Valve having a bias-mounted elastomeric sealing element, and method of constructing the same
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United States of America Patent
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-
Feb 15, 1983
Grant Date -
N/A
app pub date -
Jul 28, 1980
filing date -
Jul 28, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A radially inner portion of a flat annular elastomeric washer is inserted and retained in a frustoconical annular groove formed in a cylindrical valve seat of an inline disc check valve. The groove is positioned and dimensioned so that it grips the washer and holds it in a radially stretched, axially skewed configuration wherein one of the washer's outer peripheral corner edges forms a leading sealing edge of the valve seat. At low back pressures in the valve, a line seal is formed between the leading washer edge and the valve's closure disc. High back pressures cause the disc to rearwardly deflect the protruding radially outer portion of the washer and engage the valve seat itself. Because the installed washer is both radially stretched and axially skewed, forward flow through the valve does not tend to dislodge the washer, and reverse flow around the washer portion within the groove is prevented.
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