Patent ID: 8127524
Filing Date: 2012-03-06
Classification: F02C,F05D

Abstract:
1. A fuel system for a turbine engine comprising: a pump with a motor rotating the pump in first and second directions opposite from one another, the first direction for delivering fuel to a turbine engine and the second direction for evacuating fuel from the turbine engine fuel manifold; a shut-off check valve open in the first direction in response to a first differential pressure created by the pump and biased to a closed position in the second direction; an ecology check valve biased to a closed position in the first direction and open in the second direction in response to a second differential pressure created by the pump; wherein the pump includes first and second ports respectively providing first and second pressures, the first and second ports respectively providing an inlet and an outlet in the first direction, and the first and second ports respectively providing the outlet and the inlet in the second direction; and wherein the first differential pressure is provided by exposing the shut-off check valve to the first and second pressures, the second pressure greater than the first pressure in the first direction.