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公开(公告)号：US5873244A
公开(公告)日：1999-02-23
申请号：US976152
申请日：1997-11-21
CPC分类号： E02F9/2296 , E02F9/2228 , E02F9/2235 , E02F9/2282 , F15B11/16 , F15B21/087 , F15B2211/20546 , F15B2211/3116 , F15B2211/3144 , F15B2211/327 , F15B2211/6346 , F15B2211/6654 , F15B2211/71
摘要： A positive flow control system is provided that uses open-centered control valves in a series connection to provide priority between different fluid circuits and to provide requested flow regardless of the load pressure while minimizing unused or wasted flow. This is accomplished by providing a restriction in the last open-centered control valve to controllably restrict the flow therethrough when the valve is in its neutral position and having the source of pressurized fluid at a minimum displacement position that substantially matches the rate of flow across the restriction. A controller controls the displacement of the source of pressurized fluid and the displacement of the respective open-centered control valves in proportional to the respective input commands. Initial movement of the last open-centered control valve closes off the restricted flow thereacross to the reservoir prior to the source of pressurized fluid being communicated to the associated actuator. The subject system provides priority control and an effective control of wasted fluid while providing the needed flow rate regardless of the load without needing a special control arrangement for priority or separate bypass valve to control wasted flow.
摘要翻译： 提供了一种积极的流量控制系统，其使用串联连接中的开放中心的控制阀来提供不同流体回路之间的优先级，并且在不影响负载压力的同时提供所需的流量，同时最小化未使用或浪费的流量。 这是通过在最后一个开放式中心的控制阀中提供限制来实现的，当阀处于其中立位置并且使加压流体源处于最小位移位置时可控制地限制流过其中的流量，该最小位移位置基本上与穿过 限制。 控制器控制加压流体源的位移和相应的开放中心的控制阀的位移与相应的输入命令成正比。 在加压流体源传递到相关联的致动器之前，最后一个开放式中心控制阀的初始运动关闭了与储存器的限制流。 主题系统提供优先控制和有效地控制浪费的流体，同时提供所需的流量而不管负载如何，而不需要用于优先的特殊控制装置或单独的旁路阀来控制浪费的流量。
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