Normally open reverse flow flapper valve
AssigneePratt & Whitney Canada Corp.
InventorsPaul Archibald Aitchison, Patrick David Germain, Henry Smith
Life of this patent
Estimating the term…
Abstract
A fluid flow actuated valve for controlling the fluid flow in a conduit comprises a support structure adapted to be mounted within the conduit and at least one flap member pivotally mounted to the support structure. The at least one flap member is pivotable between an first position for a minimum fluid flow and a second position for a maximum fluid flow. A torsion spring is attached to the at least one flap member to urge the same to pivot against a fluid pressure differential, from the first position to the second position when the fluid pressure differential is smaller than a predetermined level.
Claims11
A passive air cooling apparatus for an aircraft-mounted gas turbine engine for cooling at least a portion of an engine system to be cooled, the gas turbine engine having an air flow passing therethrough, the cooling apparatus comprising:
- a conduit adapted for diverting a cooling air flow from the airflow to the at least a portion of the engine system to be cooled;
- a support structure adapted to be mounted within the conduit;
- at least one flap member pivotally mounted to the support structure, the at least one flap member being pivotable between an first position for a minimum cooling airflow passage and a second position for a maximum cooling airflow passage;
- and
- a torsion spring attached to the at least one flap member to urge the same to pivot against an air pressure differential, from the first position to the second position when the air pressure differential is smaller than a predetermined level.
A gas turbine engine adapted to be mounted on an aircraft, the gas turbine engine having an airflow passing therethrough and including a passive air cooling apparatus for cooling at least a portion of an engine system to be cooled, the cooling apparatus comprising:
- a conduit mounted on the gas turbine engine, adapted to divert a cooling airflow from the airflow to the at least a portion of the engine system to be cooled;
- and
- a valve disposed in the conduit, the valve being positionable between a terminal first position in which the cooling airflow through the conduit is partially blocked by the valve, and a second position in which the cooling airflow through the conduit is substantially unblocked by the valve, the valve being biased towards the second position,
- wherein when a pressure differential sufficient to overcome the biasing of the valve towards the second position is applied across the valve in the conduit, the valve is moved by the pressure differential to the first position.
Dependencies are inferred from the claim text.