Uni-directional valve, filtering face mask
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United States of America Patent
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Dec 16, 2014
Grant Date -
Apr 19, 2012
app pub date -
Sep 22, 2011
filing date -
Oct 1, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A uni-directional valve for an air path of a ventilation device. A flexible valve element is held biased in a housing of the uni-directional valve to close at least one air passage located in a sealing section and with a sealing portion to at least partially open the air passage if the valve element is impinged by a sufficient air pressure against the bias. The valve element is designed as cylinder and the sealing portion is located on the lateral surface of the cylinder. The sealing portion is located opposite to a support portion located on the lateral surface of the cylinder. The support portion interacts with a support section of the housing. The distance between the support section and the sealing section of the housing is smaller than the distance between the support portion and the sealing portion in the unbiased state of the valve element.
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