Patent ID: 8429892

Claim:
A fuel valve for a turbine engine, the fuel valve comprising: a housing comprising: a cavity formed by an upstream end, a downstream end, and sidewalls connecting the upstream and downstream ends; an upstream end inlet; a downstream end outlet; a fuel inlet located on at least one of the sidewalls and suitable for connecting to a supply of fuel, a purge inlet located on at least one of the sidewalls and suitable for connecting to a supply of purge air, a hollow spool disposed within the cavity and movable via a fuel pressure from the upstream end inlet, the hollow spool comprising: a solid wall facing the upstream end inlet, a first inlet lateral aperture, a second inlet lateral aperture, and an outlet aperture on a wall facing the downstream end outlet which enables or disables the supply of fuel and purge air from the fuel and purge air inlets to the downstream end outlet, the hollow spool being movable in sequence from a first position where both the first and second inlet lateral apertures are not aligned with the purge air and fuel inlets to a second position where the first inlet lateral aperture is aligned with the purge air inlet and the second lateral inlet aperture is not aligned with the fuel inlet to a third position where the first inlet lateral aperture is not aligned with the purge air inlet and the second inlet lateral aperture is aligned with the fuel inlet.