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    • 32. 发明公开
    • PIPE BREAKAGE CONTROL VALVE DEVICE
    • 水力发电系统
    • EP1227249A1
    • 2002-07-31
    • EP01930128.2
    • 2001-05-15
    • HITACHI CONSTRUCTION MACHINERY CO., LTD.
    • KARIYA, MasaoSUGIYAMA, GenrokuTOYOOKA, Tsukasa
    • F15B11/08F15B20/00
    • F15B11/003F15B13/01F15B2211/20538F15B2211/30515F15B2211/30525F15B2211/3116F15B2211/31558F15B2211/31576F15B2211/329F15B2211/40515F15B2211/41527F15B2211/428F15B2211/46F15B2211/50518F15B2211/55F15B2211/6355F15B2211/8636
    • In a hose rupture control valve unit comprising a main valve constituted by a poppet valve member and a pilot valve constituted by a spool valve member, a hydraulic fluid can be supplied from a hose connection chamber to a cylinder connection chamber even in the condition of a pilot pressure acting upon the spool valve member, so that the smooth operation can be obtained without a delay in opening of the poppet valve member upon an abrupt reversed lever operation.
      A hose rupture control valve unit 200 comprises a poppet valve member 5 serving as a main valve for opening and closing communication between a cylinder connection chamber 8 and a hose connection chamber 9, a spool valve member 6 disposed in pilot passages 15a, 15b connecting a back pressure chamber 10 and the hose connection chamber 9 of the poppet valve member 5, the spool valve member being operated by a pilot pressure supplied as an external signal and operating the poppet valve member 5, and a small relief valve 7 having the function of an overload relief valve. The valve unit further comprises a check valve 39 disposed in the pilot passage 15b for cutting off a flow of the hydraulic fluid from the hose connection chamber 9 to the back pressure chamber 10.
    • 在包括由提升阀构件和由滑阀构件构成的先导阀构成的主阀的软管断裂控制阀单元中,即使在一个状态下,液压流体也可以从软管连接室供给到气缸连接室 先导压力作用在滑阀构件上,使得可以在突然反转杆操作时不会延迟提升阀构件的打开而获得平稳的操作。 软管破裂控制阀单元200包括作为用于打开和关闭气缸连接室8和软管连接室9之间的连通的主阀的提升阀构件5,设置在连接一个 提升阀构件5的背压室10和软管连接室9,滑阀构件通过作为外部信号提供的先导压力进行操作并操作提升阀构件5,以及小型安全阀7,其具有 一个过载溢流阀。 阀单元还包括设置在先导通道15b中的止回阀39,用于切断液压流体从软管连接室9到背压室10的流动。