| 摘要 |
<p>An improved pressure-compensated hydraulic system for feeding hydraulic fluid to one or more hydraulic actuators (20). A remotely located, variable displacement pump (16) provides an output pressure equal to input pressure plus a constant margin. A pressure compensation system requires that a load-dependent pressure be provided to the pump input through a load sense circuit. A reciprocally spooled, multi-ported isolator transmits the load-dependent pressure to the pump input but prevents fluid in the load sense circuit from leaving the load sense circuit and flowing through a relatively long conduit leading to the remotely located pump. In a multi-valve array (12), at least one valve section (13, 14, 15) has a backflow-preventing shuttle valve which prevents backflow through the pressure compensation system if a main relief valve is operative.</p> |
