武穴黎翔机电设备有限公司，询价联系人：何女士

询价电话：0713-6542758，18934630908    

询价传真：0713-6542758

询价QQ: 736567721,704552157

R900925687 4WRAE10W1-30-22/G24N9K31/F1V

0811402141 DBETBEX-1X/315G24K31F1M

D634-371C R24K02MONSS2 

　　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，

，GHM1A-R-6-E1，GHM1A-R-7-E1，GHM1A-R-9-E1， 
GHM1A-R-11-E1，GHM1A-R-13-E1，GHM1A-R-16-E1，GHM1AQ-R-4-E1， 
GHM1AQ-R-5-E1，GHM1AQ-R-6-E1，GHM1AQ-R-7-E1，GHM1AQ-R-9-E1， 
GHM1AQ-R-11-E1，GHM1AQ-R-13-E1，GHM1AQ-R-16-E1，GHM2-R-6-E1， 
GHM2-R-9-E1，GHM2-R-10-E1，GHM2-R-12-E1，GHM2-R-13-E1，GHM2- 
R-16-E1，GHM2-R-20-E1，GHM2-R-22-E1，GHM2-R-25-E1，GHM2-R-30- 
E1，GHM2-R-34-E1，GHM2-R-37-E1，GHM2-R-40-E1，GHM2A-R-6-E1， 
GHM2A-R-9-E1，GHM2A-R-10-E1，GHM2A-R-12-E1，GHM2A-R-13-E1， 
GHM2A-R-16-E1，GHM2A-R-20-E1，GHM2A-R-22-E1，GHM2A-R-25-E1， 
GHM2A-R-30-E1，GHM2A-R-34-E1，GHM2A-R-37-E1，GHM2A-R-40-E1， 
GHM2A3-R-6-E1，GHM2A3-R-9-E1，GHM2A3-R-10-E1，GHM2A3-R-12-E1 
，GHM2A3-R-13-E1，GHM2A3-R-16-E1，GHM2A3-R-20-E1，GHM2A3-R- 
22-E1，GHM2A3-R-25-E1，GHM2A3-R-30-E1，GHM2A3-R-34-E1， 
GHM2A3-R-37-E1，GHM2A3-R-40-E1，GHM3-R-33-E1，GHM3-R-40-E1， 
GHM3-R-50-E1，GHM3-R-60-E1，GHM3-R-66-E1，GHM3-R-80-E1，GHM3 
-R-94-E1，GHM3-R-110-E1，GHM3-R-120-E1，GHM3-R-135-E1，
GHM3A-R-33-E1，GHM3A-R-40-E1，GHM3A-R-50-E1，GHM3A-R-60-E1， 
GHM3A-R-66-E1，GHM3A-R-80-E1，GHM3A-R-94-E1，GHM3A-R-110-E1， 
GHM3A-R-120-E1，GHM3A-R-135-E1，GHM3A2-R-33-E1，GHM3A2-R-40- 
E1，GHM3A2-R-50-E1，GHM3A2-R-60-E1，GHM3A2-R-66-E1，GHM3A2- 
R-80-E1，GHM3A2-R-94-E1，GHM3A2-R-110-E1，GHM3A2-R-120-E1， 
GHM3A2-R-135-E1，

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。

GHP2A-D-13-FG，GHP2A-D-16-FG，GHP2A-D-20-FG，GHP2A-D-22-FG，GHP2A-D-25-FG，
GHP2A-D-30-FG，GHP2A-D-34-FG，GHP2A-D-40-FG，GHP3A-D-30-FG，GHP3A-D-33-FG，
GHP3A-D-40-FG，GHP3A-D-50-FG，GHP3A-D-60-FG，GHP3A-D-66-FG，GHP3A-D-80-FG，
GHP3A-D-94-FG，GHP3A-D-110-FG，GHP3A-D-120-FG，GHP3A-D-135-FG，ALP1A，ALP2A，ALP3A，ALM1，ALM2，ALM3，GHM1A，GHM2A，GHM3A，GHP1A，GHP2A，
GHP3A，
1PD7.5；ALP2D6；ALP2D20；2BR，0.25D18，AA2，1PD6.7，3M80AC，ALP2D22，GHP2A-D-34；1PD11.5，GHP3-D-40，GHP3-D-3，GHP1-D-6GHP2-S-13，LK1PD9.2G，PD3D50+2D16，PD3D50+2D20，PD3D30+2D13，ALP2A-D-30，ALP2A-D-40，ALP2-D-16-CO-FG，ALP2-D-16-FG；ALP2-D-22-CO，KLPD6.7G，ALP2-D-6，ALP2A-D-16，ALP2A-D-34，ALP2A-D-9，ALP2-D-22，ALP1-D-11，ALP2-D-20，ALP2-D-30；
ALP2BK1-D-6，ALP2BK1-D-9，ALP2BK1-D-10，ALP2BK1-D-12，ALP2BK1-D-13，ALP2BK1-D-16，ALP2BK1-D-20，ALP2BK1-D-22，ALP2BK1-D-25，ALP2BK1-D-30，ALP2BK1-D-34，ALP2BK1-D-37，ALP2BK1-D-40，ALP2BK2-D-6，ALP2BK2-D-9，ALP2BK2-D-10，ALP2BK2-D-12，ALP2BK2-D-13，ALP2BK2-D-16，ALP2BK2-D-20，ALP2BK2-D-22，ALP2BK2-D-25，ALP2BK2-D-30，ALP2BK2-D-34，ALP2BK2-D-37，ALP2BK2-D-40，ALP2BK4-D-6，ALP2BK4-D-9，ALP2BK4-D-10，ALP2BK4-D-12，ALP2BK4-D-13，ALP2BK4-D-16，ALP2BK4-D-20，ALP2BK4-D-22，ALP2BK4-D-25，ALP2BK4-D-30，ALP2BK4-D-34，ALP2BK4-D-37，ALP2BK4-D-40，ALP2BK7-D-6，ALP2BK7-D-9，ALP2BK7-D-10，ALP2BK7-D-12，ALP2BK7-D-13，ALP2BK7-D-16，ALP2BK7-D-20，ALP2BK7-D-22，ALP2BK7-D-25，ALP2BK7-D-30，ALP2BK7-D-34，ALP2BK7-D-37，ALP2BK7-D-40，ALP3-D-30，ALP3-D-33，ALP3-D-40，ALP3-D-50，ALP3-D-60，ALP3-D-66，ALP3-D-80，ALP3-D-94，ALP3-D-110，ALP3-D-120，ALP3-D-135，
ALP3A-D-30，ALP3A-D-33，ALP3A-D-40，ALP3A-D-50，ALP3A-D-60，ALP3A-D-66，ALP3A-D-80，ALP3A-D-94，ALP3A-D-110，ALP3A-D-120，ALP3A-D-135，ALP4-D-130，ALP4-D-160，ALP4-D-190，ALP4-D-220，ALP4-D-250，ALP4-D-270，ALP4-D-300，

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。

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