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，手机：18934630908    

询价传真：0713-6542758

询价QQ: 736567721,704552157

现货特价型号：4WEH16E7X/6HG24N9ETK4/B10  2台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。     MOOG  J761-004  
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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。力士乐Rexroth 2FR 比例流量阀
00915817 2FRE 10-4X/10LBK4M
00915825 2FRE 10-4X/16LBK4M
00915820 2FRE 10-4X/25LBK4M
00915815 2FRE 10-4X/50LBK4M
00915819 2FRE 16-4X/100LBK4M
00915814 2FRE 16-4X/160LBK4M
2FRE6 B-20/6QK4M   配套放大器
2FRE10-40/10LBK4       配套放大器
2FRE10-40/50LBK4          配套放大器
R900770641 2FRE 6 A-2X/1LK4MV     
R900960170 2FRE 6 A-2X/1LK4RV 
R900961336 2FRE 6 A-2X/2LK4MV     
R900245015 2FRE 6 A-2X/2LK4RV 
R900967793 2FRE 6 A-2X/8LK4MV   
  R900975322 2FRE 6 A-2X/8LK4RV 
R900950857 2FRE 6 A-2X/3QK4MV   
  R900937867 2FRE 6 A-2X/3QK4RV 
R900973053 2FRE 6 A-2X/6QK4MV  
   R900956195 2FRE 6 A-2X/6QK4RV 
R900937860 2FRE 6 A-2X/10QK4MV  
  R900937866 2FRE 6 A-2X/10QK4RV
R900937864 2FRE 6 A-2X/16QK4MV   
 R900958063 2FRE 6 A-2X/16QK4RV 
R900937865 2FRE 6 A-2X/25QK4MV   
 R900937883 2FRE 6 A-2X/25QK4RV
R900960182 2FRE 6 A-2X/2QEK4MV    
R900962992 2FRE 6 A-2X/2QEK4RV 
R900937868 2FRE 6 B-2X/1LK4MV  
   R900947600 2FRE 6 B-2X/1LK4RV 
R900936635 2FRE 6 B-2X/2LK4MV     
R900934891 2FRE 6 B-2X/2LK4RV 
R900937874 2FRE 6 B-2X/8LK4MV   
  R900934070 2FRE 6 B-2X/8LK4RV 
R900933708 2FRE 6 B-2X/3QK4MV 
    R900937872 2FRE 6 B-2X/3QK4RV 
R900937873 2FRE 6 B-2X/6QK4MV  
   R900949742 2FRE 6 B-2X/6QK4RV 力士乐Rexroth
R900937869 2FRE 6 B-2X/10QK4MV   
 R900949563 2FRE 6 B-2X/10QK4RV 
R900936636 2FRE 6 B-2X/16QK4MV  
  R900949741 2FRE 6 B-2X/16QK4RV 力士乐Rexroth
R900937870 2FRE 6 B-2X/25QK4MV 
   R900937871 2FRE 6 B-2X/25QK4RV 
R900938035 2FRE 6 B-2X/2QEK4MV  
  R900954501 2FRE 6 B-2X/2QEK4RV 力士乐Rexroth
R900915817 2FRE 10-4X/10LBK4M  
   R900785983 2FRE 10-4X/10LBK4V 
R900915825 2FRE 10-4X/16LBK4M  
   R900760386 2FRE 10-4X/16LBK4V 力士乐Rexroth
R900915820 2FRE 10-4X/25LBK4M    
 R900249888 2FRE 10-4X/25LBK4V 
R900915815 2FRE 10-4X/50LBK4M  
   R901021448 2FRE 10-4X/50LBK4V 力士乐Rexroth
R900915823 2FRE 10-4X/60LBK4M  
   R900976616 2FRE 10-4X/60LBK4V 
R900964806 2FRE 10-4X/5QEBK4M   

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！0811404145 4WRPE6W08SJ-2X/G24KO/A1M
0811404147 4WRPE6W32SJ-2X/G24KO/F1M
0811404160 4WRPH6C4B04L-2X/G24Z4/M
0811044162 4WRPH6C1B40P-2X/G24Z4M
0811404163 4WRPH6XB24L-2X/G24Z4/M-842
0811404166 4WRPH6XB12L-2X/G24Z4/M-842
0811404172 4WRPH6CB25P-2X/G24Z4/M
0811404175 4WRPH6XB4OL-2X/G24Z4/M-842
0811404177 4WRPH6XB12L-2X/G24KO/M-843
0811404180 4WRL10E80S-3X/G24Z4/M
0811404181 4WRL10E1-80S-3X/G24Z4/M
0811404182 4WRL10E1-80S-3X/G24ETZ4/M
0811404183 4WRL10W80S-3X/G24Z4/M
0811404184 4WRL10W1-80S-3X/G24Z4/M
0811404185 4WRL10W1-80S-3X/G24ETZ4/M
0811404186 4WRL10E4-80S-3X/G24Z4/M
0811404187 4WRL10W4-80S-3X/G24Z4/M
0811404188 4WRL10W80S-3X/G24ETZ4/M
0811404189 4WRL10E80S-3X/G24TZ4/M
0811404190 4WRL10E1-80S-3X/G24TZ4/M
0811404206 4WRL16V120M-3X/G24Z4/M
0811404207 4WRL16V200M-3X/G24Z4/M
0811404209 4WRL16WZ180S-3X/G24Z4/M
0811404210 4WRL16EZ180S-3X/G24Z4/M
0811404211 4WRL16W4-180S-3X/G24Z4/M
0811404212 4WRL16E1Z180S-3X/G24Z4/M
0811404213 4WRL16W1Z180S-3X/G24Z4/M
0811404214 4WRL16E4-180S-3X/G24Z4/M
0811404215 4WRL16E110S-3X/G24Z4/M
0811404216 4WRL16E1-110S-3X/G24Z4/M
0811404217 4WRL16W180S-3X/G24EZ4/M
0811404250 4WRLE16V120M-3X/G24KO/A1M
0811404251 4WRLE16V200M-3X/G24KO/A1M
0811404252 4WRLE16Q5200M-3X/G24KO/A1M
0811404269 4WRLE16V200M-3X/G24KO/B5M
0811404270 4WRLE16Q4-200M-3X/G24ETKO/A1M
0811404271 4WRLE16V120M-3X/G24KO/B5M
0811404272 4WRLE16V200M-3X/G24KO/F1M
0811404275 4WRLE16Q4-200M-3X/G24TKO/A1M
0811404276 4WRLE16Q4-200M-3X/G24KO/A1M
0811404290 4WRVE16V120M-2X/G24KO/B5M
0811404291 4WRVE16V200M-2X/G24KO/B5M
0811404300 4WRLE16W180SJ-3X/G24EKO/A1M
0811404305 4WRLE16EZ180SJ-3X/G24KO/A1M
0811404306 4WRLE16E1Z180SJ-3X/G24KO/A1M
0811404307 4WRLE16WZ180SJ-3X/G24KO/A1M
0811404308 4WRLE16W1Z180SJ-3X/G24KO/A1M
0811404317 4WRLE16W2-180SJ-3X/G24KO/A1M
0811404318 4WRLE16EZ180SJ-3X/G24TKO/A1M
0811404319 4WRLE16EZ180SJ-3X/G24ETKO/A1M
0811404320 4WRLE16W5-180SJ-3X/G24KO/A1M
0811404325 4WRLE16WA110SJ-3X/G24KO/A1M
0811404327 4WRLE16W1Z180SJ-3X/G24ETKO/A1M
0811404328 4WRLE16W4-180SJ-3X/G24ETKO/A1M
0811404329 4WRLE16WA180SJ-3X/G24KO/A1M
0811404390 4WRL10V85M-3X/G24ETZ4/M
0811404405 4WRL25V370M-3X/G24Z4/M
0811404406 4WRL25WZ350S-3X/G24Z4/M
0811404407 4WRL25EZ350S-3X/G24Z4/M
0811404408 4WRL25E1Z350S-3X/G24Z4/M
0811404409 4WRL25W1Z350S-3X/G24Z4/M
0811404420 4WRL25E4-350S-3X/G24Z4/M
0811404421 4WRL25W4-350S-3X/G24Z4/M
0811404429 4WRLEM25EZ350SJ-3X/G24KO/A1M
0811404430 4WRLE25V370M-3X/G24KO/A1M
0811404431 4WRLE25Q5-370M-3X/G24KO/A1M
0811404432 4WRLE27V430M-3X/G24KO/A1M
0811404438 4WRLE27Q4-430M-3X/G24ETKO/A1M
0811404441 4WRLE27Q4-430M-3X/G24KO/A1M
0811404442 4WRLE27Q4-430M-3X/G24TKO/A1M
0811404445 4WRVE25V370M-2X/G24KO/B5M
0811404454 4WRLE25EZ350SJ-3X/G24KO/A1M
0811404455 4WRLE25E1Z350SJ-3X/G24KO/A1M
0811404456 4WRLE25WZ350SJ-3X/G24KO/A1M
0811404457 4WRLE25W1Z350SJ-3X/G24KO/A1M
0811404458 4WRLE27W430SJ-3X/G24KO/A1M
0811404466 4WRLE25EZ350SJ-3X/G24TKO/A1M

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VT-VSPA2-1-1X/ 
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VT11024-1X/   
VT-VRPD-1-1X/V0/0 
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VT-PVPQ1-1X/0 
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VT16000-2X/ 
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VT5004-2X/R5E   
VT11037-1X/ 
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VT1600-3X/1E   
VT11132-1X/ 
VT13477-2X/3   
VT11550-2X/-VT11554-2X/ 
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VT11165-1X/ 
VT11078-2X   
VT-MRPA2-1-1X 
VT11023-1X 
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VT-MSPA1-1-1X/V0/0
VT-MSPA1-1-1X/ 
VT-VSPA1-2-1X/V0/0
VT-SWMA-1-1X/ VT5003