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    • 1. 发明申请
    • VALVE ARRANGEMENT FOR THE HYDRAULIC CIRCUIT OF A WORK MACHINE
    • 工作机液压回路阀装置
    • WO2014186201A1
    • 2014-11-20
    • PCT/US2014/037259
    • 2014-05-08
    • CATERPILLAR INC.
    • LUCAS, Nathan, J.SWICK, William, C.GORDON, Matthew
    • E02F9/22A01B63/00B66F17/00F15B13/01
    • F15B13/0401E02F9/226E02F9/2271E02F9/2285E02F9/2289F15B11/003F15B11/08F15B13/015F15B13/025F15B13/027F15B13/044F15B20/005F15B2211/25F15B2211/30515F15B2211/355F15B2211/40576F15B2211/50518F15B2211/50554F15B2211/50581F15B2211/5153F15B2211/575F15B2211/634F15B2211/6355F15B2211/862F15B2211/8636F15B2211/865
    • The present disclosure relates to a valve arrangement (60) for a boom control system (30) or for other control systems for work machine (10) components that may be lowered under gravity. The problem addressed is the prevention of the boom (13) or other work machine (10) component from dropping uncontrollably under a hose burst condition. The disclosure provides a valve arrangement (60) for a hydraulic system (30) for raising and lowering a component of a work machine (10). The valve arrangement (60) comprises an inlet (61) and an outlet (62). A pilot operated load control valve (63) is fluidly connected between the inlet (61) and the outlet (62), the load control valve (63) having an energised unidirectional state allowing hydraulic fluid to pass from the outlet (62) to the inlet (61) and a de-energised unidirectional state allowing hydraulic fluid to pass from the inlet (61) to the outlet (62). A pilot conduit (65) is configured to direct pilot hydraulic fluid to actuate the load control valve (63). A connecting conduit (67) fluidly connects the pilot conduit (65) to the inlet (61), the connecting conduit (67) comprising a flow restriction (68) and a check valve (69) configured to allow hydraulic fluid to flow only in a direction from the pilot conduit (65) towards the inlet (61).
    • 本公开涉及一种用于起重臂控制系统(30)或用于可能在重力作用下降低的作业机(10)的其它控制系统的阀装置(60)。 所解决的问题是防止吊杆(13)或其他作业机器(10)部件在软管爆裂状态下不受控制地丢弃。 本公开提供了一种用于液压系统(30)的用于升高和降低作业机械(10)的部件的阀装置(60)。 阀装置(60)包括入口(61)和出口(62)。 先导操作的负载控制阀63流体连接在入口(61)和出口(62)之间,负载控制阀(63)具有通电的单向状态,允许液压流体从出口(62)传递到 入口(61)和允许液压流体从入口(61)通过到出口(62)的断电单向状态。 导向管道(65)构造成引导先导液压流体致动负载控制阀(63)。 连接管道(67)将先导管道(65)流体地连接到入口(61),连接管道(67)包括流量限制(68)和止回阀(69),该止回阀(69)构造成允许液压流体仅在 从导向管道(65)朝向入口(61)的方向。