| 摘要 |
A dual containment fitting comprises an intermediate annular body having a bore therethrough and an outside surface including a nose portion at one end and a threaded portion adjacent the nose portion. The bore includes a threaded portion opposite the nose portion, a collar adjacent the threaded portion, a sleeve adjacent the collar, and an annular shoulder between the sleeve and collar. An annular fitting body has a bore therethrough and an outside surface including a nose portion at one end that is inserted into a flared end portion of an inner tube, and a threaded portion adjacent the nose portion. The nose portion of the fitting body is inserted within the intermediate body bore and is threadably engaged with the intermediate body bore about respective threaded portions, compressively engaging the flared end between the nose portion and the annular shoulder to form a first attachment fitting. The nose portion of the intermediate body is inserted into a flared end portion of an outer tube disposed concentrically around the inner tube. An annular nut has a bore therethrough and is disposed around the outer tube at the flared end. The nut bore has a threaded portion at one end and a non-threaded portion adjacent the threaded portion having an annular shoulder at an opposite end. The flared end portion of the outer tube is compressively engaged between the nose portion of the intermediate body and the annular shoulder of the nut bore by threadable engagement of the threaded nut bore around a threaded portion of the intermediate body to form a second attachment fitting.
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