| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a port interval needs to be large, valve length becomes long, and at the same time the number of sealing materials between them increases to prevent the abouchement while a valve is traveling when switching a heating medium by a reciprocating movement-switching valve. SOLUTION: When the reciprocating movement switching valve travels from a stop position (either of first, second, and third stop positions) to a next stop position (either of the first, second, and third positions), a stop valve 36 stops the flow of the heating medium, thus preventing the abouchement of the heating medium from occurring by a heating medium switching valve 29 on switching, reducing the valve length of the reciprocating movement switching valve by approximately 1/2, and reducing the size and weight of a heating medium- switching means. Also, since the number of sealing materials can be reduced by approximately 1/2, traveling resistance by the sealing materials can be reduced by approximately 1/2, thus smoothly and reliably switching the reciprocating movement switching valve.
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