| 摘要 |
A flow reversing valve includes a reversing valve main body adapted to assume a first circulatory state where a first main valve part is in a fully-open state and a second main valve part is in a fully-closed state and a second circulatory state where the first main valve part is in a fully-closed state and the second main valve part is in a fully-open state; and a flow regulating valve adapted to regulate the pressures of the respective back pressure chambers and of the first main valve part and the second main valve part. The flow regulating valve places the reversing valve main body in the first circulatory state by gradually reducing the pressure of the back pressure chamber of the first main valve part, and in the second circulatory state by gradually reducing the pressure of the back pressure chamber of the second main valve part.
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