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US08375975B2 Load sensing directional control valve with an element having priority under saturation conditions 有权
负载感应方向控制阀，在饱和条件下具有优先权

  • Patent Title: Load sensing directional control valve with an element having priority under saturation conditions
  • Patent Title (中): 负载感应方向控制阀，在饱和条件下具有优先权
  • Application No.: US12666754
    Application Date: 2007-06-26
  • Publication No.: US08375975B2
    Publication Date: 2013-02-19
  • Inventor: Ulderico Busani
  • Applicant: Ulderico Busani
  • Applicant Address: IT Reggio Emilia
  • Assignee: Walvoil S.p.A.
  • Current Assignee: Walvoil S.p.A.
  • Current Assignee Address: IT Reggio Emilia
  • Agency: Young & Thompson
  • International Application: PCT/IT2007/000449 WO 20070626
  • International Announcement: WO2009/001377 WO 20081231
  • Main IPC: G05D11/03
  • IPC: G05D11/03
Load sensing directional control valve with an element having priority under saturation conditions
Abstract:
The invention relates to the field of load sensing, flow sharing directional control valves for controlling an operating machine, such as an excavator. The directional control valve of the present invention is particularly characterized by the addition of at least one element (E4) wherein the provision of a bore (16) and the replacement of components (30), (50), (M1) with a compensator (9), having a spring (14) operating on one side thereof (9a), and a piston/load sensing signal selector (8) impart to this single element (E4) the feature of non participating in flow-rate reduction under saturation conditions, while preserving the feature of maintaining a constant flow-rate to the user, irrespective of the variation of the load.
Abstract(Chinese):

本发明涉及负载感测领域，用于控制诸如挖掘机的操作机器的共用方向控制阀。 本发明的方向控制阀的特征在于，添加至少一个元件（E4），其中提供孔（16）和用补偿器替换部件（30），（50），（M1） （9），具有在其一侧（9a）上操作的弹簧（14），以及赋予该单个元件（E4）的活塞/负载感测信号选择器（8）不参与在饱和下的流量降低的特征 条件，同时保持向用户维持恒定流量的特征，而与负载的变化无关。

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