| 摘要 |
A ram seal element adapted for use with a ram block and ram block holder in a blow out preventer apparatus to provide sealing of drill strings of varying diameters. The ram seal element is a semi-circular elastomer having a diametrical portion and a circumferential portion. The diametrical portion includes a center collar section and two side sections with the collar section being adapted for sealing contact with the drill string. The diametrical portion is provided on its outer side surface with a longitudinal channel defining an expansion zone into which the seal can expand uniformly to accommodate drill strings of increasing size.
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