德国力士乐Rexroth伺服阀4WS2EM6-2X/5B12ET210K17EV

电液伺服阀广泛地应用于电液位置,速度,加速度,力伺服系统,以及伺服振动发生器中.它具有体积小,结
伺服阀
构紧凑,功率放大系数高,控制精度高,直线性好,死区小,灵敏度高,动态性能好以及响应速度快等优点.
参考书目 刘长年著《液压伺服系统的分析与设计》，科学出版社，北京，1985。
4类型
[1] 防滞伺服活门
该伺服阀属于两级阀，*级为喷嘴档板式，由控制信号控制其出口压力，第二级为滑阀式，执行控制级至刹车缸的压力。当无信号作用时， 由於压力喷嘴出口油压力的作用，使伺服阀挡板靠在回油喷嘴上，此时压力口的油压作用在滑阀阀芯上，使刹车口同计量油口直接连通，刹车口压力同飞行员控制的计量油压相等，当机轮角速度检测到滑行速度同基准滑行速度有偏差时，力矩马达接收到偏差电信号，此时力矩马达驱动档板向压力喷嘴偏转，使作用在阀芯上端油压下降，在阀芯下端油压作用下，阀芯上移，关小计量压力油口，这将导致控制口压力降低，控制口压力降低到某一值时，就有对应的制动压力。[1] 
5空难
1991年3月3日，联合航空585号班机为波音737-291型客机，从丹佛机场前往科罗拉多泉机场途中，飞机垂直尾翼的方向舵突然不受控制转向右面，继而翻滚，之后直坠地面，机上20名乘客和5名机组人员全部遇难。
1994年9月7日，全美航空427号班机为波音737-300型客机，从芝加哥奥黑尔机场前往匹兹堡机场途中，突然不受控制转向，继而翻滚，之后直坠地面，机上127名乘客和5名机组人员全部遇难。它的坠机方式与联合航空585号班机与东风航空517号很相似。其后发现原来波音737客机的方向舵液压器在温差很大时（30,000呎的-50度到地面的30度，同时加入高温液压液体时）会卡住，并且会导致飞行员给方向盘控制后由反向偏转的严重后果。这种故障不会有磨损过的痕迹，也是NTSB（National Transportation Safety Board）有史以来调查时间zui长的一系列空难事故之一。这是波音737自运行以来发现的zui大的致命设计错误（国家地理《空中浩劫》中S04E04中详述）。
1996年6月9日，东风航空517号班机于准备降落在里奇蒙机场时，飞机突然发生故障，所幸只有一名空中服务员受轻伤。飞机亦成功降落。

德国力士乐Rexroth伺服阀4WS2EM6-2X/5B12ET210K17EV

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