valve seat face has a lower hardness than that of the inner wall area forming the valve seat face. When the injection hole extends from a pocket hole, preferably the outer wall area of the front cusp encompassing the picket hole has a lower hardness than that of the opposite disposed inner wall area. The intermediary center wall area preferably has a still lower hardness than the outer wall area. Thus, it is achieved that the front cusp of the nozzle element has a higher rigidity than in a known embodiment, without the valve seat face losing any hardness or that the protection of the outer wall area of the front cusp being unduly severly reduced against abrasive wear.