| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-way switching valve 6 employed for a pressure intensifying type injector which prevents a first flow passage 39 and third flow passage 52 from communicating to each other in a transient period of flow passage switching. SOLUTION: The three-way switching valve 6 forces a first valve element 49 to open/close a space between a first flow passage 39 and second flow passage 41 by taking the displacement to one side as an opening direction and the displacement to the other side as a closing direction, and a second valve element 50 to open/close a space between a second flow passage 41 and third flow passage 52 by taking the displacement to one side as a closing direction and the displacement to the other side as an opening direction and to start the displacement to the other side with a delay from the first valve element 49 when back pressure starts dropping. Consequently, after the first valve element 49 closes a space between the first flow passage 39 and second flow passage 41, the second valve element 50 can open a space between the second flow passage 41 and third flow passage 52. As a result, communication between a first flow passage 39 and third flow passage 52 in the transient period of flow passage switching can be prevented. COPYRIGHT: (C)2008,JPO&INPIT
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