| 摘要 |
In many complicated castings, such as those utilized to define a gear box for an aircraft jet engine, valve housings or mounting recesses may be integrally formed in the casting. Such housings incorporate a plurality of sealing surfaces which cooperate with a valve mounted therein. The repair of such sealing surfaces when worn is accomplished by machining out all bearing surfaces to a substantially larger diameter, then inserting a sleeve element which fits snugly in the newly machined bore and defines a plurality of sealing surfaces dimensionally identical with the original sealing surfaces formed in the housing.
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