| 摘要 |
In accordance with an illustrative embodiment of the present invention, a seal structure that provides a leak-proof metal-to-metal seal against an opposing seal surface includes an annular body having an inwardly directed flange and an outwardly directed flange, each flange having a seal foot on the outer portion thereof. The inner foot engages the seal surface first and produces elastic bending of the inner flange as a cantilever beam, together with a rotation of the annular body which reduces the gap below the outer seal foot to zero. Then as the seal structure is forced further against the seal surface, a counter-rotation is applied to the body to correct the first-mentioned rotation, and the lower end face of the body engages the seal surface to provide a limit stop. Internal fluid pressures produce additional sealing forces that vary in proportion to such pressures.
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