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    • 48. 发明授权
    • Metering valve with integral relief and makeup function
    • 计量阀具有一体化的浮雕和化妆功能
    • US07258058B2
    • 2007-08-21
    • US11214957
    • 2005-08-31
    • David P. SmithDaniel T. MatherWayne W. Lark
    • David P. SmithDaniel T. MatherWayne W. Lark
    • F15B13/04
    • F15B13/024F15B13/0433F15B2211/30505F15B2211/30575F15B2211/329F15B2211/353F15B2211/355F15B2211/365F15B2211/55F15B2211/555F15B2211/8609G05D16/2093
    • A metering valve for a work machine hydraulic system is disclosed. The metering valve has an inlet and an outlet, a main poppet, and a solenoid-operated pilot element. The main poppet is movable to pass fluid from the inlet to the outlet, and to block fluid from the inlet to the outlet. The solenoid-operated pilot element is movable between a first position at which pressurized fluid from the inlet pressurizes a control chamber in communication with a control end of the main poppet to urge the main poppet toward the flow-blocking position, and a second position at which the control chamber is communicated with a drain to move the main poppet toward the flow-passing position. The metering valve also has a relief valve element configured to drain pressurized fluid from the control chamber to move the main poppet toward the flow-passing position in response to a pressure at the inlet exceeding a predetermined pressure.
    • 公开了一种用于作业机液压系统的计量阀。 计量阀具有入口和出口,主提升阀和电磁操作的引导元件。 主提升阀可移动以将流体从入口传送到出口,并阻止流体从入口到出口。 电磁操作的先导元件可以在第一位置和第二位置之间移动,在第一位置处,来自入口的加压流体对与主提升阀的控制端连通的控制室进行加压,以将主提升阀推向阻流位置, 所述控制室与排水管连通以将所述主提升阀朝向流动位置移动。 计量阀还具有安全阀元件,该安全阀元件被构造成响应于入口处的压力超过预定压力而从加压流体排出控制室以将主提升阀移向流通位置。