| 摘要 |
PURPOSE:To control flow of a bypass passage without any influence on flow of a main passage by disposing a plurality of magnetic pole generating portions, the polarity of which can be converted, in the periphery of a rotary valve element with a permanent magnet. CONSTITUTION:The first magnetic pole generating portion 22 and the second magnetic pole generating portion 23, the polarity of which can be converted are disposed in the periphery of a disc rotary valve element 18 provided with a permanent magnet 19, so that the rotary valve element 18 can take an arbitrary position. Two communicating holes 25, 27 for communicating two connecting pipes among the first to fourth connecting pipes C, D, E, S, and a bypass through hole 29 for communicating a bypass connecting pipe 28 with the first connecting pipe D are formed on the rotary valve element 18. In this arrangement, a main passage and bypass passage can be switched parallel by setting the position relationship between the communicating holes 25, 27 and the bypass through hole 29.
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