| 摘要 |
PROBLEM TO BE SOLVED: To reduce sticking of a spool caused by foreign matters included in the oil at an inlet port or a draining port. SOLUTION: Grooves 30 and 31 as sumps for foreign matters are formed in positions mating with at least one of the inlet port Pi and draining port Pd of the spool 21. COPYRIGHT: (C)2007,JPO&INPIT
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