力士乐比例阀4WRVE 25 V250M-2X/G24K0/B5M 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WRL 25 V370M-3X/G24Z4/M
WRL 25 WZ350S-3X/G24Z4/M
WRL 25 EZ350S-3X/G24Z4/M
WRL 25 E1Z350S-3X/G24Z4/M
WRL 25 W1Z350S-3X/G24Z4/M
WRL 25 W350S-3X/G24Z4/WX02M-
WRL 25 V270M-3X/G24Z4/M-
WRL 25 W3-350S-3X/G24Z4/WX02M-
WRL 25 E4-350S-3X/G24Z4/M
WRL 25 W4-350S-3X/G24Z4/M
WRL 25 EZ350S-3X/G24Z4/M-
WRL 25 V1-370M-3X/G24K0/M-
WRL 25 EZ350S-3X/G24ETZ4/M-
WRL 25 E1-350S-3X/G24Z4/M-
WRL 25 V370M-3X/G24K0/M-
WRLEM 25 EZ350SJ-3X/G24K0/A1M
WRLE 25 V370M-3X/G24K0/A1M
WRLE 25 Q5-370M-3X/G24K0/A1M
WRLE 27 V430M-3X/G24K0/A1M
WRLE 25 X370M-3X/G24K0/A1M-
WRLE 25 X370M-3X/G24ETK0/A1M-
WRLE 25 X370M-3X/G24EK0/A1M-
WRLE 27 X430M-3X/G24K0/A1M-
WRLE 25 X370M-3X/G24K0/A1M-
WRLE 27 Q4-430M-3X/G24ETK0/A1M
WRLE 25 W1-370M-3X/G24EK0/A1M-
WRLE 27 W1-430M-3X/G24EK0/A1M-
WRLE 27 Q4-430M-3X/G24K0/A1M
WRLE 27 Q4-430M-3X/G24TK0/A1M
WRLE 27 W4-430SJ-3X/G24ETK0/A1WX02M-
WRLE 25 V1-370M-3X/G24K0/A1M
WRVE 25 V370M-2X/G24K0/B5M
WRVE 27 V430M-2X/G24K0/B5M
WRVE 25 V250M-2X/G24K0/B5M
WRLE 25 WZ350SJ-3X/G24EK0/A1M-
WRLE 25 WZ350SJ-3X/G24ETK0/A1WX02M-
WRLE 25 EZ350SJ-3X/G24K0/A1M
WRLE 25 E1Z350SJ-3X/G24K0/A1M
WRLE 25 WZ350SJ-3X/G24K0/A1M
WRLE 25 W1Z350SJ-3X/G24K0/A1M
WRLE 27 W430SJ-3X/G24K0/A1M
WRLE 25 E4-350SJ-3X/G24K0/A1M
WRLE 25 WZ350SJ-3X/G24K0/A1M-
WRLE 27 W430SJ-3X/G24K0/A1M-
WRLE 25 EZ350SJ-3X/G24TK0/A1M
WRLE 25 W3-350SJ-3X/G24EK0/A1WX02M-
WRLE 25 W3-350SJ-3X/G24EK0/A1WX02M-
WRLE 25 W4Z350SJ-3X/G24ETK0/A1M
WRLE 25 W4Z350SJ-3X/G24K0/A1M
WRLE 25 W350SJ-3X/G24EK0/A1WX02M-
WRLE 25 W350SJ-3X/G24EK0/A1WX02M-
WRLE 27 X430SJ-3X/G24EK0/A1WX02M-
WRLE 27 E430SJ-3X/G24K0/A1M
WRLE 27 W3-430SJ-3X/G24EK0/A1WX02M-
WRLE 25 WZ350SJ-3X/G24K0/A1M-
WRLE 25 EZ350SJ-3X/G24ETK0/A1M
WRLE 27 E4-430SJ-3X/G24K0/A1M
WRLE 25 WZ350SJ-3X/G24K0/A1V
WRL 25 EZ000S-3X/G24Z4/M-
WRLE 25 W4Z350SJ-3X/G24K0/A1M-
WRLE 27 W430SJ-3X/G24K0/A1M-
WRLE 35 W1100SJ-3X/G24K0/A1M-
WRL 25 V300P-3X/G24Z4/M
WRLE 25 V370M-3X/G24ETK0/A1M
WRL 35 E1100S-3X/G24Z4/M
WRL 35 W1100S-3X/G24Z4/WX02M-
WRLE 35 W1100SJ-3X/G24EK0/A1WX02M-
WRLE 35 W5-600SJ-3X/G24EK0/A1WX02M-
WRLE 35 W1100SJ-3X/G24K0/A1M
WRLE 35 W3-1100SJ-3X/G24EK0/A1WX02M-
WRL 35 W2-1100S-3X/G24Z4/M
WRLE 35 R5-1100SJ-3X/G24EK0/A1WX02M-
WRPH 6 C4 B02L-2X/G24Z4/M
WRPH 6 C3 B24L-2X/G24K0/M-
WRPEH 6 C1 B24L-2X/G24K0/F1M
WRPEH 6 C3 B02L-2X/G24K0/F1M
WRPEH 6 C B12L-2X/G24K0/A1M
WRPE 6 Q4-32M-2X/G24K0/A1M
WRPEH 6 C4 B02L-2X/G24K0/F1M
WRPEH 6 C3 B40L-2X/G24K0/A1V
WRPE 10 Q5-50M-2X/G24K0/A1M-
WRPE 10 V80M-2X/G24K0/A1M-
WRPE 10 R5-80P-2X/G24K0/A1M-
WRPE 10 R5-80P-2X/G24K0/A1M-
WRPE 10 Q4B50L-2X/G24K0/A1M
WRPE 10 Q5-80M-2X/G24K0/B5M-
WRPE 10 Q5-80M-2X/G24K0/B5M
WRPEH 10 C4 B50P-2X/G24K0/F1M
