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比例阀
阀对流量的控制可以分为两种：
一种是开关控制：要么全开、要么全关，流量要么最da、要么最小，没有中间状态，如普通的电磁直通阀、电磁换向阀、电液换向阀。
另一种是连续控制：阀口可以根据需要打开任意一个开度，由此控制通过流量的大小，这类阀有手动控制的，如节流阀，也有电控的，如比例阀、伺服阀。
所以使用比例阀或伺服阀的目的就是：以电控方式实现对流量的节流控制（当然经过结构上的改动也可实现压力控制等），既然是节流控制，就必然有能量损失，伺服阀和其它阀不同的是，它的能量损失更大一些，因为它需要一定的流量来维持前置级控制油路的工作伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀就不能输出足够的压力来推动主阀芯动作。
而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力=t口压力+阀口压力损失（忽略油路上的其它压力损失），如果阀口压力损失很小，t口压力又为零，那么p口的压力就不足以供给前置级阀来推动主阀芯，整个伺服阀就失效了。所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。
伺服阀其实缺点极多：能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等，好处只有一个：动态性能是所有液压阀中最gao的。就凭着这一个优点，在很多对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的，基本上都是比例阀的天下了。
一般说来，好像伺服系统都是闭环控制，比例阀多用于开环控制；其次比例阀类型要多，有比例压力、流量控制阀等，控制比伺服要灵活一些。从他们内部结构看，伺服阀多是零遮盖，比例阀则有一定的死区，控制精度要低，响应要慢。但从发展趋势看，特别在比例方向流量控制阀和伺服阀方面，两者性能差别逐渐在缩小，另外比例阀的成本比伺服阀要低许多，抗污染能力也强！伺服阀与比例阀的区别
伺服阀与比例阀之间的差别并没有严格的规定，因为比例阀的性能越来越好，逐渐向伺服阀靠近，所以近些年出现了比例伺服阀。
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力士乐单向节流阀
DRVP10-10/2 ，DR20-5-52/200YM，ZDR10DP1-5X/150YM ，ZDR6DP1-5X/210Y，ZDR6DP2-4X/150YM ，DR20-5-5X/100Y，ZDR10VP5-3X/200YM， ZDR6DP1-4X/210YM，ZDR10DA1-5X/150Y，ZDR10DP1-5X/150YM，ZDR6DA2-4X/150Y，ZDR6DP1-4X/150YM，ZDR6DP2-4X/150YM ，DR20-5-5X/200YM，ZDR6DP0-45/40YMVW80 ZDR6DP2-5X/315YM ，ZDR6DA2-4X/150Y ，DR10-5-52/100YM -，ZDR 10DP1-54/150YM ，
DR20-4-5X/315Y，DR10DP2-4X/210YM ，DR10-5-5X/200YM ，DR20-5-5X/315YM， ZDR6DA1-4X/75Y，DR10-1-30B/315YM ，DR20-5-5X/315YM ,ZDR6DP0-5/40YMVW80，ZDR6DP2-5X/315YM，
ZDR6DA2-4X/150Y ，DR10-5-52/100YM，3DREM10P5-6X/100Y/OOM ，3DREM10P6X/315YG24K4V-1，
FDR5DP1/55YS037,FDR5DP1-1X/55YS037,DR10-4-43/100Y，DR20-5-5X/200YMV， DR30-5-5X/200YV， DR10-4-43/100Y，DR20-5-5X/200YMV，DR30-5-5X/200YV，ZDR10DA2-X/210YV， ZDR10DP1-5X/150YM，ZDR10-DP2-52/75Y，ZDR10DP2-5X/150YM，ZDR10DP2-5X/210YMV，
ZDR10VP5-3X/200YMV， ZDR10VP5-3X/315MV， ZDR10VP6-3X/200YV， ZDR6DA2-4X/150YV
ZDR6DP1-4X/75YM，ZDR6DP2-4X/150YM， ZDR6DP2-4X/210YM， ZDR6DP2-4X/210YM，
DRV10-01-X/0， DR6DP2-5X/75YM3，ZDR6DP2-4X/210YM，3DREP6C-14/25A24N9K4M，DR30-5-5X/315Y，
3DREPE6C-2X/25EG24K31/F1M-00， ZDR10DP2-40/210ron，FDR5DP1-13/55YS037，
ZDR6DA34X/25Y，FDR5DP1-1X/55YS037，FDR5DP1-1X/55YSO37CORE，ZDR6DA1-4X/210Y，
3DREP6C-11/25AG24NZ4M，DR10DP2-4X/210YM，ZDR10DP1-40/10YM，ZDR6DP2-4X/75YM
ZDR1ODP2-4X/150YMV，3DREP6C-11/25AG24NZ4M，DR10DP2-4X/210YM，DR6DP2-50/75YM，
ZDR6DP2-43/150YM，DR6DP2-5X/210YM ，DR30-5-5X/315Y，DR20-5-5X/315YU
DR10D-5-5X/200Y，ZDR10DA2-4X/150Y， ZDR6DA2-4X/150Y，DR20-5-5X/315YM，DR20-5-5X/315YM，DREM30-4X/315YG24，DREM30-4X/100YMG2 ，DREM20-5X/315YMG2，FDR5DPI-14/55Y，
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DREM10-5X/200YMG2，DRE6-1X/210MG24K4，DREM10-5X/315YG24，DREM10-5X/315YG24,
DRE10-5X/315YG24K ，DRE10-5X/200YMG24，DRE10-5X/20，FDR5DP1-14/55Y
DR20-5-5X/315Y，ZDR10DP2-4-5X/210YM， FDR5DP1-1X/55Y SO37 ，FDR5DP1-1X/55YSO37，
DR20-5-5X/315YM，ZDR10DP2-4-5X/210YM， FDR5DP1-1X/55Y SO37，
ZDR16DP/210Y ，ZDR10DA/210Y， ZDR6DA1/210Y，ZDR10DP1-5X/150YM ，ZDR6DP1-5X/210Y，
ZDR6DP2-4X/150YM ，ZDR10VP5-3X/200YM ，ZDR6DP1-4X/210YM， ZDR10DA1-5X/150Y，
ZDR10DP1-5X/150YM ，ZDR6DA2-4X/150Y， ZDR6DP1-4X/150YM，ZDR6DP2-X/150YM ，
ZDR6DP0-45/40YMVW80 ，ZDR6DP2-5X/315YM ，ZDR6DA2-4X/150Y ，DR6DP2-5X/75YM3，ZDR6DP2-4X/210YM
