An improved pressure-compensated hydraulic system for feeding hydraulic fluid to one or more hydraulic actuators. A remotely located, variable displacement pump 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, at least one valve section has a backflow-preventing shuttle valve which prevents backflow through the pressure compensation system if a main relief valve is operative.
申请公布号
WO9637708(A1)
申请公布日期
1996.11.28
申请号
WO1996US04518
申请日期
1996.04.02
申请人
HUSCO INTERNATIONAL, INC.
发明人
WILKE, RAUD, A.;HAMKINS, ERIC, P.;LAYNE, MICHAEL, C.;PEDERSEN, LEIF;RUSSELL, LYNN, A.