| 摘要 |
An umbrella seal (42) for a valve stem includes an outer cylindrical portion (44) having a diameter larger than the diameter of the valve stem. An upper cylindrical portion (46) is operable to be disposed about the valve stem with an inner cylindrical surface (48) disposed thereabout. A lower cylindrical portion (44) has a diameter larger than the valve stem and is connected to the upper cylindrical portion (46) by a flat section (50). A garter spring (52) is disposed around the outer surface of the upper cylindrical portion (46) in a recess (54). When the inner cylindrical surface (48) is disposed against the surface of the valve stem, the garter spring (52) provides an inwardly directed force thereon. The garter spring (52) expands both radially and tangentially.
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