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　　③矩形节流口。相当于沉割槽形的部分开口形式，线性很好，密封性比沉割槽形的好。

　　④T形节流口。通过不同宽度的矩形节流口组合，可以达到大小流量时具有不同的阀口增益。在小开度下，阀口具有较大的水力半径，因此小流量稳定性好。其工艺性不够满意。

　　⑤轴向三角槽形节流口。阀芯做轴向移动时，就改变了通流面积的大小。这种节流口结构简单，工艺性好，水力直径中等，可得到较小的稳定流量，调节范围较大，由于几条三角沟槽沿圆周方向均匀分布，径向力相互平衡，故调节时所需的力也较小。这是一种目前应用很广的节流口结构。其节流通道有一定长度，油温变化对液压系统流量有一定影响。

　　⑥圆形节流口。圆形节流口开在轴套上，加工简单，阀芯做轴向移动时，改变阀的开度，小流量稳定性好，抗阻塞性好。其在高压工作时节流口易变化，并且起始段的特性欠佳，但开度较大时线性度尚可。为了改善起始段的调节性能，有时将它设计成类似T形的复合式阀口，在小开度时由狭方口起调节作用。

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