Patent ID: 9091281
Filing Date: 2015-07-28
Classification: E02F,F15B

Abstract:
1. A control valve assembly for a hydraulic system having a variable displacement first pump and a second pump which supply fluid from a tank for powering a plurality of hydraulic actuators, the control valve assembly comprising: a supply conduit connected to the first pump for conveying fluid to the plurality of hydraulic actuators; a return conduit for conveying fluid to the tank; a plurality of control valves, each having a first inlet coupled to receive fluid from the supply conduit and a variable metering orifice for controlling flow of fluid from the first inlet to one of the plurality of hydraulic actuators, each control valve also including a variable bypass orifice, wherein the variable bypass orifices of the plurality of control valves are connected in series between a bypass node and the return conduit thereby forming a bypass passage, and wherein the bypass node is operatively connected to receive fluid from the second pump; a plurality of first flow direction limiting devices, each providing a path through which fluid is able to flow only from the supply conduit to the first inlet of one of the plurality of control valves; and a plurality of second flow direction limiting devices, each providing another path through which fluid is able to flow only from the bypass passage to the first inlet of one of the plurality of control valves.