| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow passage switching valve such as a three-way switching valve capable of moderately performing switching operation, effectively suppressing the occurrence of liquid-back or impact noises, and reducing power consumption in comparison with a solenoid valve.SOLUTION: The flow passage switching valve includes a switching valve body 2 configured to take a first circulation state for bringing a first main valve part 10A into a fully opened state and a second main valve part 10B into a fully closed state, and a second circulation state for bringing the first main valve part 10A into a fully closed state and the second main valve part 10B into a fully opened state, and a flow regulating valve 3 for respectively regulating the pressure of back pressure chambers 17A, 17B of the first main valve part 10A and the second main valve part 10B. The flow regulating valve 3 is configured to make the switching valve body 2 take the first circulation state by gradually reducing the pressure of the back pressure chamber 17A of the first main valve part 10A and the second circulation state by gradually reducing the pressure of the back pressure chamber 17B of the second main valve part 10B. |
