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比例控制技术在液压系统中的应用越来越广泛，比例方向阀调节执行元件速度时，与压力补偿器配合使用，其优点可使比例阀阀口越来差基本保持不变，从而使执行元件的速度不受负载变化的影响。目前，压力补偿器已广泛应用于冶金、电力、建筑、煤矿机械等各个行业。
比例控制技术是在开关控制技术和伺服控制技术之间的过度技术，采用比例放大器控制比例电磁铁，实现对比例阀的连续控制，从而实现对液压系统压力、流量、方向的无级调节；但是用比例阀进行速度控制时，如果负载是变化的，那么执行元件的速度就会受负载变化的影响，负载小时速度快，负载大时速度慢，于是在系统设计时，人们引用了压力补偿器，它可以使比例阀阀口的压差保持恒定，使执行元件的速度不受负载变化的影响。
放大器采用简单的放大原理，或将发送端信号放大，或将接收端已经衰减的信号放大。在接收端放大的方式一出来就被抛弃，因为他会将传输中的干扰一起放大，包括内部信号间的串扰。采用发送端放大的设备在采用特制VGA视频线缆为传输介质后，可以将电脑的VGA视频信号传输上几十米。
比例电磁铁为了输出克服弹簧力和液动力，必须要有足够的电流，不同的厂家的比例电磁铁，大位移所需的电流值通常在600-3000mA不等,而工业控制标准信号通常是0-5v/0-10v/-5-+5v/-10-+10v的电压信号或0-20mA/4-20mA电流信号，控制信号带负载能力很弱，不足以推动比例电磁铁。比例阀放大器起到一个信号匹配的作用，接收微弱的控制信号，输出比例电磁铁所需的电流，同时比例阀放大器加入了各种必要的环节，如死区调整/增益调整/斜坡时间/颤振调节等。总之，比例阀放大器就是一个信号匹配器。
REXROTH放大板VT11118-11
力士乐REXROTH模拟电路放大板模块，欧洲版制式
0811405126 VT-MSPA1-508-10/V0
0811405127 VT-MSPA1-525-10/V0
0811405106 VT-MSPA2-525-10/V0
R901439037 VT-MSPA2-2X/A5/000/000
R901439037 VT-MSPA2-20/A5/000/000
R900702060 VT-MSPA1-1-1X/V0/0
R901142355 VT-MSPA1-10-1X/V0
R901142360 VT-MSPA1-11-1X/V0/0
R901288145 VT-MSPA1-30-1X/V0/0
R901288142 VT-MSPA1-150-1X/V0/0
R901142366 VT-MSPA1-200-1X/V0/0
R900249810 VT-MSPA1-50-1X/V0
R901439034 VT-MSPA1-2X/A5/000/000
R901439034 VT-MSPA1-20/A5/000/000
R901054016 VT-MSPA1-50-1X/V001
R901010980 VT-MSPA2-1-1X/V0/0
R901226865 VT-MSPA2-1-1X/V002/0 FüR PRüFSTAND EIV11
R901348140 VT-MSPA2-1-1X=V0/0
R901061664 VT-MSPA2-200-1X/V0/0
R900537344 VT11131-1X/
R900030647 VT11132-1X/
R900010960 VT11013-10
R900211788 VT11118-1X/
R900211788 VT11118-10
R900211788 VT11118-11
R901280829 VT11118-1X=
R900010938 VT11015-1X/
R900010938 VT11015-11
R900019681 VT11017-1X/
R900019681 VT11017-11
R901463732 SERVO-AMPLIFIER AN422V05-08-0-1
R901197784 VT-MSRA1-1-1X/V0/0
R901386328 VT-MSRA1-1-1X/V001
力士乐REXROTH数字放大板，欧洲版制式
R901077297 VT-VSPD-1-2X/V0/0-0-1
R901161533 VT-VSPD-1-2X/V0/1-0-1
力士乐REXROTH具有电位置反馈的比例阀的阀放大器
力士乐REXROTH模拟放大板模块
R900752430 VT-MRMA1-1-1X/V0/0
R900779644 VT-MRPA1-100-1X/V0/0
R901080965 VT-MRPA1-150-1X/V0/0
R901080966 VT-MRPA1-151-1X/V0/0
R901416700 VT-MRPA1-151-1X=V0/0
R901094750 VT-MRPA1-1-1X/V0/0
R901094751 VT-MRPA1-2-1X/V0/0
R900249895 VT-MRPA2-1-1X/V0/0
R900249811 VT-MRPA2-2-1X/V0/0
力士乐REXROTH模拟电路放大板，欧洲版制式
0811405095 VT-VRPA1-527-10/V0
0811405096 VT-VRPA1-527-10/V0/PV
0811405098 VT-VRPA1-527-10/V0/QV
0811405097 VT-VRPA1-537-10/V0/PV
0811405099 VT-VRPA1-537-10/V0/QV
0811405101 VT-VRPA1-527-10/V0/PV-RTP
0811405103 VT-VRPA1-527-10/V0/QV-RTP
0811405100 VT-VRPA1-527-10/V0/RTP
0811405102 VT-VRPA1-537-10/V0/PV-RTP
0811405104 VT-VRPA1-537-10/V0/QV-RTP
0811405074 VT-VRPA1-527-20/V0/RTS-2/2V
R978022097 VT-VRPA1-100-1X/SO43A-466B
R901009038 VT-VRPA1-100-1X/V0/0
R901057058 VT-VRPA1-150-1X/V0/0
R901057060 VT-VRPA1-151-1X/V0/0
R901057060 VT-VRPA1-151-11/V0/0
R901057060 VT-VRPA1-151-12/V0/0
R900952202 VT-VRPA1-50-1X/
R900619297 VT-VRPA1-50-1X/001 FEDERLEIST 32POLIG F
R978911504 VT-VRPA1-50-1X/SO43A-472B
R900952204 VT-VRPA1-51-1X/
R979810986 VT-VRPA1-51-1X/ SO41-7519
R978031853 VT-VRPA1-51-1X/SO43A-1828
R900952205 VT-VRPA1-52-1X/
R900979887 VT-VRPA2-1-1X/V0/T1
R900979887 VT-VRPA2-1-11/V0/T1
R900979887 VT-VRPA2-1-12/V0/T1
R900979885 VT-VRPA2-1-1X/V0/T5
R900979885 VT-VRPA2-1-11/V0/T5
R900979889 VT-VRPA2-2-1X/V0/T1
R900979888 VT-VRPA2-2-1X/V0/T5
R900067617 VT-VRM1-1-1X/
力士乐REXROTH数字放大板，欧洲版制式
R901066987 VT-VRPD-2-2X/V0/0-0-1
力士乐REXROTH用于调节轴向柱塞泵流量的比例阀的阀放大器
R910908873 ROUND BAR VT 5035 S13/R5
R900579497 VT5035-1X/
R900579497 VT5035-17
R900010926 VT5035S1X/R5
R978910921 VT5035-1X/SO43A-1631
R978034109 VT5035-1X/SO43A-1830
R901271027 VT-SR7-10/1NG500HS/VT13243
R900553971 VT-SR7-1X/0/A4VBV450HS
R900035095 VT-SR7-1X/0/A4VS.125HS
R900935936 VT-SR7-1X/0/A4VS.125HS
R978918867 VT-SR7-1X/0/A4VS.180HSSO43A-1608
R900035593 VT-SR7-1X/0/A4VS.250HS
R978917126 VT-SR7-1X/0/A4VS.250HSSO43A-1608
R900035612 VT-SR7-1X/0/A4VS.355HS
R900030717 VT-SR7-1X/0/A4VS.500HS
R978015962 VT-SR7-1X/0/A4VS.500HSSO43A-1608
R978915908 VT-SR7-1X/0/A4VS.500HSSO43A-1670
R978026931 VT-SR7-1X/0/EFF00270
R901162573 VT-SR7-1X/1/A4VS.1000HS
R900559948 VT-SR7-1X/1/A4VS.125HS
R900557769 VT-SR7-1X/1/A4VS.180HS
R900029274 VT-SR7-1X/1/A4VS.250HS
R900904507 VT-SR7-1X/1/A4VS.250HS1
R900579280 VT-SR7-1X/1/A4VS.355HS
R900020743 VT-SR7-1X/1/A4VS.40HS
R900029181 VT-SR7-1X/1/A4VS.500HS
R901211008 VT-SR7-1X/1/A4VS.71DS/VT12431A/U144
R900020742 VT-SR7-1X/1/A4VS.71HS
R900903708 VT-SR7-1X/1/A4VS.750HS
R987163695 VT-SR7-1X/A4VS.250HSSO026-693
R978056876 VT-SR7-1X/EFF00330
力士乐REXROTHA4VS变量柱塞泵和A2V轴向柱塞泵与EO4变量轴向柱塞泵数字闭环控制电子放大板
R901187694 VT-VPCD-1-1X/V0/0-P-1
R901044346 VT-VPCD-1-1X/V0/1-0-1
R902650966 VT-VPCD-1-1X/V0/1-0-1RD30028
R901102344 VT-VPCD-1-1X/V0/1-C-1
R901102347 VT-VPCD-1-1X/V0/1-D-1
R901089559 VT-VPCD-1-1X/V0/1-P-1
R901026242 VT-VPCD-1-1X/V1/1-0-1
R901066773 VT-VPCD-1-1X/V1/1-C-1
R901078493 VT-VPCD-1-1X/V100/1-0-1
R901102342 VT-VPCD-1-1X/V100/1-C-1
R901102343 VT-VPCD-1-1X/V100/1-D-1
R901102341 VT-VPCD-1-1X/V100/1-P-1
R901130305 VT-VPCD-1-1X/V101/1-0-1
R901202729 VT-VPCD-1-1X/V2/1-0-1
R901415510 VT-VPCD-1-1X=V0/1-0-1
力士乐REXROTH高响应阀的阀用放大板
力士乐REXROTH模拟电路放大板，欧洲版制式
0811405137 VT-VRPA2-527-10/V0/RTS
0811405138 VT-VRPA2-537-10/V0/RTS
0811405119 VT-VRPA2-527-10/V0/RTP
0811405120 VT-VRPA2-537-10/V0/RTP
0811405123 VT-VRRA 1-527-10/V0
0811405148 VT-VRRA 1-527-10/V0/RV
0811405032 VT-VRRA1-527-20/V0
0811405060 VT-VRRA1-527-20/V0
R901205756 VT-VRRA1-527-2X/V001
R901430294 VT-VRRA1-527-2X/V002
0811405061 VT-VRRA1-537-20/V0
0811405065 VT-VRRA1-527-20/V0/K40-AGC
0811405066 VT-VRRA1-527-20/V0/K60-AGC
0811405067 VT-VRRA1-537-20/V0/K40-AGC
0811405069 VT-VRRA1-527-20/V0/KV-AGC
0811405070 VT-VRRA1-537-20/V0/KV-AGC
0811405069 VT-VRRA1-527-20/V0/KV-AGC
0811405070 VT-VRRA1-537-20/V0/KV-AGC
0811405063 VT-VRRA1-527-20/V0/2STV
0811405064 VT-VRRA1-527-20/V0/PO-IS
0811405068 VT-VRRA1-527-20/V0/K40-AGC-2STV
0811405083 VT-KRRA2-527-20/V0/2CH
0811405082 VT-KRRA2-537-20/V0/
0811405073 VT-VRPA1-527-20/V0/RTS-2STV
0811405076 VT-VRPA1-527-20/V0/2/2V
0811405062 VT-VRPA1-537-20/V0
R900903726 VT-SR31-1X/1-2(2WRC32)
R978057614 VT-SR31-1X/1-2/ES43A8-15793/P12
R900031529 VT-SR32-1X/1-2(2WRC40)
R978057615 VT-SR32-1X/1-2/ES43A8-15793/C12
R900903732 VT-SR33-1X/1-2(2WRC50)
R900034725 VT-SR34-1X/1-2(2WRC63)
R978057616 VT-SR34-1X/1-2/ES43A8-15793/C11
R900903748 VT-SR34-1X/1-3(3WRC63)
R900903731 VT-SR35-1X/1-2(2WRC80)
R900903750 VT-SR35-1X/1-3(3WRC80)
R900903734 VT-SR36-1X/1-2(2WRC100)
R900553460 VT-SR37-1X/1-2(2WRC125)
R900903737 VT-SR38-1X/1-2(2WRC160)
R900903754 VT-SR38-1X/1-3(3WRC160)
R900770000 VT-SR41-1X/1-2WRC32-2X
R900770001 VT-SR41-1X/1-3WRC32-2X
R900770002 VT-SR42-1X/1-2WRC40-2X
R900770003 VT-SR42-1X/1-3WRC40-2X
R901285449 VT-SR43-1X/0-2WRC50-2X
R900770004 VT-SR43-1X/1-2WRC50-2X
R900770006 VT-SR43-1X/1-3WRC50-2X
力士乐REXROTH伺服阀的阀放大板
力士乐REXROTH模拟放大器模块
R900019567 VT11021-1X/
R901167581 VT11021-1X/V001
R901272388 VT11021-1X/V002
R901335573 VT11021-1X=
力士乐REXROTH模拟电路放大板，欧洲版制式
R900930246 VT-SR1-1X/0/001