| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a constant-flow valve which is compact and equipped with a simple structure and moreover suppresses overshoot in low-pressure range and cavitation in high-pressure range. Ž<P>SOLUTION: The constant-flow valve, which comprises: an outer-side valve member changing a cross-sectional area of a first channel formed, in a space with an inner-circumferential section of constant flow valve body; an inner-side valve member which is arranged slidably in the inside of the outer-side valve member, and changes a cross-sectional area of a second channel formed between a periphery and an inner-circumferential section of the outer-side valve member; an outer-side coil spring which slides the outer-side valve member when a hydraulic pressure is applied to the outer-side valve member, and contracts so that the cross-sectional area of the first channel is reduced; and an inner-side coil spring which slides the inner-side valve member when the hydraulic pressure is applied to the inner-side valve member, and contracts so that the cross-sectional area of the second channel may be reduced, wherein a spring constant of the inner-side coil spring is larger than the spring constant of the outer-side coil spring, and the outer-side coil spring becomes larger in the spring constant, as the outer-side valve member moves. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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