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    • 63. 发明公开
    • Pilot operated control valves
    • Vorgesteuertes Steuerventil
    • EP1050703A2
    • 2000-11-08
    • EP00303408.9
    • 2000-04-20
    • Husco International, Inc.
    • Yang, Xiaolong
    • F16K31/40
    • F15B13/015F16K31/408
    • A pilot operated control valve has a body with an inlet 18 and an outlet 20. A main valve poppet 24 is movable within the body to selectively control flow of fluid between the inlet and outlet. The main valve poppet has a flexible diaphragm 29 with a pilot passage 30 therethrough which is opened and closed by movement of a pilot poppet 44. The diaphragm 29 flexes due to a pressure differential that acts on the pilot poppet, which flexing compensates for adverse effects that the pressure differential has on the operation of the pilot poppet.
    • 先导操作的控制阀具有带入口18和出口20的主体。主阀提升阀24可在主体内移动以选择性地控制入口和出口之间的流体流动。 主阀提升阀具有柔性隔膜29,其具有通过其中的先导通道30,该导向通道30通过先导提升阀44的运动而打开和关闭。隔膜29由于作用在先导提升阀上的压差而弯曲,该压力差作用在先导提升阀上,该挠曲补偿了不利影响 压差与飞行员提升阀的操作有关。
    • 64. 发明授权
    • HYDRAULIC VALVE TO MAINTAIN CONTROL IN FLUID-LOSS CONDITION
    • 液压制动安全阀
    • EP0836678B1
    • 2000-11-08
    • EP96916815.2
    • 1996-05-29
    • Husco International, Inc.
    • WILKE, Raud, A.
    • F15B13/01
    • F15B13/01Y10T137/2554
    • A hydraulic fluid-loss control valve for preventing uncontrolled load movement in the event of a fluid loss such as from the bursting of a hose and further for allowing an operator to move the looad in a controlled way despite the fluid loss. The control valve is situated between a conventional main spool valve and a piston/cylinder hydraulic actuator which powers the load. The control valve has a spool sliding reciprocally in a bore. Grooves and lands on the spool combine with passages in the control valve body to provide alternate fluid paths between a pump and the actuator and between the actuator and a reservoir. Fluid can flow from a controlled chamber of the actuator only when the spool is in a position which provides a fluid path. A passage within the spool provides fluid communication between an input fluid flow and a chamber at one end of the spool. A second passage within the spool provides fluid communication between an actuator chamber and a chamber at the other end of the spool. The position of the spool is determined by the balancing of the opposing end-chamber pressures, which is under the control of the operator.
    • 66. 发明公开
    • HYDRAULIC VALVE TO MAINTAIN CONTROL IN FLUID-LOSS CONDITION
    • 液压制动安全阀
    • EP0836678A1
    • 1998-04-22
    • EP96916815.0
    • 1996-05-29
    • Husco International, Inc.
    • WILKE, Raud, A.
    • F16K3F15B11F15B13
    • F15B13/01Y10T137/2554
    • A hydraulic fluid-loss control valve for preventing uncontrolled load movement in the event of a fluid loss such as from the bursting of a hose and further for allowing an operator to move the looad in a controlled way despite the fluid loss. The control valve is situated between a conventional main spool valve and a piston/cylinder hydraulic actuator which powers the load. The control valve has a spool sliding reciprocally in a bore. Grooves and lands on the spool combine with passages in the control valve body to provide alternate fluid paths between a pump and the actuator and between the actuator and a reservoir. Fluid can flow from a controlled chamber of the actuator only when the spool is in a position which provides a fluid path. A passage within the spool provides fluid communication between an input fluid flow and a chamber at one end of the spool. A second passage within the spool provides fluid communication between an actuator chamber and a chamber at the other end of the spool. The position of the spool is determined by the balancing of the opposing end-chamber pressures, which is under the control of the operator.