DG5V-8-S-6C-T-M-U-H-10
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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。02-145185 DG4V3S8CVMFWH561EN21
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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高的。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。
型号 ALP2-D-20-EP
Marzocchi GHP2-D-9
GHPP3-S-66-D
ALPA3-D-80
GHPP3-S-33-D
ALPA4-D-160
意大利ALP1A-D-9-FG
型号 GHP2A-D-25-FG
双联齿轮泵 GHPA2-D-6+GHPP2-D-6
型号 GHP2A-D-25-FG
GHP1A-D-11-FG
GHP1A-D-11-FG
GHP1-D-11-FG
GHP3-D-40
MARZOCCHI型号:ALP2-D-9
GHPA3-S-110+GHPP3-S-110
GHPA3-S-110
GHPP3-S-110
齿轮泵GHP2-D-25
齿轮泵ALPC2A-D-20/20-S2-FG-FG
意大利GHPA1-D-6+GHPP1-D-6 4CC/R
液压马达型号:ALM2A-R-6-S1-FG-E1
MARZOCCHI液压泵 ALP2-D-25
高压齿轮泵GHPA1-D-6+GHPP1-D-6 4CC/R
GHP3 - S-110
MARZOCCHI型号:ALP2A-D-6-FC
泵 ALP3A-D-135-FA
油泵ALP2-S-40
齿轮泵 ALP3A-D-94-FA
GHP2-D-30-V齿轮泵
齿轮泵 IPD3.3GAS
泵 ALP2-D-16
ALP3-D-110-V
ALPA1-D-6
ALPA2A-D-20-FG+ALPP2-D-9-FG
ALPA2A-D-9-FG
ALPA2-D-20-FG
ALPA3-D-120
ALPP1-D-9-FG
GHP1-D-2
GHP2A-D-12
GHP2A-D-20-C1
GHP2A-D-25-FG
GHP2A-D-30-SI-V-TR
GHP2A-D-50-FG
GHP2A-D-6-FG
GHP2-D-10
GHP2-D-30V
GHP2-D-40V
GHP2-D-9
GHP2-S-9-FG
GHP3A-D-40-FG
GHP3-S-60-FG
GHPA1-D-9+GHPP1-D-4
GHPA3-S-94+GHPP3-S-94
GHPP3-D-33
GHPP3-D-66-D
ALPP2-D-25
ALP3A-D-50-S1-E
GHP3A-D-60-S1-FG
GHP2A-D-9-C1-FG
ALPP1-D-9-FG+ALPP1-D-9-FG
ALP4A-D-220
GHP2A-D-40-FG
ALP2BK7-S-9
ALP1A-D-11-C1-FG
ALP1A-D-7-C1-FG
ALP1A-D-7-FG
ALPA2-S-9+ALPP2-S-9
一般说来，好像伺服系统都是闭环控制，比例多用于开环控制；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！ R900912625 LFA16D-7X/F
R900942750 LFA16D-7X/FV
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R900951236 LFA16H2-7X/FV
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R901027525 LFA25R-7X/V
R900927301 LFA25RF-7X/