| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve gear capable of preventing decompression boiling of working liquid and separation of solved air. SOLUTION: In the valve gear 1 communicated with a low pressure chamber 4 supplying working fluid, when a control chamber 3 is decompressed, to the control chamber 3 which working fluid is supplied in/exhausted out of to open and close the valve 2, a first passage 12 for establishing communication between the control chamber 3 and the low pressure chamber 4, a check valve 13 provided in the first passage 12 and opening the first passage 12 when the control chamber 3 is decompressed lower than the low pressure chamber 4 to supply working fluid in the low pressure chamber 4 to the control chamber 3, a second passage 14 for establishing communication between the first passage 12 in an upstream side of the check valve 13 and the first passage 12 in a downstream of the same, and an introduction valve 15 provided in the second passage 14 and opening the second passage 14 to raise pressure in the low pressure chamber 4 for introducing working fluid in the control chamber 3 to the low pressure chamber 4 are provided. COPYRIGHT: (C)2008,JPO&INPIT
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