Electronic unit injectors
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United States of America Patent
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Dec 14, 2010
Grant Date -
Mar 4, 2010
app pub date -
Aug 29, 2008
filing date -
Aug 29, 2008
priority date (Note) -
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Abstract
An electronic unit injector comprising a spray tip including a valve seat, a needle valve arranged to close on the seat to prevent discharge of fuel from the spray tip or to open off the seat to dispense fuel from the spray tip, a spring biasing the needle valve to a closed position, a spring seat between the spring and the needle valve, the needle valve overcoming the biasing force when the pressure reaches a predetermined level, the spring and seat being disposed in a cage having port areas circumferentially arranged about said spring and spring seat to supply low pressure fuel to the area occupied by said spring and spring seat to reduce the risk of cavitation in said spring cage.
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