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    • 1. 发明授权
    • Spool valve assembly
    • 阀体组件
    • US3662783A
    • 1972-05-16
    • US3662783D
    • 1970-02-02
    • PARKER HANNIFIN CORP
    • STACEY HUGH J
    • F15B13/02F15B13/04F16K11/07
    • F15B13/04F15B13/02Y10S411/996Y10T137/7613Y10T137/87193
    • A spool valve assembly having a flow control and cam spool which cams pilot check valve members to unseated position to initiate return flow of fluid from a fluid motor to a tank, said assembly being characterized in that the pilot operated check valves are disposed in cartridges which are adjustable in the valve housing to enable accurate positioning of the cam operated pilot check valves with respect to the spool cams. The assembly herein is further characterized in that although the main check valve is opened by differential fluid pressure upon cam opening of the pilot check valve, the main check valve is prevented from closing so long as the valve spool is in operating position. The assembly herein also has means to prevent buildup of pressure in the valve chambers upstream of the cam operated check valves so that fluid leaking past the spool land at the pressure inlet is vented to the tank via the upstream chambers aforesaid. Still another characterizing feature of the invention is that the pilot operated check valves have chatter or flutter preventing means which precludes inadvertent closing of that check valve which is on the pressure side due to pressure surges or pulsations, or other sudden rise in pressure between the fluid motor and the spool valve assembly.
    • 一种滑阀组件,其具有流量控制和凸轮滑阀,其将导向止回阀构件转动到非转动位置,以启动流体从流体马达向罐返回流动,所述组件的特征在于,先导操作的止回阀设置在盒中, 在阀壳体中是可调节的,以使得凸轮操作的导向止回阀相对于卷轴凸轮能够精确定位。 这里的组件的特征还在于,虽然主止回阀在导向止回阀的凸轮打开时由差动流体压力打开,但是只要阀芯处于工作位置,就可以防止主止回阀关闭。 本文中的组件还具有防止在凸轮操作的止回阀上游的阀室中的压力积聚的装置,使得经过压力入口处的阀芯接头泄漏的流体经由上述上游室排放到油箱。 本发明的另一特征在于,先导操作的止回阀具有颤动或防颤动装置,其阻止由于压力波动或脉动而在压力侧的止回阀或其他液体之间的压力突然上升导致的无意关闭 电机和滑阀组件。