REXROTH插装阀盖板LFA25DBU2A2-71/315A200

REXROTH插装阀盖板LFA25DBU2A2-71/315A200 R900923101，德国力士乐插装阀盖板，购买进口液压、气动、自动化控制工业配件，认准“上海韦米机电设备有限公司”，7年老店，保证产品原厂原装，价格优惠，售后无忧，欢迎新老客户咨询采购！
 
插装阀在液压系统中的应用.
插装阀具有内阻小，结构简单，工作可靠，标准化程度高，对于大流量、高压力、较复杂的液压系统可以显著的减小尺寸和重量等特点;而实心胎硫化机组液压系统工作时需要大流量、高压力油，因而，此系统可以应用插装阀满足要求。
一、
插装阀的工作原理及特点
插装阀是另一类液压控制阀的统称。其基本核心元件是一种液控型、单控制口的装于油路主级中的两通液阻单元(故又称二通插装阀)。将一一个或若干个插入元件进行不同的组合，并配以相应的先导控制级，可以组成插装阀的各种控制功能单元。比如方向控制功能单元、压力控制单元、流量控制单元、复合控制功能单元。
插装阀具有以下特点:内阻小，适宜大流量工作，阀口多数采用锥面密封，因而泄漏小，对于乳化液等地粘度的工作介质也适宜，结构简单、工作可靠、标准化程度高;对于大流量、高压力、较复杂的液压系统可以显著的减小尺寸和重量。
其结构:先导阀，控制盖板，插装件。
它是由插入元件、控制盖板、通道块三大部分组成。插入元件有阀芯、阀套、弹簧和密封件组成;控制盖板上根据插装阀的不同控制功能，安装有相应的先导控制级元件;通道块既是嵌入插入元件及安装控制盖板的基础阀体，又是主油路和控制油路的连通体。其中A、B为主油路通口，C为控制油路通口。A、B、C油口的压力和作用面积分别为PA、PB、PC和A1、A2、A3，A3=A1+A2， Fs为弹簧作用力。
二通插装阀通过不同的盖板和各种先导阀组合，便可构成方向控制阀、压力控制阀和流量控制阀。
1、插装阀构成压力控制阀
根据插装阀的工作原理当PAA1+PBA2 >PCA3+FS时，阀芯开启，油路A、B接通。插装阀C14，当电磁阀得电时，插装阀C14的C口直接通油箱，其C口压力为零。由此可知油路A、B接通，当A口的压力大于弹簧力的时候，系统压力油回油箱，所以此插装阀起溢流阀的作用，控制油缸径油口压力。
2、插装阀构成方向控制阀
由液压动作程序表可知，同时得电,来控制主油缸上行运动。当两者同时得电时插装阀C11、C13的C口通油箱PA>FS时,A、B口直接相通，油液可从A流向B口;当只有一个电磁阀得电时，主油缸下行运动。其中C13的PA<PB,阀芯开启，油液可从B流向A。此二处插装阀起到了单向阀的作用。
3、插装阀构成流量控制阀
在阀的顶盖上有阀芯升高限位装置通过调节限位装置的位置，便可调节阀口通流截面的大小，从而调节了流量。通过调节流量，可调节主油缸的下行速度。此插装阀作节流阀。
三、
插装阀在液压系统的简单应用，通过更为复杂的组合，可以实现更多的液压阀的功能。通过组合，插装阀可作为压力控制阀(顺序阀、减压阀)、流量控制阀(单向节流阀、节流阀)、方向控制阀(调速阀、液控单向阀、两位两通换向阀等)以及复合阀。


1、移架速度低已成为制约综采产量的-一个重要因素。为加快移架速度,在支架的液压系统中采用插装阀。插装式方向阀也是采用电磁阀作为先导阀，对主阀(锥阀进行先导控制,控制原理等同于电液操纵阀，但插装阀的通流能力(可达10000L/min以上大、响应快、工作可靠等突出优点，是管式阀无可比拟的，使其更适于在支架的电液控制系统中使用，而无需研制采用电磁先导控制的专用大流量主阀，既能满足使用要求,又可改善工作性能,提高通用化程度,从根本上解决由管式阀固有缺陷所产生的问题。
此外，采用插装阀设计支架液压系统还具有下列优势:
(1插装阀的优点十分适合支架的工况。液压支架的工况特点是:介质粘度低、工作压力高、流量大、工作环境恶劣、介质污染严重。插装阀的长处能得到充分发挥。
(2符合流体传动技术的发展趋势。为降低使用成本，消除环境污染，流体传动技术正向着使用纯水介质方向发展。液压支架是用同纯水性质比较接近的高水基乳化液作为工作介质，很有可能成为该技术发展成果的受益者,正趋向于采用纯水工作介质。由于水的粘度低，要求阀的密封性好,以提高系统的效率。插装阀采用锥面密封，具有优良的密封性能，更适于在纯水介质中工作，应作为纯水支架的首选阀种。
(3抗污染能力强、工作可靠。支架工作在采煤面，介质污染程度高，使阀芯磨损严重,缩短了阀的使用寿命，由此也导致了支架的各种故障，使工作可靠性降低，增加了维护时间，降低了工作面的生产率。插装阀的阀芯和阀套间无严格的配合要求，磨损轻，不易堵塞,也不会产生液压卡紧现象，在介质较脏时仍能保证支架液压系统正常、可靠地工作。
(4满足某些特殊工况的需要。如用于周期来压强烈的坚硬且难以冒落顶板的支撑式支架，在老顶突然来压时，立柱下腔控制阀中的安全阀，要通过很大的瞬时流量,普通安全阀的通流能力远不能满足通流要求，因而专门设计了充气式大流量安全阀，来适应这种工况。但该种阀的结构复杂，制造难度大，装配要求高,工作可靠性差，很难满足使用要求。而且，立柱下腔还要装设普通安全阀来适应正常工况的需要,这无疑会增加元件数量和制造成本。而采用插装式溢流阀，则能很容易解决这一难题,又会使系统简化。

2、工作原理分析
基于.上述分析,提出了用插装阀设计电液控制支架液压系统的设计思想和方案，其工作原理。该系统由电气和液压两部分组成,内储支架动作程序的微型计算机中央和支架控制器发出指令后，插装式方向阀中的电磁先导阀先动作,启闭相应的两通锥阀，接通或断开立柱或推移千斤顶的油路,使之按照-定顺序动作。立柱或推移千斤顶的工作状况由压力和位移传感器反馈到控制器，控制器根据反馈信号决定下一个动作。
由于中央控制器和支架控制器相互联网，故从中央控制器或各架的控制器都可以控制工作面任何--架支架的动作。
中央控制器的作用是控制和协调每台支架的控制器。此外，还能自动编程，修改系统参数,监测每台支架的工作状况,显示采煤机运行速度等。它可对支架的各个动作进行单独控制、顺序控制、成组控制和全自动控制。支架控制器通过插装式方向阀直接控制所在支架，同时将传感器采集的工况数据向其它支架和中央控制器发送。支架液压系统在接收到信号后，将完成下列动作过程:
(1升架立柱的动作由插装式方向阀8控制,当方向阀8中先导阀的电磁铁
1YA通电2YA断电时，该阀切换到左位,4个2通阀中的b和d的上腔通压力油,处于关闭状态,a和c的上腔通油箱,处于开启状态，泵站提供的压力液经2通阀c和液控单向阀，此时液控单向阀中的二位三通先导阀处于位置,工作同于普通单向阀中的2通阀进入立柱的下腔，立柱上腔的乳化液经方向阀8中的二通阀a回液，立柱伸出,实现升架。
立柱的无杆腔油路_上设有插装式液控单向阀和溢流阀组成的控制阀组，当顶梁接触顶板，立柱下腔的压力上升到泵站卸载压力时,液控单向阀关闭，支架达到初撑力;此后，随着顶板的下沉,使立柱下腔的压力上升到溢流阀的调定开启压力时，溢流阀开启卸载,立柱下腔的压力又降低，当立柱下腔的压力降低到溢流阀的闭合压力时，溢流阀又关闭。此后，将重复上述过程，使立柱下腔的压力在溢流阀的调定值附近变化，支架工作在恒阻支撑状态。由于插装阀的响应速度快，使立柱下腔压力变化小，支架的恒阻支撑性好,利于顶板的管理。
该系统在支架的升架过程中也实现了初撑、增阻和恒阻3个阶段，初撑力的大小由泵站压力决定,工作阻力的大小由溢流阀的调定压力决定。
(2降架当使插装式方向阀8中先导阀的电磁铁2YA通电,1YA断电时,该阀切换到右位,4个二通阀中的a和c的上腔通压力油，处于关闭状
态,b和d的上腔通油箱,处于开启状态，泵站提供的压力液经二通阀b进入立柱的上腔，同时将液控单向阀中的先导阀切换到右位，使其中二通阀的上腔通油箱,处于开启状态，立柱下腔的油液经液控单向阀中的二通阀回液，立柱缩回，实现降架。.降架结束后，将方向阀中先导阀置于图示中间阀位(1YA和2YA均断电，此时,4个二通阀的上腔均通压力油,处于关闭状态，立柱的两腔油路也均被封闭，支架停留在某一高度位置,准备移架。
(3推溜和移架推移千斤顶的动作由插装式方向阀9控制,当将方向阀中的先导阀置于右位(4YA通电,3YA断电和左位(3YA通电,4YA断电时时,分别控制着推移千斤顶活塞杆的伸出和缩回，实现推溜和移架。推移动作完成后，将先导阀置于中位断电,4个二通阀的上腔均通压力油,处于关闭状态，推移千斤顶的两腔油路均被封闭,推移动作停止。在接到新的指令后，支架将开始下一个动作循环。
当将方向阀中的电磁先导阀换成手动阀时，即能用插装阀设计现有手动控制方式支架的液压系统,以改善支架的工作性能、提高其工作可靠性。分析表明，用插装:阀设计的电液控制支架的液压系统，能满足支架的工作要求,基于同样的原理，可用插装阀设计出所有类型和型号的液压支架的液压系统。
REXROTH插装阀盖板LFA25DBU2A2-71/315A200 R900923101
力士乐REXROTH二通插装阀、定向功能，控制盖板LFA..DBU2A
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R900522578 LFA32DBU2B2-6X/200A100
R900444245 LFA32DBU2B2-6X/200A100/12
R900378362 LFA32DBU2B2-6X/315A050
R900388225 LFA32DBU2B2-6X/315A100
R900461184 LFA32DBU2B2-6X/315A100J
R900575439 LFA32DBU2B2-6X/315A100P15F15D15
R900526014 LFA32DBU2B2-6X/315A100P15X12
R900370845 LFA32DBU2B2-6X/315A200
R900382313 LFA32DBU2B2-6X/315A200V/12
R900532898 LFA32DBU2B2-6X/420A050
R900576914 LFA32DBU2B2-6X/420A050X12F15D00
R900500369 LFA32DBU2B2-6X/420A200
R900559995 LFA32DBU2B2-6X/420A200X12F15D00
R900958948 LFA32DBU2B2-7X/100A050
R900964283 LFA32DBU2B2-7X/100A050V
R900956106 LFA32DBU2B2-7X/100A100
R901136811 LFA32DBU2B2-7X/200A100
R901125543 LFA32DBU2B2-7X/200A100V
R901213698 LFA32DBU2B2-7X/200A200
R900957503 LFA32DBU2B2-7X/200A200/12
R901419013 LFA32DBU2B2-7X/315A025
R900932398 LFA32DBU2B2-7X/315A100
R900766906 LFA32DBU2B2-7X/315A100/12
R901079052 LFA32DBU2B2-7X/315A100P15X12
R901011929 LFA32DBU2B2-7X/315A100P15X12F15D00
R900608780 LFA32DBU2B2-7X/315A100P20X20F15D00
R900932664 LFA32DBU2B2-7X/315A200
R900752249 LFA32DBU2B2-7X/315A315
R901277664 LFA32DBU2B2-7X/315A315/12
R901371030 LFA32DBU2B2-7X/420A050
R901084652 LFA32DBU2B2-7X/420A050P00
R900958978 LFA32DBU2B2-7X/420A050X12F15D00
R901260697 LFA32DBU2B2-7X/420A050X15F18
R901011537 LFA32DBU2B2-7X/420A050X15F18D00
R901113117 LFA32DBU2B2-7X/420A100
R901165502 LFA32DBU2B2-7X/420A100V
R901120032 LFA32DBU2B2-7X/420A200
R900947318 LFA32DBU2B2-7X/420A200P15X15F20D00
R901081191 LFA32DBU2B2-7X/420A315
R900955023 LFA32DBU2B2-7X/420A315/12
R978025693 LFA32DBU2B2-7X/420A50/12
R900393837 LFA32DBU2B3-6X/100A100
R901104932 LFA32DBU2B3-7X/200A100
R900565547 LFA40DBU2B1-6X/315A315
R900576112 LFA40DBU2B2-6X/100A025
R900524592 LFA40DBU2B2-6X/100A050
R900430527 LFA40DBU2B2-6X/100A050/12
R900371691 LFA40DBU2B2-6X/100A100
R900950271 LFA40DBU2B2-6X/100A100/12
R900458849 LFA40DBU2B2-6X/200A025
R900920635 LFA40DBU2B2-6X/200A050
R900527906 LFA40DBU2B2-6X/200A100
R900378790 LFA40DBU2B2-6X/200A200/12
R900378791 LFA40DBU2B2-6X/200A200V/12
R900364867 LFA40DBU2B2-6X/315A050
R900502554 LFA40DBU2B2-6X/315A050
R900582440 LFA40DBU2B2-6X/315A050P00D12
R900581622 LFA40DBU2B2-6X/315A050P00F15
R900585467 LFA40DBU2B2-6X/315A050P00F15D12
R900521844 LFA40DBU2B2-6X/315A050P15D12
R900551829 LFA40DBU2B2-6X/315A050P15F15D12
R900360636 LFA40DBU2B2-6X/315A100
R900461143 LFA40DBU2B2-6X/315A100J
R900549761 LFA40DBU2B2-6X/315A100P15F15D15
R900547689 LFA40DBU2B2-6X/315A100P24F24D24
R900573080 LFA40DBU2B2-6X/315A100P25F25D25
R900369372 LFA40DBU2B2-6X/315A200
R900368765 LFA40DBU2B2-6X/315A200V/12
R900366276 LFA40DBU2B2-6X/315A315
R900450353 LFA40DBU2B2-6X/315A315V/12
R900433756 LFA40DBU2B2-6X/400A025
R900492457 LFA40DBU2B2-6X/400A050
R900430701 LFA40DBU2B2-6X/400A100
R900910320 LFA40DBU2B2-6X/400A200
R901127884 LFA40DBU2B2-7X/100A100
R901310264 LFA40DBU2B2-7X/100A50
R901021696 LFA40DBU2B2-7X/200A025
R900712920 LFA40DBU2B2-7X/200A050
R900974681 LFA40DBU2B2-7X/200A100
R901290266 LFA40DBU2B2-7X/200A200
R900973935 LFA40DBU2B2-7X/200A200V
R900720132 LFA40DBU2B2-7X/315A050
R901168338 LFA40DBU2B2-7X/315A050P00
R901142765 LFA40DBU2B2-7X/315A050P00D00
R900969892 LFA40DBU2B2-7X/315A050P00D12
R900972611 LFA40DBU2B2-7X/315A050P00F15D12
R900969280 LFA40DBU2B2-7X/315A100
R900714781 LFA40DBU2B2-7X/315A200
R978934687 LFA40DBU2B2-7X/315A200V/12
R900722299 LFA40DBU2B2-7X/315A315
R901072181 LFA40DBU2B2-7X/400A050
R901064829 LFA40DBU2B2-7X/400A050D15
R901074834 LFA40DBU2B2-7X/400A050P00F15D12
R900970322 LFA40DBU2B2-7X/400A100
R900729306 LFA40DBU2B2-7X/400A100V
R901380355 LFA40DBU2B2-7X/400A200V
R901078802 LFA40DBU2B2-7X/400A315
R901170052 LFA40DBU2B2-7X/400P370A100
R901182300 LFA40DBU2B2-7X/400P370A200
R900527820 LFA40DBU2B3-6X/100A025V
R900461012 LFA40DBU2B3-6X/100A100
R900526638 LFA40DBU2B3-6X/200A100
R901014566 LFA40DBU2B3-7X/100A100
R901066293 LFA40DBU2B3-7X/200A100
R901114092 LFA40DBU2B3-7X/400A315
R901114097 LFA50DBU2B1-7X/050A025
R901203361 LFA50DBU2B1-7X/400A400
R900371690 LFA50DBU2B2-6X/100A100
R900551566 LFA50DBU2B2-6X/200A050
R900385339 LFA50DBU2B2-6X/315A025
R900566572 LFA50DBU2B2-6X/315A050
R900365938 LFA50DBU2B2-6X/315A050
R900557662 LFA50DBU2B2-6X/315A050P00/12
R900581527 LFA50DBU2B2-6X/315A050P00F15
R900589132 LFA50DBU2B2-6X/315A050P00F15D12
R900502550 LFA50DBU2B2-6X/315A050P15F12D12
R900551828 LFA50DBU2B2-6X/315A050P20F15D12
R900385082 LFA50DBU2B2-6X/315A100
R900549775 LFA50DBU2B2-6X/315A100P20F20
R900547721 LFA50DBU2B2-6X/315A100P25F25D25
R900559196 LFA50DBU2B2-6X/315A100V/12
R900527941 LFA50DBU2B2-6X/315A200
R900580459 LFA50DBU2B2-6X/315A315
R900551005 LFA50DBU2B2-6X/315A315P20F20D20
R900433762 LFA50DBU2B2-6X/400A025
R900526936 LFA50DBU2B2-6X/400A050
R900529441 LFA50DBU2B2-6X/400A100
R900579990 LFA50DBU2B2-6X/400A100P20F25D25
R900949045 LFA50DBU2B2-6X/400A200
R901201716 LFA50DBU2B2-7X/200A025
R901366223 LFA50DBU2B2-7X/200A050
R901358130 LFA50DBU2B2-7X/200A050/12
R901304579 LFA50DBU2B2-7X/200A100
R901028764 LFA50DBU2B2-7X/200A100F18D25
R901042047 LFA50DBU2B2-7X/200A200
R901079029 LFA50DBU2B2-7X/315A025
R901178666 LFA50DBU2B2-7X/315A025/12
R900720135 LFA50DBU2B2-7X/315A050
R901318792 LFA50DBU2B2-7X/315A050/12
R901101664 LFA50DBU2B2-7X/315A050D12
R901195223 LFA50DBU2B2-7X/315A050F12D12
R900716855 LFA50DBU2B2-7X/315A050P00
R900970324 LFA50DBU2B2-7X/315A050P00D12
R900938186 LFA50DBU2B2-7X/315A100
R901348095 LFA50DBU2B2-7X/315A100V
R900972589 LFA50DBU2B2-7X/315A100V/12
R901412292 LFA50DBU2B2-7X/315A200
R900938187 LFA50DBU2B2-7X/315A315
R900938188 LFA50DBU2B2-7X/315A50
R900954003 LFA50DBU2B2-7X/400A050
R901070180 LFA50DBU2B2-7X/400A050P00
R901084388 LFA50DBU2B2-7X/400A100
R901295840 LFA50DBU2B2-7X/400A100P25F20
R900244247 LFA50DBU2B2-7X/400A200
R901283260 LFA50DBU2B2-7X/400A200P25F20
R901405730 LFA50DBU2B2-7X/400A200V
R901081885 LFA50DBU2B2-7X/400A315
R901273678 LFA50DBU2B2-7X/400A400
R901092482 LFA50DBU2B2-7X/400P370A100
R901226479 LFA50DBU2B2-7X/400P370A100P050P25
R901092579 LFA50DBU2B2-7X/400P370A200
R900395835 LFA50DBU2B4-6X/315A50
R900911385 LFA63DBU2B2-6X/050A050
R900474867 LFA63DBU2B2-6X/315A050
R900552220 LFA63DBU2B2-6X/315A050P25
R900432214 LFA63DBU2B2-6X/315A100
R900433765 LFA63DBU2B2-6X/400A025
R900526937 LFA63DBU2B2-6X/400A050
R900529442 LFA63DBU2B2-6X/400A100
R901265081 LFA63DBU2B2-7X/025A025
R900958893 LFA63DBU2B2-7X/025A050
R900248715 LFA63DBU2B2-7X/050A050
R900707657 LFA63DBU2B2-7X/100A100
R901111089 LFA63DBU2B2-7X/200A025
R900938236 LFA63DBU2B2-7X/315A050
R900938237 LFA63DBU2B2-7X/315A100
R900963546 LFA63DBU2B2-7X/315A200
R901147543 LFA63DBU2B2-7X/315A315
R900954553 LFA63DBU2B2-7X/400A050
R901070185 LFA63DBU2B2-7X/400A050P00
R901083033 LFA63DBU2B2-7X/400A050P15
R901270963 LFA63DBU2B2-7X/400A100/12
R901295736 LFA63DBU2B2-7X/400A100P30
R901211050 LFA63DBU2B2-7X/400A200
R901265909 LFA63DBU2B2-7X/400A200P30
R900978681 LFA63DBU2B2-7X/400A315
R901226464 LFA63DBU2B2-7X/400P285A100P050P30
R901267750 LFA63DBU2B2-7X/400P285A200P165P30
R901262139 LFA63DBU2B2-7X/400P315A100P050P30
R901219493 LFA63DBU2B2-7X/400P330A100P080P30
R901179783 LFA63DBU2B2-91-7X/400A200P30
R900905520 LFA80DBU2B2-6X/200A200
R900777443 LFA80DBU2B2-6X/315A050
R900952620 LFA80DBU2B2-6X/315A050/12
R900979352 LFA80DBU2B2-6X/315A100
R900734845 LFA80DBU2B2-6X/315A200
R901031301 LFA80DBU2B2-6X/400A100
R900738000 LFA80DBU2B2-6X/400A200P20X15/12
R978914410 LFA25DBU2B2-7X/100A050/12
R988004117 LFA25DBU2B3-7X/050A025
R978912819 LFA32DBU2B2-7X/100A050/12
R978911932 LFA40DBU2B2-7X/100A050/12
R978015718 LFA40DBU2B2-7X/315A025/12
R978918090 LFA40DBU2B2-7X/315A050/12
R978916606 LFA40DBU2B2-7X/315A100V/12
R987056309 LFA50DBU2B2-7X/315A050F15P00
R978935146 LFA50DBU2B2-7X/315A05P00
R978918089 LFA50DBU2B2-7X/315A100/12
R901223489 LFA50DBU2B2-7X/400P285A200P050P25F20
R901263081 LFA50DBU2B2-7X/400P285A200P080P25F20
R901262135 LFA50DBU2B2-7X/400P285A200P165P25F20
R901219476 LFA50DBU2B2-7X/400P330A100P080P25F20
力士乐REXROTH二通插装阀、压力作用，控制盖板LFA..DBU3D
R901186308 LFA100DBU3D2-126-6X/400A000B100
R901403928 LFA100DBU3D2-6X/315A025B200
R900975314 LFA100DBU3D2-6X/400A100B025
R900951048 LFA100DBU3D2-6X/400A400B050
R901012382 LFA16DBU3D1-7X/420A200B050
R901311794 LFA16DBU3D2-126-7X/420A000B200
R901311793 LFA16DBU3D2-126-7X/420A000B420-350
R900905519 LFA16DBU3D2-6X/100A100B100
R900384016 LFA16DBU3D2-6X/100A100B50
R900586188 LFA16DBU3D2-6X/200A100B100
R900382257 LFA16DBU3D2-6X/200A50B50V/12
R900521944 LFA16DBU3D2-6X/315A050B100
R900920693 LFA16DBU3D2-6X/315A200B200
R900518863 LFA16DBU3D2-6X/315A315B050
R900512516 LFA16DBU3D2-6X/315A315B315
R900504637 LFA16DBU3D2-6X/420A200B050
R900589193 LFA16DBU3D2-6X/420A420B200
R900946081 LFA16DBU3D2-7X/100A100B100
R900944052 LFA16DBU3D2-7X/100A100B100/12
R901176519 LFA16DBU3D2-7X/100A50B50
R901079563 LFA16DBU3D2-7X/200A050B050
R900712883 LFA16DBU3D2-7X/200A100B050
R900978773 LFA16DBU3D2-7X/200A100B100
R900936789 LFA16DBU3D2-7X/200A200B200
R900950459 LFA16DBU3D2-7X/315A200B100
R901129741 LFA16DBU3D2-7X/315A315B025
R901122162 LFA16DBU3D2-7X/315A315B200
R901263961 LFA16DBU3D2-7X/315A315B200/12
R900951922 LFA16DBU3D2-7X/315A315B315
R900925356 LFA16DBU3D2-7X/420A200B200
R901084645 LFA16DBU3D2-7X/420A420B100
R901444578 LFA16DBU3D2-7X/420P350A200B420
R900521701 LFA25DBU3D1-6X/315A050B050
R900526063 LFA25DBU3D1-6X/315A100B100
R900504564 LFA25DBU3D1-6X/315A100B315
R900594754 LFA25DBU3D1-6X/315A200B200
R901346062 LFA25DBU3D1-7X/315A025B200
R901081996 LFA25DBU3D1-7X/315A050B025
R900732492 LFA25DBU3D1-7X/315A100B100
R901044196 LFA25DBU3D1-7X/315A100B315
R900740689 LFA25DBU3D1-7X/315A200B050
R900932975 LFA25DBU3D1-7X/315A200B100
R901258040 LFA25DBU3D2-126-7X/200-120A000B100-050
R901192329 LFA25DBU3D2-126-7X/200A000B050
R900734740 LFA25DBU3D2-126-7X/200A000B100
R900746935 LFA25DBU3D2-126-7X/200A100B000
R900727693 LFA25DBU3D2-126-7X/315A000B100
R900762869 LFA25DBU3D2-126-7X/315A000B200
R901069293 LFA25DBU3D2-126-7X/420-285A000B200
R901189420 LFA25DBU3D2-126-7X/420-285A000B200-160
R901145830 LFA25DBU3D2-126-7X/420-285A200B000
R901031645 LFA25DBU3D2-126-7X/420A000B100
R900763975 LFA25DBU3D2-126-7X/420A000B200
R900432954 LFA25DBU3D2-6X/200A200B200/12
R900434134 LFA25DBU3D2-6X/315A050B100
R900585575 LFA25DBU3D2-6X/315A200B100
R900595947 LFA25DBU3D2-6X/315A200B100X00D00
R900457665 LFA25DBU3D2-6X/315A200B200
R900516335 LFA25DBU3D2-6X/315A200B200X00D00
R900484523 LFA25DBU3D2-6X/315A200B315
R900581711 LFA25DBU3D2-6X/315A315B315
R900910315 LFA25DBU3D2-6X/420A050B050
R901340465 LFA25DBU3D2-7X/100A025B025
R901104929 LFA25DBU3D2-7X/100A050B025
R900942896 LFA25DBU3D2-7X/100A050B050
R901020619 LFA25DBU3D2-7X/200A050B050
R901320724 LFA25DBU3D2-7X/200A050B200
R901138308 LFA25DBU3D2-7X/200A100B050
R900978772 LFA25DBU3D2-7X/200A100B100
R900784206 LFA25DBU3D2-7X/200A100B200
R901211743 LFA25DBU3D2-7X/200A100B200/12
R901004516 LFA25DBU3D2-7X/315A050B050
R901364688 LFA25DBU3D2-7X/315A100B025
R900249648 LFA25DBU3D2-7X/315A100B200
R901081788 LFA25DBU3D2-7X/315A200B100
方向控制阀
方向控制阀用于控制或调节液压系统或回路中方向及其通和断,从而控制执行元件的
运动方向及其启动、停止的阀。如单向阀、换向阀等;
大型钢厂现场采用的主要方向控制阀，如:电磁换向阀、手动换向阀、电液换向阀、单向阀、方向插件，插装阀。
3、4WEH..型方向阀
型号4WEH..型方向阀WEH型方向阀是-种电液操作的方向滑阀。它们用于控制液流的开启、停止和方向。
此类阀组成主要包括阀体( 1 )主控制阀芯(2 )一个或两个复位弹簧( 3.1 )和(3.2 ),带一个或两个电磁铁:电磁铁"a” (5.1 ),电磁铁"b" (5.2 )的先导阀(4)。
主阀阀芯由弹簧或液压力保持在中位或初始位置。在初始位置, 两个弹簧腔( 6 )和( 8 )通过先导阀无压的油箱连通。经过控制油路(7 )向先导阀(4)供油。控制泊可以由内部或外部供给( 外部供给油口X )当先导阀操作时,如电磁铁"a”得电,先导滑阀(10)向左移动,因此弹簧腔(8)获得先导油压力而弹簧腔(6)保持无压状态。
先导压力施压于主阀芯的左端, 并克服弹簧力( 3.1),其结果,主阀的P至B和A至T被接通。当电磁铁断电,先导阀回复至初始位置(带定位机构滑阀除外),弹簧腔( 8 )向油箱卸荷。
控制油从弹簧腔经先导阀排入Y口。控制油可内部或外部供油和回油外部经油口Y )可选择的应急手动操作( 9 ),在电磁铁不通电情况下,可对先导滑阀( 10 )进行操作。
2、LC..型二通插装阀
二通插装阀设计成插件结构, 用于整体集成块。带油口A和B的主阀组件插入控制块上尺寸符合DIN ISO 7368标准的插孔,并用控制盖板封闭。在大多数情况下,盖板的作用,就是作为主阀组件控制侧与先导阀之间的连接件。采用适合的先导阀来控制主阀，主阀组件能承担压力、方向或者节流功能、或它们的组合功能。通过不同通径的阀和执行器独特的流量变化需要相匹配,可以实现特殊的经济型结构设计。如果主阀组件能承担一种以上的功能,特殊的经济型结构就能达到。
方向功能
二通插装阀的基本组成主要包括控制盖板( 1 )和插件(2 )控制盖板含有控制孔、根据功能需要可选择的行程限位器、液压控制的方向座阀或梭阀。另外,方向滑阀或方向座阀可以安装在控制盖板的上面。插件的组成主要包括阀套(3 )调整圈( 4 )(仅适用至通径32)座阀(5)可选择带阻尼锥颈(6)或不带阻尼锥颈(7)以及复位弹簧(8)
功能说明
二通插装阀的驱动取决于压力。因此对阀的驱动，这里有三个重要的承压面积: A1, A2, A3阀座的面积( A1 )作为100%、根据类型环形面积( A2 )为面积( A1的7%或50%。因此面积比A1:A2或是14,3:1 ,或是2:1。面积( A3 )等于A1 + A2。由于A1:A2面积比不同,因此,环形面积A2也不同。面积A3在阀座面积A1为100%时，可能是107%,也可能是150%。
基本应用:
面积A1和A2的作用在阀开启方向。面积A3和弹簧的作用在阀关闭方向。合成力的有效方向(开启力或关闭力) 决定了两通插装阀的开关状
态。二通插装阀的流动方向可以从A至B ,也可以从B至A.如果作用于面积A3的控制压力来自油口B或者控制油由外部供给,油口A则关闭,且无泄漏。

四、流量控制阀
流量控制阀用于控制或调节液压系统或回路中工作液体流量大小的阀。如节流阀、调速阀、分集流阀等
大型钢厂现场采用的主要流量控制阀，如：二通流量控制阀、叠加式流量控制阀、双单向节流阀，单向阀、节流阀、液压锁。
1、Z2FS...型双单向节流阀
1.结构分析
Z2FS16型阀是叠加式设计的双路单向节流阀。该阀用于限制来自一个或两个工作油口的主流量或控制流量。
两个对称设置的单向节流阀在一个方向上限定流量,(通过调整节流阀芯),在相反方向上允许自由流通。用于进口节流控制时, 油液从油口A流经节流口( 1 )到达工作油口。节流阀芯( 4.1 )可借助于调节螺钉( 5 )进行轴向调整,从而可以设定节流口(1 )同时,油口A中的油液通经道( 2 )到节流阀芯( 4.1 )的弹簧加载侧(3 )产生的压力与弹簧
共同作用,使节流阀芯( 4.1 )保持在节流位置,
油液从执行器回流推动节流阀芯( 4.2 ),允许油液自由流过。此时阀作为单向阀工作。根据型号(S或S2 ),节流口可以起进口或出口节流的控制作用。限制主流量为了改变执行器的速度(主流量限制),双路单向节流阀是而安装于方向控制阀和底板之间。限制控制流量对液控方向阀,双路单向节流阀用作控制阻尼调节,在此情况下,它被安装于主阀和控制阀之间。

五、比例控制阀
采用比例电磁铁(或力矩马达)将输入信号转换成力或阀的机械位移，使阀的输出(压力、流量)也按照其输入量连续、成比例地进行控制的阀。
大型钢厂现场使用的比例阀主要有下表中的几种:伺服比例控制阀、比例控制阀、电液比例控制阀，比例阀，伺服阀。
1、4WRD E..型比例伺服控制阀(高频响阀)
结构和功能
4WRDE型阀是三级高频响方向阀。该阀可用于开环控制或闭环调节液流的大小和方向，但主要用于闭环调节回路中。
阀主要由下列部分组成:
1.二级先导控制阀由力矩马达( 1 )和由喷嘴挡板阀构成的液压放大器( 5),和用作流量放大级的阀芯衬套组件(6 )(用以控制第三级(7 ))组成。
2.第三级(7)用于流量控制。
3.感应式位移传感器( 8),连接第三级主阀芯( 10)的磁芯(9 )
通过内置电子放大器实现阀闭环控制信号逻辑连接,位置检测系统反馈,和先导阀的控制。
给定值/实际值比较得到的差动电压经过电子控制器放大, 并作为控制偏差量传递到阀的一级。这个信号推动两个控制喷嘴( 3.1, 3.2) 之间的挡板( 2)因而在两个控制腔(11.1.11.2)产生了压差。控制阀芯(4 )因此被推动,并通过相应的液流流到弹簧腔(12.1or12.2)阀芯(10)和带磁芯(9)的位移传感器(8)-直运动,直到实际值和给定值信号再一次相等。在控制条件下;主阀芯( 10 )一直被保持在给定值所对应的位置。
阀芯行程和给定值成正比。通过阀芯( 10 )相对于控制边( 13 )的位置,形成相应的与流量成正比的阀口开度。
阀的动态特性通过电子放大器优化。电子放大器内置于阀上(振荡器,解调器)
零点调节由厂家预先设定,通过闭环控制电子放大器内的电位器, 零点能在名义行程士10%范围内调整。移去阀盖尾部的插头,可以对内置闭环电子放大器进行操作。