| 摘要 |
A direct injection inwardly opening differential valve type nozzle based liquid or gaseous fuel injector with improved speed and frequency of operation by use of an ultra low inertia valve closer unit 10 positioned within the nozzle insertion tip 1of the injector, and with a valve tip 20 which is biased to the closed position by a spring 3 which also has at least part of its axial length within the nozzle insertion tip, and where the entire inertial mass of the valve closer unit 10 is preferably positioned at the tip of the injector. The injector is of benefit but not limited to, VCO and SAC nozzle type fuel injectors piezoelectrically operated from a fuel rail source. High-speed operation with negligible fuel leakage return flow of said nozzle benefits by being driven by the high-speed outward opening piezoelectric metering valve unit (29, fig.14), wherein return flow may be eliminated entirely by application of a venturi preferably inside the fuel injector.
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