| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a valve device capable of effectively preventing failure in sliding of a spool caused by flowing-in of foreign matters, without lowering productivity while securing filtering function. SOLUTION: A peripheral wall 21A of a valve body 21 is provided with port grooves 38, 39, an output oil chamber 35A is formed on an axial position corresponding to the port groove 38, and an input oil chamber 36A is formed on an axial position corresponding to the port groove 39. The output oil chamber 35A and the input oil chamber 36A are communicated with each other through a valve hole 21a formed in the valve body 21. Thin parts 42, 43 as bottom wall parts of the port grooves 38, 39 are respectively provided with fine through pores 44, 45 for communicating the external and each of the oil chambers 35A, 36A. The thin parts 42, 43 can act as strainer parts for filtering the foreign matters mixed in hydraulic oil flowing into the valve body 21. COPYRIGHT: (C)2006,JPO&NCIPI
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