| 摘要 |
<p>A flow control valve which exhibits a drooping response, namely, having a response which causes the flow rate supplied to a hydraulic instrument to be reduced as the discharge flow from a pump increases is disclosed. A spool valve is received in a bore, in which a union is disposed and secured. An orifice is formed in the union, and a sleeve is fitted around the union. A restriction which limits the passage of hydraulic fluid therethrough is formed on the external surface of the sleeve. A pressure differential between the upstream and the downstream side of the restriction is effective to cause a sliding movement of the sleeve to thereby reduce the area of the orifice, thus gradually decreasing the flow rate supplied to the hydraulic instrument.</p> |
