Snap acting split flapper valve
First Claim
Patent Images
1. An aircraft cabin air filtration system comprising:
- an inlet configured to receive a flow of air from an airflow source;
an outlet configured to exhaust the flow of air to the aircraft cabin;
an air filter positioned between the inlet and the outlet, the air filter being fluidly coupled to the inlet and the outlet and configured to filter the flow of air, whereby a differential pressure is developed between the inlet and the outlet; and
a bypass valve positioned between the inlet and the outlet and in parallel with the air filter, the bypass valve being fluidly coupled to the inlet and the outlet and movable between an open position, in which the flow of air is bypassed around the filter, and the closed position, in which the flow of air is not bypassed around the filter, the bypass valve configured to move to the open position when the differential pressure magnitude reaches a predetermined opening value, the filter bypass valve including;
a valve body having one or more flow channels extending therethrough, each flow channel having a cross sectional flow area, andone or more flappers rotationally mounted on the valve body and configured to substantially seal the flow channels when the bypass valve is in the closed position and unseal the flow channels when the bypass valve is in the open position, each flapper having a surface area,wherein the cross sectional flow area is less than about 50% of the surface area.
1 Assignment
0 Petitions
Accused Products
Abstract
A filter bypass valve is disposed in parallel with an aircraft cabin air filtration system air filter. During normal operation, air is filtered through the air filter at an air flow that meets air flow requirements of the system. The bypass valve is designed to remain closed during normal use, and to open if the differential pressure across the air filter reaches a predetermined opening differential pressure to allow airflow to be partially or fully diverted around the air filter.
-
Citations
20 Claims
-
1. An aircraft cabin air filtration system comprising:
-
an inlet configured to receive a flow of air from an airflow source; an outlet configured to exhaust the flow of air to the aircraft cabin; an air filter positioned between the inlet and the outlet, the air filter being fluidly coupled to the inlet and the outlet and configured to filter the flow of air, whereby a differential pressure is developed between the inlet and the outlet; and a bypass valve positioned between the inlet and the outlet and in parallel with the air filter, the bypass valve being fluidly coupled to the inlet and the outlet and movable between an open position, in which the flow of air is bypassed around the filter, and the closed position, in which the flow of air is not bypassed around the filter, the bypass valve configured to move to the open position when the differential pressure magnitude reaches a predetermined opening value, the filter bypass valve including; a valve body having one or more flow channels extending therethrough, each flow channel having a cross sectional flow area, and one or more flappers rotationally mounted on the valve body and configured to substantially seal the flow channels when the bypass valve is in the closed position and unseal the flow channels when the bypass valve is in the open position, each flapper having a surface area, wherein the cross sectional flow area is less than about 50% of the surface area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A valve, comprising:
-
a valve body having one or more flow channels extending therethrough, each flow channel having a cross sectional flow area; one or more flappers rotationally mounted on the valve body and rotationally movable between a closed position and an open position, each flapper configured to substantially seal one of the flow channels when it is in the closed position and to rotate to at least a predetermined rotational angle relative to its closed position when it is in the open position, each flapper having a surface area; an annular shroud coupled to and extending axially from the valve body, the annular shroud surrounding each flapper when the flapper is in the closed position; and one or more flapper stops coupled to the valve body and configured to limit the predetermined rotational angle of each flapper to less than 90-degrees, wherein the cross sectional flow area is less than about 50% of the surface area. - View Dependent Claims (14, 15, 16, 17, 18, 19)
-
-
20. A valve, comprising:
-
a valve body having one or more flow channels extending therethrough, each flow channel having a cross sectional flow area; and one or more flappers rotationally mounted on the valve body and rotationally movable between a closed position and an open position, each flapper configured to substantially seal one of the flow channels when it is in the closed position and to rotate to at least a predetermined rotational angle relative to its closed position when it is in the open position, each flapper having a surface area, wherein the cross sectional flow area is less than about 50% of the surface area.
-
Specification