Drain valve, exterior aircraft light unit and power supply box
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United States of America Patent
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-
Mar 9, 2021
Grant Date -
Nov 22, 2018
app pub date -
May 18, 2018
filing date -
May 19, 2017
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A drain valve for draining liquid from an enclosed space comprises a movable plunger, which is movable between a closed position in which the plunger does not allow liquid to flow through the drain valve, and at least one open position, in which the plunger allows liquid to flow through the drain valve; and an elastic element, which is configured to urge the movable plunger into its closed position. The plunger is provided with at least one duct extending through the plunger and allowing fluid to flow through the drain valve when the plunger is positioned in its closed position, wherein said at least one duct is closed by a semi-permeable medium, which is permeable for air and water vapor and impermeable for liquid water.
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