| 摘要 |
A valve assembly includes alternate tubular fittings and a valve body. A selected tubular fitting is open at both ends and has an interval with external threads. This interval includes distal external threads and proximal external threads on opposite sides of a predetermined axial position on the fitting. The valve body has a bore with a mouth that is at least partially pre-tapped with internal body threads independently of the fitting. The proximal threads are sized to threadably engage the internal body threads in the valve body. The distal external threads (a) have substantially lower crests than threads located proximally from the predetermined position, (b) are sized to pass through the at least one bore without threading onto the internal body threads, and (c) are sized to thread into and modify the bore at a location deeper than the internal body threads by self-tapping. The distal external threads pass by the internal body threads without fully threading onto them.
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