Abstract: The new valve needle comprises at least one valve-needle section and a valve-closure member section of the valve needle which are manufactured as one part by means of deep-drawing. To guarantee a flowing of the fuel in the direction of the valve seat, two beads are provided, for example, in the valve-needle section, while truncations are formed on the valve-closure member section having a hemispherical bowl shape. Thus, the fuel flows along on the outer periphery of the valve-needle section. The valve needle is especially suited for injection valves in fuel-injection systems of mixture-compressing internal combustion engines with externally supplied ignition.

Abstract: A method for treating valves having a sealing seat embodied on a movable valve element and a valve seat face embodied on a valve seat body in such a way as to improve the surface quality of the sealing faces. The movable valve element is set into a rotational motion, with pressure applied thereto toward the valve seat body held in a fixed position. During the rotational motion of the valve element a vibrational motion of ultrasonic range high frequency, acting parallel to the axis of rotation, is superimposed upon the rotary motion. Simultaneously a fine-grained lapping medium is applied to the valve seat face. The method is suitable for all valves having movable valve elements, the sealing seats of which cooperate with valve seat faces.

Abstract: An apparatus for treating valves having a sealing seat embodied on a movable valve element and a valve seat face embodied on a valve seat body in such a way as to improve the surface quality of the sealing faces. The movable valve element is set into a rotational motion, with pressure applied thereto toward the valve seat body held in a fixed position. During the rotational motion of the valve element a vibrational motion of ultrasonic range high frequency, acting parallel to the axis of rotation, is superimposed upon the rotary motion. Simultaneously a fine-grained lapping medium is applied to the valve seat face. The apparatus is suitable for all valves having movable valve elements, the sealing seats of which cooperate with valve seat faces.