| 摘要 |
Methods and apparatus for sealing a check valve. The check valve includes a closure member, primary and secondary sealing elements, and a spring that urges the closure member into engagement with the primary sealing element. The primary sealing element is retained by a groove formed by the housing and the second sealing elements. Increasing pressure acting on the closure member compresses the primary sealing element and allows the closure member to engage the secondary sealing element. As it compresses, the primary sealing element wipes contamination from the closure member to provide a clean sealing surface for engagement with the secondary sealing element. The secondary sealing element also provides sealing redundancy, which is especially beneficial in gas sealing applications.
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