| 摘要 |
<p>The present invention comprises a transport system having an annular inflatable seal which has an annular interior domed portion which expands as an integral unit until it contacts the edge of a butterfly valve which engages the domed portion to form a slight recess in the annular seal which provides an airtight and locking seal with the annular seal having a pair of annular resilient legs operable to return the annular interior domed portion to its original position to permit the butterfly valve to be opened.</p> |
