Combining valve with fuel relief and sealing
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United States of America Patent
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Feb 10, 2015
Issued Date -
N/A
app pub date -
Jan 9, 2009
filing date -
Jan 11, 2008
priority date (Note) -
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Abstract
A combined fuel and purge air valve for a turbine engine has an onboard residual fuel reservoir to relieve pressure transients in the fuel circuit during purge air mode operation. The fuel reservoir also operates to effectively seal the fuel circuit with fuel present in the valve chamber by venting any purge air that should happen to leak past the primary seals. A 3-way spool valve controls the transition between start-up and sustained fuel operation modes as well as the purge air operation mode. A movable shuttle controls the communication of the fuel circuit with the fuel reservoir and ensures that the fuel reservoir is open in the purge air mode and closed off in the fuel modes. Pilot air activates the shuttle and spool valve and fuel pressure provides biasing forces. Fuel is distributed through an array of outlet ports, and the valve is cooled by an integral coolant jacket.
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