德國(guó)Rexroth 比例伺服閥4WS2EM10-4X/20B2ET315K8EM

電液伺服閥廣泛地應(yīng)用于電液位置,速度,加速度,力伺服系統(tǒng),以及伺服振動(dòng)發(fā)生器中.它具有體積小,結(jié)
伺服閥
構(gòu)緊湊,功率放大系數(shù)高,控制精度高,直線性好,死區(qū)小,靈敏度高,動(dòng)態(tài)性能好以及響應(yīng)速度快等優(yōu)點(diǎn).
參考書目 劉長(zhǎng)年著《液壓伺服系統(tǒng)的分析與設(shè)計(jì)》，科學(xué)出版社，北京，1985。
4類型
[1] 防滯伺服活門
該伺服閥屬于兩級(jí)閥，*級(jí)為噴嘴檔板式，由控制信號(hào)控制其出口壓力，第二級(jí)為滑閥式，執(zhí)行控制級(jí)至剎車缸的壓力。當(dāng)無信號(hào)作用時(shí)， 由於壓力噴嘴出口油壓力的作用，使伺服閥擋板靠在回油噴嘴上，此時(shí)壓力口的油壓作用在滑閥閥芯上，使剎車口同計(jì)量油口直接連通，剎車口壓力同飛行員控制的計(jì)量油壓相等，當(dāng)機(jī)輪角速度檢測(cè)到滑行速度同基準(zhǔn)滑行速度有偏差時(shí)，力矩馬達(dá)接收到偏差電信號(hào)，此時(shí)力矩馬達(dá)驅(qū)動(dòng)檔板向壓力噴嘴偏轉(zhuǎn)，使作用在閥芯上端油壓下降，在閥芯下端油壓作用下，閥芯上移，關(guān)小計(jì)量壓力油口，這將導(dǎo)致控制口壓力降低，控制口壓力降低到某一值時(shí)，就有對(duì)應(yīng)的制動(dòng)壓力。[1] 
5空難
1991年3月3日，聯(lián)合航空585號(hào)班機(jī)為波音737-291型客機(jī)，從丹佛機(jī)場(chǎng)前往科羅拉多泉機(jī)場(chǎng)途中，飛機(jī)垂直尾翼的方向舵突然不受控制轉(zhuǎn)向右面，繼而翻滾，之后直墜地面，機(jī)上20名乘客和5名機(jī)組人員全部遇難。
1994年9月7日，全美航空427號(hào)班機(jī)為波音737-300型客機(jī)，從芝加哥奧黑爾機(jī)場(chǎng)前往匹茲堡機(jī)場(chǎng)途中，突然不受控制轉(zhuǎn)向，繼而翻滾，之后直墜地面，機(jī)上127名乘客和5名機(jī)組人員全部遇難。它的墜機(jī)方式與聯(lián)合航空585號(hào)班機(jī)與東風(fēng)航空517號(hào)很相似。其后發(fā)現(xiàn)原來波音737客機(jī)的方向舵液壓器在溫差很大時(shí)（30,000呎的-50度到地面的30度，同時(shí)加入高溫液壓液體時(shí)）會(huì)卡住，并且會(huì)導(dǎo)致飛行員給方向盤控制后由反向偏轉(zhuǎn)的嚴(yán)重后果。這種故障不會(huì)有磨損過的痕跡，也是NTSB（National Transportation Safety Board）有史以來調(diào)查時(shí)間zui長(zhǎng)的一系列空難事故之一。這是波音737自運(yùn)行以來發(fā)現(xiàn)的zui大的致命設(shè)計(jì)錯(cuò)誤（國(guó)家地理《空中浩劫》中S04E04中詳述）。
1996年6月9日，東風(fēng)航空517號(hào)班機(jī)于準(zhǔn)備降落在里奇蒙機(jī)場(chǎng)時(shí)，飛機(jī)突然發(fā)生故障，所幸只有一名空中服務(wù)員受輕傷。飛機(jī)亦成功降落。

德國(guó)Rexroth 比例伺服閥4WS2EM10-4X/20B2ET315K8EM

4WS2EM10-5X/75B11ET315K31EV
4WS2EM10-90/75B2ET315CAM
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R900618307 4WS2EM10-5X/20B11-210K31EV
R900617993 4WS2EM6-2X/20B12ET210K17EV
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R900584270 4WS2EM10-4X/10B3ET315K8AV-7
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R901136727 4WSE2EM6-2X/15B9ET210K17EV
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R901129427 4WSE3EE16-1X/0B8-315K9DV-132
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R901128713 4WSE2ED10-5X/30B8-315K31EV-121
R901128712 4WSE2ED10-5X/75B8-315K31EV-116
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R901125423 4WSE3EE16-1X/300B8-315K9DV-122
R901122489 4WSE3EE25-2X/400B8-315K9DV-122
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R901116633 4WS2EM10-5X/5B11XHET315K31EV-100
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R901114271 4WS2EM10-5X/45B11T315K8CV-104
R901113388 4WS2EM10-5X/30B11ET315K8DV

R901112369 4WSE3EE16-1X/300B9ET315K9DM-127
R901111502 4WSE3EE25-2X/500B8ET210K9EV-129
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R901103913 4WSE2EE10-4X/60B8ET315K9EV-73
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R901030788 4WS2EM16-2X/150B12T315K8CV
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R901007772 4WS2EM6-2X/20B11XNET315K17EV-100
R901007771 4WS2EM10-5X/60B11XNT315K31CV-114
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R901007741 4WSE2ED10-5X/30B13T315K9EV
R901006867 4WS2EM10-5X/45B11ET210K8AV
R901006460 4WSE3EE16-1X/100B8-315K9EV-120
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R901004485 4WS2EM6-2X/0B12ET315K17EV-113
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R901003007 4WS2EM10-5X/20B11ET315K31AV
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R900977215 4WS2EB10-4X/5B2ET40K8AV
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R900972857 4WSE2ED10-5X/60B13-315K31EV
R900972795 4WS2EB10-4X/10B1-70K8AV
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R900971769 4WSE3EE16-1X/200B9ET315K9EV
R900971159 4WS2EM6-2X/2B12ET315K17EV
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R900969969 4WS2EB10-4X/45B2ET210K8AV
R900969967 4WS2EB10-4X/60B2-140K8BV
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R900967562 4WS2EB10-4X/10B2ET40K8AV
R900967548 4WS2EM10-4X/45B3T315K8CV
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R900966344 4WS2EM10-4X/45B3T315K8CV-94
R900966097 4WS2EM16-2X/150B12T315K8EV
R900966039 4WS2EM10-4X/20B2T315K8EV
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R900965141 4WS2EM10-4X/75B2T315K8DV
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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
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R900960157 4WSE2ED16-2X/100B9T315K9EV
R900959626 4WSE3EE16-1X/100B8T315K9EV
R900958815 4WS2EM10-4X/30B1ET315K8BV

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