Patent ID: 6751939
Filing Date: 2004-06-22
Classification: F02C

Abstract:
A fuel flow dividing ecology valve for selectively conveying fuel from a fuel source to at least a secondary gas turbine engine intake manifold during engine operation and withdrawing fuel therefrom upon cessation of engine operation, comprising:an ecology valve portion including a housing, and a piston disposed therein and movable between first and second extreme positions, the piston defining, in conjunction with the housing, a variable volume chamber for withdrawing fuel from the secondary engine intake manifold when the engine is de-energized and the piston moves from the first extreme position toward the second extreme position thereby purging the manifold of fuel; and a flow dividing valve portion having an inlet port for receiving fuel from the source, an outlet port for conveying fuel to the manifold, a control port for supplying an actuating pressure to the ecology valve portion, and a valve spool movable between a first extreme position in which the spool closes the inlet port, a second extreme position allowing fuel flow from the inlet port to the outlet port, and an initial incrementally open position providing a fuel flow path from the inlet port to the control port while precluding fuel flow from the inlet port to the outlet port.