| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-way selector valve of a pilot operation type that has a compact valve mechanism, can switch between flow channels of high-pressure fluid, and has no internal leakage of the fluid. SOLUTION: The valve has one main valve element 5, one piston 14, and one solenoid, and the valve mechanism is made compact. A pilot valve driven by the solenoid including a pilot valve element 20 introduces high pressure of an inlet port 2 to a pressure control chamber of a piston 14 via a passage 22, and introduces low pressure of first or second output port 3 or 4 on the no-fluid side via two check valves including passages 24 and 25 and valve elements 26 and 29, and passages 31 and 32, thereby changing the main valve. In changing the main valve, the pressure of the pressure control chamber of the piston 14 or the low pressure side of the pilot valve is released to the first or second output port of low pressure on the closed side of the main valve element 5. While, after the changing, fluid does not flow, and slight leakage of the fluid for keeping the changing state of the main valve dose not occur. COPYRIGHT: (C)2004,JPO
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