REXROTH 0811404662

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REXROTH 0811404662 力士乐比例阀  力士乐REXROTH比例阀，REXROTH阀工作原理

REXROTH力士乐比例阀其实缺点极多：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，控制比伺服药灵活一些。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，向应要慢。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！ 

伺服阀与比例阀的区别 

REXROTH力士乐比例阀与比例阀之间的差别并没有严格的规定，因为比例阀的性能越来越好，逐渐向伺服阀靠近，所以近些年出现了比例伺服阀。 

力士乐REXROTH比例阀，REXROTH阀工作原理REXROTH力士乐比例阀非要说差别，主要体现在一下几点： 

伺服阀中位没有死区，比例阀有中位死区； 

伺服阀的频响（响应频率）更高，可以高达200Hz左右，比例阀一般几十Hz； 

伺服阀对液压油液的要求更高，需要精过滤才行，否则容易堵塞，比例阀要求低一些。 

REXROTH力士乐比例伺服阀性能介于伺服阀和比例阀之间。 

REXROTH力士乐比例换向阀属于比例阀的一种，用来控制流量和流向。

力士乐REXROTH比例阀，REXROTH阀工作原理

力士乐Rexroth比例阀在使用过程中,应注意对感载比例阀的检查调整.当感载弹簧过松时,后轮制动力就会减小,此时应调整感载弹簧,但不可调得过紧,否则会使后轮制动力太大而失去侧向控制能力,发生甩尾。正确的调整方法是.在平坦的地面上使车身落地,车辆空载,调整感载弹簧,使杠杆与活塞间无间隙即可.在有条件的情况下,可采用的调整方法.通过测量前后轮制动管路压力,绘制压力分配特性曲线,确认调整是否合格。

德国Rexroth力士乐比例阀的工作原理，REXROTH力士乐比例阀结构，力士乐比例阀作用

REXROTH力士乐比例阀当左侧受力大于右侧受力与感载弹簧预紧力之和时（此时的压力为Ps）,活塞不断右移,后使阀门与阀座接触而关闭,将输入输出油路隔绝,达到平衡状态。P1若进一步升高时,则活塞左移,阀门再度打开,制动液流入出油口,使P2也升高。

德国rexroth比例阀VT-NE30-2X的输入压力为零.即.;时,输出腔的压力通过比例阀皮圈凸筋间空酸从唇口泄去高压,同时,当比例阀芯所受的弹簧力大于向右的液压力时,比例阀弹簧将比例阀芯推回原始位置,使比例阀芯与比例阀皮圈内孔完全分离而完全泄压.此时输入输出压力为零.随着输入压力.增大,即左增大,使比例滑阀单向力平衡遭破坏.当<>&;6-时,比例阀芯左移与比例阀皮圈产生间隙形成节流并混合比倒阀常见的故障为:1,输入输出压力同步.2,低压时辅人输出压力同步,高压时输入输出压力正常.3,低压时输入输出压力正常,高压时输入输出压力不正常.,1994.№为零时为混合比倒圉工作性能试验示意图.试验时,先将管内的空气排净,然后分别取低,中,高三个压力进行试验,输入辅出压力符合即为合格。

Rexroth力士乐比例阀奥迪四轮驱动轿车制动系统在关闭ABS后,感载比例阀可用于防止后轮的过制动。当汽车直线行驶时,两后轮的制动压力可根据车辆载荷增减;当汽车左转弯时,左后轮载荷下降,由于感载比例阀位于左后轮附近,可同样起作用使两后轮的制动压力都下降.而当汽车右转弯时,右后轮载荷减小,汽车的侧向加速度使感载比例阀起作用,降低右后轮的制动压力。这样的自动调节使前、后轮的制动力分配和左、右后轮的制动力分配都接近理想的制动力分配,从而提高了制动安全性

比例阀(Proportional valve) 阀对流量的控制可以分为两种：

一种是开关控制：要么全开、要么全关，流量要么大、要么小，没有中间状态，如普通的电磁直通阀、电磁换向阀、电液换向阀。

另一种是连续控制：阀口可以根据需要打开任意一个开度，由此控制通过流量的大小，这类阀有手动控制的，如节流阀，也有电控的，如比例阀、伺服阀。

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，因为它需要一定的流量来维持前置级控制油路的工作。

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4WS2EM10-4X/75B2ET315K8DV-24 R900972861 4WSE2EM6-2X/5B8ET315K17EV R900972857 4WSE2ED10-5X/60B13-315K31EV R900972795 4WS2EB10-4X/10B1-70K8AV R900972567 4WSE2ED16-2X/150B9T315K9EV R900971769 4WSE3EE16-1X/200B9ET315K9EV R900971159 4WS2EM6-2X/2B12ET315K17EV R900971033 4WS2EM10-4X/45B2T315K8DM R900970565 4WSE2EM6-2X/5B9ET210K17EV R900970346 4WS2EM6-2X/5B12ET315K17EV R900970191 4WS2EM6-2X/15B12ET315K17EV R900970190 4WS2EM6-2X/20B12ET315K17EV R900969969 4WS2EB10-4X/45B2ET210K8AV R900969967 4WS2EB10-4X/60B2-140K8BV R900969730 4WS2EM6-2X/15B12ET210K17EV R900968835 4WSE2EM6-2X/20B9ET210K17EV R900968833 4WS2EM6-2X/10B12ET315K17EV R900968455 4WSE2EM10-5X/75B9T315K31EV R900968259 4WS2EM10-5X/60B11ET315K31AV R900967982 4WSE2EM6-2X/10B9ET210K17EV R900967673 4WSE3EE16-1X/300B9-210K9EV R900967562 4WS2EB10-4X/10B2ET40K8AV R900967548 4WS2EM10-4X/45B3T315K8CV R900967114 4WSE2EM6-2X/2B9ET210K17EV R900966680 4WSE2ED10-5X/75B13ET210K31EV R900966344 4WS2EM10-4X/45B3T315K8CV-94 R900966097 4WS2EM16-2X/150B12T315K8EV R900966039 4WS2EM10-4X/20B2T315K8EV R900965878 4WSE2ED10-5X/20B13T315K31EV R900965624 4WS2EE10-4X/45B2T210K8DV R900965141 4WS2EM10-4X/75B2T315K8DV R900964991 4WS2EM10-4X/5B2ET315K8DV R900964903 4WS2EM10-4X/75B3T315K8CV R900964149 4WS2EB10-4X/60B2ET70K8DM R900963923 4WSE2EE10A-4X/45B9T140K9DV R900963834 4WSE3EE25-2X/400B8-210K9EV R900963795 4WSE2EE10-4X/60B9ET315K9DV R900963739 4WSE2ED10-5X/45B13-210K31EV R900963401 4WS2EM10-4X/20B3T315K8DV-24 R900962103 4WSE2EE10-4X/10B9ET315K9EV R900962068 4WSE2EE10-4X/10B8T315K9DV R900961862 4WS2EM10-4X/10B2ET315K8BV-52 R900961403 4WS2EM10-4X/5B2ET315K8BV-52 R900961254 4WS2EM10-4X/5B3T315K8DV-24 R900961252 4WS2EM10-4X/10B3T315K8DV-24 R900960971 4WS2EM10-4X/30B2T315K8EV R900960652 4WS2EM16-2X/150B12T315K8CV-104 R900960651 4WS2EM10-4X/75B3T315K8CV-24 R900960575 4WS2EM16-2X/200B12ET315K8EV R900960539 4WS2EB10-4X/45B2ET40K8AV R900960536 4WSE3EE25-2X/500B8-315K9EV R900960302 4WS2EM10-4X/20B4ET315K8EV R900960229 4WS2EM10-4X/10B3T315K8DV R900960157 4WSE2ED16-2X/100B9T315K9EV R900959626 4WSE3EE16-1X/100B8T315K9EV R900958815 4WS2EM10-4X/30B1ET315K8BV R900958796 4WSE2EE10A-4X/60B9ET315K9DV R900958263 4WS2EM10-5X/20B11-315K31EV R900957873 4WS2EM16-2X/200B12ET315K8DV R900957872 4WS2EM10-4X/75B3ET315K8DV R900956874 4WS2EM10-5X/30B11ET315K31DV R900956873 4WS2EM10-5X/45B11ET315K31DV R900956598 4WS2EM10-5X/75B11T315K31DV R900956422 4WS2EM10-5X/60B11-210K31EV R900956128 4WS2EM10-5X/10B11ET315K31EV R900955905 4WSE2ED10-5X/90B13-315K31EV 电液比例阀简称比例阀。普通液压阀只能通过预调的方式对液流的压力、流量进行定值控制。但是当设备机构在工作过程中要求对液压系统的压力、流量参数进行调节或连续控制，例如.要求工作台在工作进给时按慢、快、慢连续变化的速度实现进给，或按一定精度模拟某个佳控制曲线实现旅力控制.普通液压阀则实现不了。这时可以用电液比例阀对液压系统进行控制。 电液比例阀是一种按输入的电信号连续地、按比例地控制液压系统的液流方向、流量和压力的阀类。它山电-机械比例转换装置和液压控制阀本体两大部分构成.前者将输入的电信号连续地按比例地转换为机械力和位移输出，后者在接受这种机械力和位移之后、按比例连续地输出压力和流量. 电液比例阀的发展主要有两个途径一是用比例电磁铁取代传统液压阀的手动调节装置或取代普通电磁铁发展起来的;二是由电液伺服阀简化结构、降低精度发展起来的。下面介绍的比例阀均指前者，它是当今比例阀的主流。与普通液压阀可以互换。 比例电磁阀的结构如图5-27所示。比例电磁铁是直流电磁铁，但它与普通直流电磁铁不同。普通直流电磁铁的衔铁只有吸合和断开两个工作位置，并且在吸合时磁路中几乎没有气隙.而比例电磁铁要求吸合力或位移与给定电流成比例。并在衔铁的全部工作行程上，磁路中保持一定的气隙‘.其结构主要由极靴1、线圈2、壳体5和衔铁10等组成。线圈2中通电后产生磁场，因隔磁环4的存在。使磁力线主要部分通过衔铁10、气隙和极靴1，形成回路口极靴对衔铁产生吸力门在线圈中电流一定时。吸力的大小因极靴1与衔铁间的距离不同而变化。但衔铁在气隙适中的一段行程中，吸力随位置的改变发生的变化很小。 设计中就使比例电磁铁的衔铁在这段行程中工作。因此。改变线圈中的电流，即可在衔铁上得到与其成正比的吸力。用比例电磁铁代替螺旋手柄来调整液压阀，就能使输出乐力或流量与输人电流对应成比例地发生变化。 比例阀用于模拟控制，是介于普通开关控制与伺服控制之间的控制方式，它也特别适合于 设备的革新或改造。使设备自动化控制水平大为提高。其在现代液雌系统中占比例很大口 与普通液压阀相比.比例阀的优点是:①能简单地实现远距离控制:②能连续地、按比例地控制液压系统的压力和流量。从而实现对执行机构的位置、速度和力的连续控制，并能防止或减小压力、速度变换时的冲击;③油路简化，元件数量少。 比例阀适用于既要求能连续控制胀力、流量.和方向.而又不需要很I的控制精度的场合。 比例阀也分为压力阀、流量阀和方向阀几大类。近来又出现了功能复合化的趋势。 R900955841 4WSE2ED10-5X/45B13-315K31EV R900955802 4WSE2ED10-5X/75B13-315K31EV R900955614 4WSE2ED10-5X/30B13T315K9EV-100 R900955382 4WSE2EM10-5X/45B9ET210K31EV R900953933 4WSE3EE25-2X/400B9-315K9EM R900952651 4WS2EM10-5X/45B11-315K31EV R900952168 4WSE2EM6-2X/20B9ET315K17EV R900952167 4WSE2EM6-2X/15B9ET315K17EV R900952166 4WSE2EM6-2X/10B9ET315K17EV R900952165 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4WSE3EE16-1X/300B9-315K9EV R900949293 4WSE3EE16-1X/200B9-315K9EV R900949292 4WSE3EE16-1X/150B9-315K9EV R900949290 4WSE3EE16-1X/100B9-315K9EV R900949289 4WSE2EM10-5X/75B9ET315K31EV R900949288 4WSE2EM10-5X/45B9ET315K31EV R900949287 4WSE2EM10-5X/30B9ET315K31EV R900949286 4WS2EM10-5X/60B11ET315K31EV R900949285 4WS2EM10-5X/30B11ET315K31EV R900949225 4WSE2EM10-4X/30B9ET315K13EV R900949224 4WS2EM10-5X/20B11T210K31EV R900948483 4WS2EM10-5X/90B11-315K31EV R900948407 4WSE2ED10-5X/75B9ET315K31DV R900948145 4WSE2EM10-5X/60B9-315K31EV R900947866 4WS2EM10-5X/90B0T210K9CV-112 R900946690 4WSE2EM10-5X/20B9ET315K31EV R900946442 4WS2EM10-4X/45B2ET315K8DV R900946396 4WSE2EM10-5X/60B9ET315K31EV R900946011 4WS2EB10-4X/75B2ET210K8EV R900945465 4WSE2ED16-2X/150B9T210K9AM R900944630 4WS2EM16-2X/200B12T315K8CV-114 R900944398 4WSE2ED10-5X/60B9ET315K31EV R900943365 4WSE3EE16-1X/150B8T315K9EV R900942382 4WSE3EE16-1X/200B8T315K9EM-3 R900942001 4WS2EM10-4X/60B2T315K8EV R900941297 4WSE2EM10-5X/90B9ET210K31EV 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