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液压比例控制系统
以比例控制元件完成动力与运动方向控制，分为比例压力阀、比例流量阀、比例方向阀及比例方向流量阀，可为模拟量输入或数字量输入，视是否带反馈分为开环控制与闭环控制，一般获得频率不是很高(10HZ)以内，高频响阀可实现较高频率。
若精度要求不高可考虑使用电液比例控制系统，一般电液比例控制系统可达至以下精度
位置精度- 3 mm
速度精度带压力补偿器- 3%
加减速斜坡时间-0.5秒
压力带位移传感器的产品-比例压力阀设定的0.3% (如压力设定为200bar,精度可达0.6bar)
一般的多驱动器液压系统皆要求流量及压力控制，提供比例压力及流量控制系统
开环式比例压力及流量控制可用于定量泵及变量泵系统。
速度和流量比例控制的分别是:
流量控制只控制供油量,并不控制驱动元件的运动方向;
若系统负载及变速要求高，则要使用速度控制系统。
速度比例控制多用于自动化控制、注塑机、压力机等
使用闭环的主要原因:
保持设定值不受外来干扰所影响
→在不同的工作压力下保持稳定的速度
→在不同的输出力下保证相同位置
→在带偏载的情况下作同步移动
提高精度要求
→位置误差低于1 mm
→压力误差低于1 ba
→需要控制加减速度
高动态要求的系统
→模拟应用
→测验应用


液压伺服控制系统
以伺服控制元件完成动力与运动方向控制，综合压力、流量、方向控制为一体，利用偏差控制进行纠偏，以满足精度控制需要，必须为闭环控制，可实现较高频率( 100HZ以上) ,有滑阀式、喷嘴挡板式、射流管式等，常采用机械伺服、电液伺服、气液伺服。

液压伺服系统分类:
(1)按输入的信号变化规律分类:定值控制系统、程序控制系统和伺服系统三类。当系统输入信号为定值时，称为定值控制系统，其基本任务是提高系统的抗干扰能力。当系统的输入信号按预先给定的规律变化时，称为程序控制系统。伺服系统也称为随动系统，其输入信号是时间的未知函数，输出量能够准确、迅速地复现输入量的变化规律。
(2)按输入信号的不同分类:机液伺服系统、电液伺服系统、气液伺服系统等。
(3)按输出的物理量分类:位置伺服系统、速度伺服系统、力(或压力)伺服系统等。
(4)按控制元件分类:阀控系统和泵控系统。在机械设备中，阀控系统应用较多。


液压伺服系统的特点如下:
(1)反馈。把输出量的一部分或全部按一定方式回送到输入端，并和输入信号进行比较，这就是反馈。在上例中，反馈(测速装置输出)电压和给定(输入信号)电压是异号的，即反馈信号不断地抵消输入信号，这是负反馈。自动控制系统大多数是负反馈。
(2)偏差。要使液压缸输出一定的力和速度，伺服阀必须有一定的开口量，因此输入和输出之间必须有偏差信号。液压缸运动的结果又力图消除这个误差。但在伺服系统工作的任何时刻都不能完全消除这一-偏差，伺服系统正是依靠这一-偏差信号进行工作的。
(3)放大。执行元件(液压缸)输出的力和功率远远大于输入信号的力和功率，其输出的能量是液压能源供给的。
(4)跟踪。液压缸的输出量完全跟踪输入信号的变化。



电液比例阀是比例控制系统中的主要功率放大元件,按输入电信号指令连续地成比例地控制液压系统的压办流量等参数。与伺服控制系统中的伺服阀相比,在某些方面还有一定的性能差距(主要性能比较如表1所示),但它显著的优点是抗污染能力强,大大地减少了由污染而造成的工作故障,提高了液压系统的工作稳定性和可靠性。另一方面比例阀的成本比伺服阀低，结构也简单,已在许多场合获得广泛应用。

比例阀按功能分为三大类
(1)比例压力阀。有溢流阀减压阀,分别有直动和先导两种结构;可连续地或按比例地远程控制其输出油液压力;
(2)比例换向阀。有直动和先导两种结构,直动阀有带位移传感器和不带位移传感器两类。由于使用了比例电磁铁阀芯不仅可以换位，而且换位的行程可以连续地或按比例地变化。因而连通油口间的通流面积也可以连续或按比例地变化。所以比例换向阀不仅能够控制执行元件的方向而且能够控制其速度。因为这个原因比例阀中的比例换向阀应用也普遍;
(3)比例流量阀。有比例调速阀和比例溢流流量控制阀,可连续地或按比例地远程控制其输出流量。
比例阀的输入单元是电-机械转换器,它将输入的电信号转换成机械量转换器有伺服电机和步进电机力马达和力矩马达比例电磁铁等形式。但常用的比例阀大都采用了比例电磁铁，比例电磁铁根据电磁原理设计,能使其产生的机械量(力或力矩和位移)与输入电信号(电流)的大小成比例,再连续地控制液压阀阀芯的位置，进而实现连续地控制液压系统的压力方向和流量。比例电磁铁的结构，它由线圈、衔铁推杆等组成,当有信号输入线圈时,线圈内磁场对衔铁产生作用力,衔铁在磁场中按信号电流的大小和方向成比例连续地运动,再通过固连在一起的销钉带动推杆运动,从而控制滑阀阀芯的运动。应用的比例电磁铁是耐高压直流比例电磁铁。

比例电磁铁的类型按照工作原理主要分为
如下几类:
(1)力控制型
这类电磁铁的行程短，只有1 5mm,输出力与输入电流成正比,常用在比例阀的先导控制级
上:
(2)行程控制型
由力控制型加负载弹簧共同组成，电磁铁输出的力通过弹簧转换成输出位移,输出位移与输入电流成正比，工作行程达3mm,线性好，可以用在直控式比例阀上;
(3)位置调节型
衔铁的位置由传感器检测后,发出一个阀内反馈信号,在阀内进行比较后重新调节衔铁的位置。阀内形成闭环控制,精度高,衔铁的位置与力
无关，精度高的比例阀如德国的博世意大利的阿托斯等都采用这种结构。
比例阀与放大器配套使用放大器采用电流负反馈,设置斜坡信号发生器阶跃函数发生器、PD调节器反向器等,控制升压降压时间或运动加速度及减速度。断电时, 能使阀芯处于安全位置。
比例电磁铁和液压阀组成电液比例阀。由于比例电磁铁可以在不同的电流下得到不同的力(或行程),因此可以无级改变压力、流量。故比例电磁铁是比例阀的关键元件。
REXROTH两位四通比例阀4WRA10EA00-22/G24K4/V-828
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力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯不带位移电反馈，不带集成式放大版（OBE）4WRA
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R902650387 DIR.-CONTROLVALVE 4WRA6E30-23/G24N9K&
R902416026 DIR.-CONTROLVALVE 4WRA6E30-23/G24N9Z&
R910988077 DIR.-CONTROLVALVE 4WRA6V15-23/G24N9K&
R910991712 DIR.-CONTROLVALVE 4WRA6V30-23/G24N9K&
R910988078 DIR.-CONTROLVALVE 4WRA10V30-23/G24N9K4&
R910988165 DIR.-CONTROLVALVE 4WRA10V30-23/G24N9Z4&
R902435562 DIR.-CONTROLVALVE 4WRA6EO7-23/G24NJK31&
力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯不带位移电反馈，带集成式放大版（OBE）4WRAE
R900954084 4WRAE10E1-30-2X/G24K31/A1V
R901311329 4WRAE10E1-30-2X/G24K31/F1V
R900936848 4WRAE10E1-30-2X/G24N9K31/A1V
R901213358 4WRAE10E1-30-2X/G24N9K31/F1V
R900921596 4WRAE10E1-30-2X/G24N9Z31/A1V
R900954409 4WRAE10E1-60-2X/G24K31/A1V
R901049206 4WRAE10E1-60-2X/G24K31/F1V
R900909658 4WRAE10E1-60-2X/G24N9K31/A1V
R901384952 4WRAE10E1-60-2X/G24N9K31/F1M
R900773932 4WRAE10E1-60-2X/G24N9K31/F1V
R900904991 4WRAE10E1-60-2X/G24N9Z31/A1V
R978016005 4WRAE10E3-60-2X/G24N9K31/A1V
R900933793 4WRAE10E30-2X/G24K31/A1V
R901026395 4WRAE10E30-2X/G24K31/F1V
R900920588 4WRAE10E30-2X/G24N9K31/A1V
R900904010 4WRAE10E30-2X/G24N9K31/F1V
R900570901 4WRAE10E30-2X/G24N9Z31/A1V
R900934721 4WRAE10E30-2X/G24Z31/A1V
R900954083 4WRAE10E60-2X/G24K31/A1V
R900965674 4WRAE10E60-2X/G24K31/F1V
R900558356 4WRAE10E60-2X/G24N9K31/A1V
R901038922 4WRAE10E60-2X/G24N9K31/A1V-280
R900929318 4WRAE10E60-2X/G24N9K31/F1V
R900572096 4WRAE10E60-2X/G24N9Z31/A1V
R900908419 4WRAE10E60-2X/G24N9Z31/F1V
R900954085 4WRAE10EA30-2X/G24K31/A1V
R900940206 4WRAE10EA30-2X/G24N9K31/A1V
R900954109 4WRAE10EA30-2X/G24N9K31/F1V
R900914273 4WRAE10EA30-2X/G24N9Z31/A1V
R900954086 4WRAE10EA60-2X/G24K31/A1V
R900786039 4WRAE10EA60-2X/G24K31/F1V
R900916601 4WRAE10EA60-2X/G24N9K31/A1V
R900930423 4WRAE10EA60-2X/G24N9K31/F1V
R900546669 4WRAE10EA60-2X/G24N9Z31/A1V
R900939576 4WRAE10EB30-2X/G24N9K31/A1V
R900906761 4WRAE10EB30-2X/G24N9Z31/A1V
R900926473 4WRAE10EB60-2X/G24N9K31/A1V
R901316266 4WRAE10EB60-2X/G24N9K31/F1V
R900551277 4WRAE10EB60-2X/G24N9Z31/A1V
R900913578 4WRAE10V60-2X/G24N9Z31/A1V
R900953496 4WRAE10W1-30-2X/G24K31/A1V
R900707215 4WRAE10W1-30-2X/G24K31/F1V
R900555967 4WRAE10W1-30-2X/G24N9K31/A1V
R900925687 4WRAE10W1-30-2X/G24N9K31/F1V
R900912261 4WRAE10W1-30-2X/G24N9Z31/A1V
R900954089 4WRAE10W1-60-2X/G24K31/A1V
R900732536 4WRAE10W1-60-2X/G24K31/F1V
R900936006 4WRAE10W1-60-2X/G24N9K31/A1V
R900949757 4WRAE10W1-60-2X/G24N9K31/F1V
R900909337 4WRAE10W1-60-2X/G24N9Z31/A1V
R900961942 4WRAE10W3-30-2X/G24N9K31/A1V
R978011121 4WRAE10W3-60-2X/G24K31/F1V
R900946871 4WRAE10W3-60-2X/G24N9K31/A1V
R900968832 4WRAE10W3-60-2X/G24N9K31/F1V
R900911320 4WRAE10W3-60-2X/G24N9Z31/A1V
R900954087 4WRAE10W30-2X/G24K31/A1V
R901059583 4WRAE10W30-2X/G24K31/A1V-280
R900711868 4WRAE10W30-2X/G24K31/F1V
R900913646 4WRAE10W30-2X/G24N9K31/A1V
R900922439 4WRAE10W30-2X/G24N9K31/F1V
R900900163 4WRAE10W30-2X/G24N9Z31/A1V
R900954088 4WRAE10W60-2X/G24K31/A1V
R901369568 4WRAE10W60-2X/G24K31/F1M
R900710530 4WRAE10W60-2X/G24K31/F1V
R901416065 4WRAE10W60-2X/G24N9K31/A1M
R900900988 4WRAE10W60-2X/G24N9K31/A1V
R900974924 4WRAE10W60-2X/G24N9K31/A1V-280
R900920055 4WRAE10W60-2X/G24N9K31/F1V
R900570097 4WRAE10W60-2X/G24N9Z31/A1V
R901239551 4WRAE10W60-2X=G24N9K31/F1V
R900954090 4WRAE10WA30-2X/G24K31/A1V
R900901949 4WRAE10WA30-2X/G24N9Z31/A1V
R900954091 4WRAE10WA60-2X/G24K31/A1V
R900904801 4WRAE10WA60-2X/G24N9K31/A1V
R901151668 4WRAE10WA60-2X/G24N9K31/F1V
R900966303 4WRAE10WB30-2X/G24K31/A1V
R901239201 4WRAE10WB30-2X/G24N9K31/F1V
R978019392 4WRAE10WB60-2X/G24N9K31/A1V
R901239457 4WRAE10WB60-2X/G24N9K31/F1V
R978916639 4WRAE6E03-2X/G24K31/A1V
R900953168 4WRAE6E03-2X/G24N9K31/A1V
R901066051 4WRAE6E03-2X/G24N9K31/F1V
R900920071 4WRAE6E03-2X/G24N9Z31/A1V
R900954069 4WRAE6E07-2X/G24K31/A1V
R901201706 4WRAE6E07-2X/G24K31/A1V-280
R900759329 4WRAE6E07-2X/G24K31/F1V
R900925006 4WRAE6E07-2X/G24N9K31/A1V
R901130352 4WRAE6E07-2X/G24N9K31/A1V-280
R900925456 4WRAE6E07-2X/G24N9K31/F1V
R900912300 4WRAE6E07-2X/G24N9Z31/A1V
R901015564 4WRAE6E1-07-2X/G24K31/A1V
R900617493 4WRAE6E1-07-2X/G24K31/F1V
R901355164 4WRAE6E1-07-2X/G24N9K31/A1V
R900711880 4WRAE6E1-07-2X/G24N9K31/F1V
R900954072 4WRAE6E1-15-2X/G24K31/A1V
R900738355 4WRAE6E1-15-2X/G24K31/F1V
R900753599 4WRAE6E1-15-2X/G24N9K31/A1V
R900954073 4WRAE6E1-30-2X/G24K31/A1V
R900928872 4WRAE6E1-30-2X/G24N9K31/A1V
R900947058 4WRAE6E1-30-2X/G24N9K31/F1V
R900954070 4WRAE6E15-2X/G24K31/A1V
R901282085 4WRAE6E15-2X/G24K31/A1V-280
R901019997 4WRAE6E15-2X/G24K31/F1V
R900909389 4WRAE6E15-2X/G24N9K31/A1V
R900947059 4WRAE6E15-2X/G24N9K31/F1V
R900553353 4WRAE6E15-2X/G24N9Z31/A1V
R900957274 4WRAE6E3-30-2X/G24N9K31/F1V
R900954071 4WRAE6E30-2X/G24K31/A1V
R901015613 4WRAE6E30-2X/G24K31/F1V
R900558355 4WRAE6E30-2X/G24N9K31/A1V
R900974925 4WRAE6E30-2X/G24N9K31/A1V-280
R900931485 4WRAE6E30-2X/G24N9K31/F1V
R900552113 4WRAE6E30-2X/G24N9Z31/A1V
R900920810 4WRAE6E30-2X/G24N9Z31/F1V
R900745630 4WRAE6EA07-2X/G24K31/A1V
R900966133 4WRAE6EA07-2X/G24N9K31/A1V
R900723376 4WRAE6EA07-2X/G24N9K31/F1V
R900954074 4WRAE6EA15-2X/G24K31/A1V
R901145773 4WRAE6EA15-2X/G24K31/F1V
R900750718 4WRAE6EA15-2X/G24N9K31/A1V
R900957490 4WRAE6EA15-2X/G24N9K31/F1V
R900579463 4WRAE6EA15-2X/G24N9Z31/F1V
R900954075 4WRAE6EA30-2X/G24K31/A1V
R901021332 4WRAE6EA30-2X/G24K31/F1V
R900937158 4WRAE6EA30-2X/G24N9K31/A1V
R900938373 4WRAE6EA30-2X/G24N9K31/F1V
R900916339 4WRAE6EA30-2X/G24N9Z31/A1V
R900929851 4WRAE6EB07-2X/G24N9K31/A1V
R900916594 4WRAE6EB15-2X/G24K31/A1V
R900935661 4WRAE6EB15-2X/G24N9K31/A1V
R900963738 4WRAE6EB15-2X/G24N9K31/F1V
R900969665 4WRAE6EB30-2X/G24N9K31/A1V
R900935958 4WRAE6M30-2X/G24N9K31/A1V
R900909958 4WRAE6M30-2X/G24N9Z31/A1V
R901117558 4WRAE6V03-2X/G24N9K31/A1V
R900703358 4WRAE6V07-2X/G24N9K31/A1V
R901306165 4WRAE6V07-2X/G24N9K31/F1V
R901201460 4WRAE6V1-07-2X/G24N9K31/F1V
R901201458 4WRAE6V1-15-2X/G24N9K31/F1V
R900965020 4WRAE6V1-30-2X/G24N9K31/F1V
R900577739 4WRAE6V1-30-2X/G24N9Z31/A1V
R900578084 4WRAE6V1-30-2X/G24N9Z31/F1V
R900576353 4WRAE6V1-30-2X/G24Z31/F1V
R900758996 4WRAE6V15-2X/G24K31/A1V
R901250162 4WRAE6V15-2X/G24N9K31/A1V
R900551850 4WRAE6V15-2X/G24N9Z31/A1V
R900935370 4WRAE6V30-2X/G24N9K31/A1V
R901424158 4WRAE6V30-2X/G24N9K31/F1V
R900736894 4WRAE6W03-2X/G24N9K31/A1V
R900618361 4WRAE6W03-2X/G24N9K31/F1V
R900954076 4WRAE6W07-2X/G24K31/A1V
R900778280 4WRAE6W07-2X/G24K31/F1V
R900932003 4WRAE6W07-2X/G24N9K31/A1V
R900950144 4WRAE6W07-2X/G24N9K31/F1V
R901026400 4WRAE6W1-07-2X/G24K31/A1V
R901099279 4WRAE6W1-07-2X/G24K31/F1V
R900947785 4WRAE6W1-07-2X/G24N9K31/A1V
R900958128 4WRAE6W1-07-2X/G24N9K31/F1V
R900954079 4WRAE6W1-15-2X/G24K31/A1V
R901018004 4WRAE6W1-15-2X/G24K31/F1V
R900913442 4WRAE6W1-15-2X/G24N9K31/A1V
R900950774 4WRAE6W1-15-2X/G24N9K31/F1V
R900555820 4WRAE6W1-15-2X/G24N9Z31/A1V
R900954080 4WRAE6W1-30-2X/G24K31/A1V
R900974817 4WRAE6W1-30-2X/G24K31/F1V
R900913445 4WRAE6W1-30-2X/G24N9K31/A1V
R900941258 4WRAE6W1-30-2X/G24N9K31/F1V
R900549444 4WRAE6W1-30-2X/G24N9Z31/A1V
R900954077 4WRAE6W15-2X/G24K31/A1V
R900976919 4WRAE6W15-2X/G24K31/F1V
R900908938 4WRAE6W15-2X/G24N9K31/A1V
R901290623 4WRAE6W15-2X/G24N9K31/A1V-280
R900908195 4WRAE6W15-2X/G24N9K31/F1V
R900900159 4WRAE6W15-2X/G24N9Z31/A1V
R901439515 4WRAE6W2-30-2X/G24N9K31/A1V
R900915895 4WRAE6W3-15-2X/G24N9Z31/F1V
R900975416 4WRAE6W3-30-2X/G24N9K31/A1V
R900954078 4WRAE6W30-2X/G24K31/A1V
R900762072 4WRAE6W30-2X/G24K31/F1V
R900900987 4WRAE6W30-2X/G24N9K31/A1V
R900974927 4WRAE6W30-2X/G24N9K31/A1V-280
R900943826 4WRAE6W30-2X/G24N9K31/F1V
R900557303 4WRAE6W30-2X/G24N9Z31/A1V
R900914844 4WRAE6W30-2X/G24N9Z31/A1V-612
R900786463 4WRAE6WA07-2X/G24K31/A1V
R900783251 4WRAE6WA07-2X/G24K31/F1V
R900946529 4WRAE6WA07-2X/G24N9K31/A1V
R900954081 4WRAE6WA15-2X/G24K31/A1V
R900951675 4WRAE6WA15-2X/G24N9K31/A1V
R900901182 4WRAE6WA15-2X/G24N9K31/F1V
R900905675 4WRAE6WA15-2X/G24N9Z31/A1V
R900954082 4WRAE6WA30-2X/G24K31/A1V
R901100348 4WRAE6WA30-2X/G24K31/F1V
R900962407 4WRAE6WA30-2X/G24N9K31/A1V
R900752021 4WRAE6WA30-2X/G24N9K31/F1V
R900903760 4WRAE6WA30-2X/G24N9Z31/A1V
R901170924 4WRAE6WB07-2X/G24N9K31/F1V
R900913647 4WRAE6WB15-2X/G24N9K31/A1V
R901239200 4WRAE6WB15-2X/G24N9K31/F1V
R900941851 4WRAE6WB30-2X/G24N9K31/A1V
力士乐REXROTH比例方向阀，直控式4WRA ...XE
R901158548 4WRA6E07-2X/G24XEJ/V
R901097419 4WRA6E15-2X/G24XEJ/V
R901154863 4WRA6E30-2X/G24XEJ/V
R901254509 4WRA6EA03-2X/G24XEJ/V
R901262600 4WRA6EA07-2X/G24XEJ/V
R901393419 4WRA6EA15-2X/G24XEJ/V
R901173051 4WRA6EA30-2X/G24XEJ/V
R901271117 4WRA6EB07-2X/G24XEJ/V
R901061252 4WRA6W07-2X/G24XEJ/V
R901368290 4WRA6W1-07-2X/G24XEJ/V
R901066698 4WRA6W1-15-2X/G24XEJ/V
R901028052 4WRA6W1-30-2X/G24XEJ/V
R901177023 4WRA6W15-2X/G24XEJ/V
R901053397 4WRA6W30-2X/G24XEJ/V
R901123241 4WRA6WA30-2X/G24XEJ/V
力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，不带集成式放大版（OBE）4WRE
R902650795 4WRE6V32-2X/G24K4V-822
R900726605 4WRE10E1-25-2X/G24K4/V
R900954103 4WRE10E1-50-2X/G24K4/V
R900954104 4WRE10E1-75-2X/G24K4/V
R902435414 4WRE10E25-2X/24Z4/V-93
R900954100 4WRE10E25-2X/G24K4/V
R902650773 4WRE10E25-2X/G24K4V-93
R901048036 4WRE10E3-75-2X/G24K4/V
R900954101 4WRE10E50-2X/G24K4/V
R900954102 4WRE10E75-2X/G24K4/V
R901039213 4WRE10EA25-2X/G24K4/V
R900752971 4WRE10EA50-2X/G24K4/V
R900969351 4WRE10EA75-2X/G24K4/V
R900703186 4WRE10EB50-2X/G24K4/V
R901151585 4WRE10V1-25-2X/G24K4/V
R901415922 4WRE10V1-50-2X/G24K4/M
R901017446 4WRE10V1-50-2X/G24K4/V
R901414444 4WRE10V1-75-2X/G24K4/V
R900954115 4WRE10V25-2X/G24K4/V
R900954116 4WRE10V50-2X/G24K4/V
R901236220 4WRE10V50-2X=G24K4/V
R900954117 4WRE10V75-2X/G24K4/V
R900974152 4WRE10W1-25-2X/G24K4/V
R900954113 4WRE10W1-50-2X/G24K4/V
R900954114 4WRE10W1-75-2X/G24K4/V
R900954105 4WRE10W25-2X/G24K4/V
R900608420 4WRE10W3-75-2X/G24K4/V
R900954106 4WRE10W50-2X/G24K4/V
R900954107 4WRE10W75-2X/G24K4/V
R901436393 4WRE10WA25-2X/G24K4/V
R901086329 4WRE10WA50-2X/G24K4/V
R901030897 4WRE10WA75-2X/G24K4/V
R901339372 4WRE10WB75-2X/G24K4/V
R901031274 4WRE6E04-2X/G24K4/V
R900933478 4WRE6E08-2X/G24K4/V
R900968149 4WRE6E1-08-2X/G24K4/V
R900954093 4WRE6E1-16-2X/G24K4/V
R900954094 4WRE6E1-32-2X/G24K4/V
R900954092 4WRE6E16-2X/G24K4/V
R900926366 4WRE6E32-2X/G24K4/V
R900783105 4WRE6EA08-2X/G24K4/V
R900720198 4WRE6EA16-2X/G24K4/V
R900752799 4WRE6EA32-2X/G24K4/V
R901364823 4WRE6Q2-08-2X/G24K4/V
R900246943 4WRE6V04-2X/G24K4/V
R900954097 4WRE6V08-2X/G24K4/V
R902650793 4WRE6V08-2X/G24K4V-822
R900966805 4WRE6V1-16-2X/G24K4/V
R901403868 4WRE6V16-2X/G24K4/M
R900954098 4WRE6V16-2X/G24K4/V
R902651062 4WRE6V16-2X/G24K4/V-916
R902650794 4WRE6V16-2X/G24K4V-822
R900954099 4WRE6V32-2X/G24K4/V
R901246418 4WRE6W04-2X/G24K4/V
R900941264 4WRE6W08-2X/G24K4/V
R900953729 4WRE6W1-08-2X/G24K4/V
R900954095 4WRE6W1-16-2X/G24K4/V
R901236264 4WRE6W1-16-2X=G24K4/V
R900954096 4WRE6W1-32-2X/G24K4/V
R900775379 4WRE6W1-32-2X/G24K4/V=LB
R900944121 4WRE6W16-2X/G24K4/V
R900773304 4WRE6W16-2X/G24K4/V=LB
R900933480 4WRE6W32-2X/G24K4/V
R901433171 4WRE6W9-32-2X/G24K4/V
R901022178 4WRE6WA08-2X/G24K4/V
R900965434 4WRE6WA16-2X/G24K4/V
R901300969 4WRE6WA16-2X/G24K4/V-303
R901011624 4WRE6WA32-2X/G24K4/V
R902437398 4WRE6V08-2X/G24Z4/V-822
R902437418 4WRE6V16-2X/G24Z4/V-822
R902461723 4WRE6V16-2X/G24Z4/V-916
R902437419 4WRE6V32-2X/G24Z4/V-822
力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，带集成式放大版（OBE）4WREE
R900958157 4WREE10E1-25-2X/G24K31/A1V
R901268119 4WREE10E1-25-2X/G24K31/A1V-280
R901066667 4WREE10E1-25-2X/G24K31/F1V
R900933076 4WREE10E1-50-2X/G24K31/A1V
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力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，带集成式放大版（OBE）4WREE
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液压执行元件
将液压能转换为机械能的装置，其作用是在压力油的推动下输出力和速度或转矩和速度，以驱动工作装置做工。例如液压缸、液压马达。
2.1液压马达
液压马达习惯上是指输出旋转运动的，将液压泵提供的液压能转变为机械能的能量转换装置。
液压马达亦称为油马达，主要应用于注塑机械、船舶、起扬机、工程机械、建筑机械、煤矿机械、矿山机械、冶金机械、船舶机械、石油化工、港口机械等。
高速马达齿轮马达具有体积小、重量轻、结构简单、工艺性好、对油液的污染不敏感、耐冲击和惯性小等优点。缺点有扭矩脉动较大、效率较低、起动扭矩较小(仅为额定扭矩的60%-一70%)和低速稳定性差等。
2.2液压缸
液压缸是将液压能转变为机械能的、做直线往复运动(或摆动运动)的液压执行元件。它结构简单、工作可靠。用它来实现往复运动时，可免去减速装置，并且没有传动间隙，运动平稳，因此在各种机械的液压系统中得到广泛应用。液压缸输出力和活塞有效面积及其两边的压差成正比;液压缸基本上由缸筒和缸盖、活塞和活塞杆、密封装置、缓神装置与排气装置组成。缓神装置与排气装置视具体应用场合而定，其他装置则必不可少。
3.3液压控制调节元件
用来控制液压传动系统中油液的流动方向、压力和流量，以保证液压执行元件和工作装置完成指定工作。
液压传动中用来控制液体压力、流量和方向的元件。其中控制压力的称为压力控制阀，控制流量的称为流量控制阀，控制通、断和流向的称为方向控制阀。
3.4液压辅助元件
保证液压传动系统正常工作。例如油箱、油管、滤油器。
液压辅件是系统的一一个重要组成部分，其合理设计和选用在很大程度上影响液压系统的效率、噪声、温升、工作可靠性等技术性能。主要包括:
3.4.1过滤器
过滤器的作用:滤去油中杂质，维护油液清洁，防止油液污染，保证系统正常工作。
3.4.2蓄能器
蓄能器的作用:
蓄能器是液压系统中储存和释放压力能的装置。
1.作辅助动力源或紧急动力源在工作循环不同阶段需要的流量变化很大时，常采用蓄能器和一个流量较小的泵组成油源。另外当驱动泵的原动机发生故障时，蓄能器可作紧急动力源。
2.保压和补充泄漏需要较长时间保压而泵卸载时，可利用蓄能器释放储存的压力油，补充系统泄漏，保持系统压力。
3.吸收冲击和消除压力脉动在压力冲击处和泵的出口安装蓄能器可吸收压力冲击峰值和压力脉动，提高系统工作的平稳性。
3.4.3油箱
油箱是液压系统中储存液压油用。
油箱的功用:
储存系统所需的足够油液;;
散发油液中的热量;
逸出溶解在油液中的空气; :
沉淀油液中的污物;
对中小型液压系统，泵装置及一些液压元件还安装在油箱顶板上。
3.4.4热交换器
系统能量损失转换为热量以后，会使油液温度升高。若长时间油温过高,油液粘度下降，泄漏增加，密封老化，油液氧化，严重影响系统正常工作。为保证正常工作温度在20~65C，需要在系统中安装冷却器。相反，油温过低，油液粘度过大，设备启动困难，压力损失加大并引起过大的振动。此种情况下系统应安装加热器，将油液温度升高到适合的温度。
3.4.5管件
管件是用来连接液压元件、输送液压油液的连接件。它应保证有足够的强度,没有泄漏,密封性能好，压力损失小，拆装方便。
3.4.6密封装置
密封装置用来防止系统油液的内外泄漏，以及外界灰尘和异物的侵入，保证系统建立必要压力。
3.5液压工作介质
工作介质指传动液体，通常被称为液压油。
3.5.1液压油
液压油引就是利用液体压力能的液压系统使用的液压介质，在液压系统中起着能量传递、系统润滑、防腐、防锈、冷却等作用。对于液压油来说，首先应满足液压装置在工作温度下与启动温度下对液体粘度的要求，由于油的粘度变化直接与液压动作、传递效率和传递精度有关，还要求油的粘温性能和剪切安定性应满足不同用途所提出的各种需求。
3.5.2液压油的要求
质量要求:
1.合适的粘 度和良好的粘温性能，以保证液压元件在工作压力和工作温度发生变化的条件下得到良好润滑、冷却和密封。
2.良好的极压抗磨性， 以保证油泵、液压马达、控制阀和油缸中的摩擦副在高压、高速苛刻条件下得到正常的润滑，减少磨损。
3.优良的抗氧化安定性、水解安定性和热稳定性，以抵抗空气、水分和高温、高压等因素的影响或作用，使其不易老化变质，延长使用寿命。
4.良好的抗泡性 和空气释放值，以保证在运转中受到机械剧烈搅拌的条件下产生的泡沫能迅速消失:并能将混入油中的空气在较短时间内释放出来，以实现准确、灵敏、平稳地传递静压。
5.良好的抗乳化性， 能与混入油中的水分迅速分离，以免形成乳化液，引起液压系统的金属材质锈蚀和降低使用性能。
6.良好的防锈性，以防止金属表面锈蚀。