FLOW LIMITING DUCT VENT VALVES AND GAS TURBINE ENGINE BLEED AIR SYSTEMS INCLUDING THE SAME

摘要

Embodiments of a flow limiting duct vent valve (DVV) are provided, as are embodiments of a bleed air system including a flow limiting DVV. In one embodiment, the bleed air system a flow limiting DVV and a first valved device, such as a high pressure regulator. The DVV includes, in turn, a housing assembly having an inlet and an outlet. The inlet is fluidly coupled to the valved device when the bleed air system is installed on a gas turbine engine. A valve element is mounted in the housing assembly and, during operation of the DVV, moves from: (i) the closed position to an open vent position when the pressure differential across the valve element exceeds a first threshold, and (ii) from the open vent position to an overpressure shutoff position when the pressure differential across the valve element exceeds a second threshold greater than the first threshold.

主权项

1. A bleed air system for installation on a gas turbine engine, the bleed air system comprising:
a first valved device; and a flow limiting Duct Vent Valve (DVV), comprising:
a housing assembly having an inlet and an outlet, the inlet fluidly coupled to the first valved device when the bleed air system is installed on the gas turbine engine; anda valve element movably mounted in the housing assembly and normally residing in a closed position, the valve element moving from: (i) the closed position to an open vent position when the pressure differential across the valve element exceeds a first threshold, and (ii) from the open vent position to an overpressure shutoff position when the pressure differential across the valve element exceeds a second threshold greater than the first threshold.