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各种作业工况复合动作问题：例如：掘削装载工况，平整地面工况，沟槽侧边掘削工况等，如何向各执行器供油，向那个执行器优先供油，如何按操作者的愿望实现理想的配油关系也是很困难的。还有作业装置同时动作时行走直线性等问题。

　　对于开中心油路光靠操纵多路阀阀杆来实现挖掘机作业动作要求是不行的。 为此设计师在开中心系统的设计上动足了脑筋，想了许多办法，采用了不少通断型二位二通阀和插装阀来改变供油，在油路上通过设置节流孔和节流阀来实现优先供油关系。但是可以这样说，采用了这些措施，开中心油路仍然是不理想的，仍不能满足挖掘机工作要求和理想的作业动作要求。

①沉割槽形节流口。主要用在液压系统滑阀式结构中，它的结构简单，具有理想的线性特性。阀口要采用线切割加工。由于存在径向间隙，全关闭时密封性不好，并且由于水力半径较小，小流量时易产生阻塞现象。

　　②锥阀形节流口。液压系统密封性好，制造简单、小流量的灵敏性好。其水力半径较小，小开口时易产生堵塞现象。

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