0811404742力士乐REXROTH比例阀

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0811404742力士乐REXROTH比例阀  比例控制阀主要用於开回路控制(open loop control);比例控制阀的输出量与输入信号成比例关系，且比例控制阀内电磁线圈所产生的磁力大小与电流成正比。

在传统型式的液压控制阀中，只能对液压进行定值控制，例如:压力阀在某个设定压力下作动，流量阀保持通过所设定的流量，方向阀对於液流方向通/断的切换。因此这些控制阀组成的系统功能都受到一些限制，随著技术的进步，许多液压系统要求流量和压力能连续或按比例地随控制阀输入信号的改变而变化。液压伺服系统虽能满足其要求，而且精度很高，但对於大部分的工业来说，他们并不要求系统有如此高的品质，而希望在保证一定控制性能的条件下，同时价格低廉，工作可靠，维护简单，所以比例控制阀就是在这种背景下发展起来的。

比例控制阀可分为压力控制阀，流量控制及方向控制阀三类。

压力控制阀:用比例电磁阀取代引导式溢流阀的手调装置便成为引导式比例溢流阀，其输出的液压压力由输入信号连续或按比例控制。

流量控制阀:用比例电磁阀取代节流阀或调速阀的手调装置而以输入信号控制节流阀或调速阀之节流口开度，可连续或按比例地控制其输出流量。故节流口的开度便可由输入信号的电压大小决定。

方向控制阀:比例电磁阀取代方向阀的一般电磁阀构成直动式比例方向阀，其滑轴不但可以换位，而且换位的行程可以连续或按比例地变化，因而连通油口间的通油面积也可以连续或按比例地变化，所以比例方向控制阀不但能控制执行元件的运动方向外，还能控制其速度。

力士乐REXROTH比例阀，REXROTH阀工作原理

REXROTH力士乐比例阀其实缺点较多：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较高的。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。 

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，比例阀一般较高几十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,可采用准确的调整方法.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,较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.加大,即左加大,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。

Rexroth力士乐压力阀

直动式溢流阀：DBD，KDB

 

先导式溢流阀：ZDB，Z2DB，ZDBK，Z2DBK，DBA，

 

              DBAW，DBAE，DB，DBW

直动式减压阀：DR6DP，DR10DP，ZDR，DR-4X，

 

              DR-5X，DR10K，DRHD，ZDRHD，KRD

 

先导式减压阀：ZDR10V，ZDRK6V，ZDRK10V，KTV，DR

 

顺 序 阀：  ZD6D，ZD10D，DZ10，DZ25，DZ32

 

压力截止阀：    DA，Kav

DR20-5-5X/200Y、DR20-5-5X/315Y、DR30-5-5X/100Y、DR30-5-5X/200Y

 

DR30-5-5X/315Y

 

 

先导式减压阀（DR10K）：

 

DR10K5-3X/50YM、DR10K5-3X/100YM、DR10K5-3X/200YM、DR10K5-3X/315YM

 

 

 

先导式减压阀（ZDR10）：

 

ZDR10VA5-3X/50Y、ZDR10VA5-3X/100Y、ZDR10VA5-3X/200Y、ZDR10VB5-3X/100Y

 

ZDR10VB5-3X/200Y、ZDR10VP5-3X/100YM、ZDR10VP5-3X/200YM、ZDR10VP5-3X/315YM

 

 

 

先导式减压阀（ZDRK6VP）：

 

ZDRK6VP5-1X/50YMV、ZDRK6VP5-1X/100YMV、ZDRK6VP5-1X/210YMV

 

 

 

先导式减压阀（ZDRK10V）：

 

ZDRK10VA5-1X/50YV、ZDRK10VA5-1X/100YV、ZDRK10VA5-1X/210YV

 

ZDRK10VB5-1X/50YV、ZDRK10VB5-1X/100YV、ZDRK10VB5-1X/210YV

 

ZDRK10VP5-1X/50YMV、ZDRK10VP5-1X/100YMV、ZDRK10VP5-1X/210YMV

 

规格6和10

安装面按DIN24340A型和ISO4401

控制流量的方向和大小

用于位置、速度和压力的闭环控制

通过控制电磁铁触发

通过感应位置检验器对控制滑阀进行位置传感

集成电控器（OBE），用于4WRPEH

特性曲线带或不带变化

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