Three-way valves and fuel injectors using the same
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United States of America Patent
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Oct 9, 2012
Grant Date -
Apr 5, 2012
app pub date -
Nov 7, 2011
filing date -
Dec 21, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Three-way valves having reduced leakage and fuel injectors using the same. Three-way spool poppet valves are disclosed having a spool with a poppet valve thereon cooperating with a seat on the valve housing to provide a substantially leak free valve closing in one direction characteristic of a poppet valve while preserving the advantages of a spool valve. Three-way ball valves are also disclosed having substantially leak free valves closing in both directions, but further including reduced short circuit losses due to direct flow from a high pressure source to a low pressure vent during transition of the ball from one position to the opposite position. Fuel injectors with direct needle control using the three-way valves of the present invention are also disclosed.
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