Leaf valve structure
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United States of America Patent
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Dec 1, 2015
Grant Date -
Sep 13, 2012
app pub date -
Mar 24, 2011
filing date -
Apr 2, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A leaf valve structure according to this invention comprises an annular valve seat, and a leaf that is seated on the valve seat under a predetermined elastic supporting force against a pressure of a working fluid on an inner side of the valve seat. A recessed depression portion having an opening portion on both an inner periphery of the valve seat and a seating surface of the leaf is formed in the valve seat, thereby creating a site where the pressure of the working fluid on the inner side of the valve seat can act more easily on a seating surface between the valve seat and the leaf valve. Accordingly, an effect of a surface adsorption force applied to the leaf valve by the valve seat on a cracking pressure can be suppressed, and as a result, the leaf valve can be lifted under a stable cracking pressure.
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