| 摘要 |
The invention relates to a pressure fuel servicing nozzle for mating with a standardized aircraft fueling adapter having an adapter valve biased in a closed position to prevent fuel flow. The fuel nozzle includes a nozzle body and a collar assembly coupled to the nozzle body. Fuel flow is prevented when the nozzle valve is in a fully retracted position and fuel flow is allowed when the nozzle valve is extended and when the nozzle valve pushes the adapter valve in a downstream direction. A bias member maintains the nozzle valve in fully open position when intimate contact between the valves is disrupted, such as when fuel flow forces the adapter valve further in the downstream direction. The fuel nozzle further includes a collar assembly rotatably coupled to the nozzle body such that the fuel nozzle is secured to the fueling adapter by engaging the fuel nozzle onto the fueling adapter and rotating the collar assembly about the nozzle body and fueling adapter. The collar assembly is adapted to form a first mechanical interference to prevent initial rotation of the collar: assembly about the nozzle body and fueling adapter, wherein the first mechanical interference is cleared by positioning the fuel nozzle onto the fueling adapter such that the lock tabs drive a member a distance a away from a first stop. The collar assembly is further adapted to form a second mechanical interference to prevent final rotation of the collar assembly about the nozzle body and fueling adapter, wherein the second mechanical interference is cleared by further positioning the fuel nozzle onto the fueling adapter such that the lock tabs drive the member a distance b away from a second stop. The distance b is greater than the distance a.
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