| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow passage selector valve which can elongate a stroke of selection of a valve with an inexpensive structure using no electromagnet. SOLUTION: A box body 5 of a flow passage selector valve 1 has an air inflow port 2 two air outflow ports 3, 4, and a cylinder chamber in which an operation valve 6 is arranged. A shape memory spring 7 is arranged between the operation valve 6 and the box body 4. The spring 7, being heated to a specified temperature or more by means of a heater 8, recovers its shape for moving the valve 6 leftward. The relation between the air inflow port 2 and the air outflow ports 3, 4 are changed over. When heating by the heating 8 is stopped and the temperature of the shape memory spring 7 is lowered, the spring 7 is deformed and an original state is recovered. In another case, a backup spring may be arranged for assisting deformation of the shape memory spring 7.
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