| 摘要 |
PROBLEM TO BE SOLVED: To provide an air directional control valve capable of maintaining smooth operation without intervening lubricating oil. SOLUTION: The air directional control valve is provided with a spool 11 and a housing 15 slidably fitted with each other. In the air directional control valve to change the air flow direction by moving the spool 11, a DLC coating film 20 composed of amorphous structure mainly made of carbon is applied on the surface of a land part 12 of the spool 11. COPYRIGHT: (C)2006,JPO&NCIPI
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