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    Hydraulic valve
    1.
    发明授权
    Hydraulic valve 失效

    公开(公告)号：US3613508A

    公开(公告)日：1971-10-19

    申请号：US3613508D

    申请日：1970-07-27

    Applicant: CESSNA AIRCRAFT CO

    Inventor： KREHBIEL ROBERT D ,  GRABER HOMER R

    IPC: F15B13/04 ,  F15B13/042 ,  F15B11/08

    CPC classification number: F15B13/04 ,  Y10T137/87241

    Abstract: A manually operated spool type closed center flow control valve having two lockout check valves, one for each end of a doubleacting pressure fluid actuated motor. The valve affords precise spool metering of pressure fluid returning from either end of the motor to the hydraulic system reservoir because both lockout check valves are fully opened and maintained open prior to, and entirely independent of, any flow of fluid to or from either end of the motor. Thus fluid flowing through either of the fully open lockout check valves can in no way interfere with precise spool metering of flow through the control valve. The flow metering spool can also be positioned to afford floating movement of the motor plunger and rod in either direction in response to an applied external load.

    Hydraulic valve
    2.
    发明授权
    Hydraulic valve 失效

    公开(公告)号：US3596566A

    公开(公告)日：1971-08-03

    申请号：US3596566D

    申请日：1967-05-15

    Applicant: CESSNA AIRCRAFT CO

    Inventor： KREHBIEL ROBERT D ,  GRABER HOMER R

    IPC: F15B13/01 ,  F15B13/04 ,  F15B13/042 ,  F15B11/08

    CPC classification number: F15B13/04 ,  F15B13/01 ,  Y10T137/87241

    Abstract: A manually operated spool-type closed-center flow control valve having two lockout check valves, one for each end of a doubleacting pressure-fluid-actuated motor. The valve affords precise spool metering of pressure fluid returning from either end of the motor to the hydraulic system reservoir because both lockout check valves are fully opened and maintained open prior to, and entirely independent of, any flow of fluid to or from either end of the motor. Thus fluid flowing through either of the fully open lockout check valves can in no way interfere with precise spool metering of flow through the control valve. The flow-metering spool can also be positioned to afford floating movement of the motor plunger and rod in either direction in response to an applied external load.

    Control valve method of manufacture
    8.
    发明授权
    Control valve method of manufacture 失效
    控制阀制造方法

    公开(公告)号：US3659325A

    公开(公告)日：1972-05-02

    申请号：US3659325D

    申请日：1970-06-03

    Applicant: CESSNA AIRCRAFT CO

    Inventor： KREHBIEL ROBERT D ,  MCCAMMOND WARREN E

    IPC: F16K11/07 ,  F16K27/04 ,  B21D53/00 ,  B21K29/00 ,  B23P15/26

    CPC classification number: F16K27/041 ,  F16K11/07 ,  Y10T29/49426

    Abstract: A fluid control valve including a spool whose end exposable to corrosion environment is tapered to a reduced diameter and coated with corrosion resistant material. The reduced diameter facilitates fast, economical final machining and sizing of the spool without damaging the protective coating, for selective fitting within a fluid control valve body bore.

    Abstract translation: 一种流体控制阀，包括一个卷轴，其端部可暴露于腐蚀环境中，锥形到减小的直径并涂有耐腐蚀材料。 减小的直径有助于快速，经济的最终加工和阀芯尺寸，而不会损坏保护涂层，以便选择性地装配在流体控制阀体孔内。

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