Ventilnadel

摘要

In prior art fuel-injection valves, fuel filters are inserted into the fuel-inlet pipe where they are secured in place. These fuel filters ensure that certain constituants which could, by virtue of their particle size, block or damage the valve are filtered out of the fuel fed to the valve. Foreign bodies inside the valve which originate from components inserted into the valve, from wear of stop surfaces or from production-related burring are not filtered out however, resulting in the danger of blockages or leakage at the valve seat. The valve needle (18) proposed, for a fuel-injection valve for instance, has a filter element (20) integrated in or on it. The function of this filter element (20) is to keep any particles or other impurities inside the valve upstream of the valve seat (30) away from the valve seat (30) and hence avoid blockages or leakage at the valve seat (30). The valve needle proposed is particularly suitable for use in injection valves in fuel-injection systems for mixture-compression external-ignition-combustion engines.