| 摘要 |
A flow control valve which exhibits a so-called drooping response is provided which causes the flow rate supplied to a hydraulic instrument to be reduced as a discharge flow from a pump increases. A union is inserted into and fixedly connected to a bore which receives a spool valve, and is formed with an orifice. A sleeve having an outer diameter which varies in its axial direction is fitted around the union, thereby defining a restricted passage on the outside of the sleeve which restricts the passage of a hydraulic fluid. A pressure differential between the upstream and the downstream side of the restricted passage is effective to slide the sleeve, thereby reducing the opening of the orifice to reduce the flow rate supplied to the hydraulic instrument in a gradual manner.
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