Patent ID: 6050081
Filing Date: 2000-04-18
Classification: F02C,F16K,Y10T

Abstract:
A purging fuel valve for a turbine engine having lines providing pressurized fuel, pressurized hot purge air from the engine, and having a fuel line leading to a combustion area of the engine, the valve comprising:a first annular seal dividing an air chamber receiving the source of pressurized hot air from an outlet chamber communicating with the fuel line;a second annular seal positioned in opposition along a spool axis from the first annular seal and dividing the outlet chamber from a fuel chamber receiving the source of pressurized fuel;a spool extending along the spool axis to move therealong, the spool having a center section:(i) closing the first annular seal while allowing fuel flow through the second annular seal at a first position along the spool axis,(ii) closing the second annular seal while allowing hot purging air through the first annular seal at a second position along the spool axis,(iii) closing both the first and second annular seals at a third position between the first and second positions;whereby fuel coking of the outlet chamber is reduced.