| 摘要 |
PROBLEM TO BE SOLVED: To provide a coupling with a switching valve which necessitates no space for attaching a liquid extracting plug, permits miniaturization and facilitates liquid extracting work. SOLUTION: An operating shaft 20 constituted of a switching valve 17 and a liquid extracting plug mechanism unit 40 to open and close a heat medium main passage 15 by operating the switching valve 17 is constituted of a valve body, whose one part constitutes the switching valve 17 to effect the communicating and intercepting function of the heat medium main passage 15, and a communicating passage 21 formed in the shaft 20 so as to be communicated with the heat medium main passage 15. A liquid extracting plug mechanism unit 40, equipped with a liquid extraction operating unit 43 and a liquid extracting passage 41, communicated with the communicating passage 21 of the operating shaft 20 and serving as a liquid extracting passage 41 which becomes a passage upon extracting the liquid, is attached to the operating shaft 20. In this case, the liquid extracting passage 41 of the liquid extracting mechanism unit 40 is positioned so as to be substantially coaxial with the central axis of the operating shaft 20 for the switching valve 17.
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