| 摘要 |
Well apparatus is disclosed in which an inner member is adapted to be sealed with respect to an outer member by means of a seal ring of elastomeric material surrounding the inner member for movement from a first position about a first cylindrical surface in which its outer diameter is spaced from a cylindrical bore in the outer member, and a second position about a second, larger cylindrical surface in which its inner and outer diameters are sealably engaged with said second surface and bore in the outer member, respectively.
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