| 摘要 |
PROBLEM TO BE SOLVED: To improve the stability in controlling the spool position by reducing the operational force of a spool. SOLUTION: This flow control valve comprises a valve housing 1 and a spool 3 displaceably provided in the axial direction X-X in the valve housing 1. A pilot pressure chamber 13 and a spring chamber 21 having the sectional area different from the sectional area of a pilot pressure chamber 13 are provided on both end sides of the spool 3. The pressure of the fluid F fed in the pilot pressure chamber 13 is regulated by a pilot valve 18. A return spring 22 to press a spool 3 against the pilot pressure chamber 13 side is provided in the spring chamber 13. The fluid F to be fed from an input port 10 is introduced in a hydrostatic passage 23 to communicate the pilot pressure chamber 13 with the spring chamber 21, and the spool position is controlled by applying the hydrostatic pressure to both the pilot pressure chamber 13 and the spring chamber 21. COPYRIGHT: (C)2004,JPO
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