电液比例阀4WEH22D76/6EG24N9EK4力士乐电液阀是由一个主阀和两个电磁阀组成，主阀响应速度的控制是两个柱塞阀，安装于主阀的入口和出口。通过两个柱塞阀细微调节主阀的启闭速度。调整这些装置（柱塞阀）以控制流入和流出活塞上方介质的流量。达到主阀启闭速度能基于介质的粘度及压力调整的目的。
常开（N.O）和常闭（N.C）电磁阀分别安装在主阀的进油回路和出油回路中，用于控制主阀的动作，当两电磁阀通电时，进油孔（上游阀）回路关闭，先导孔（下游阀）回路打开，活塞上腔泄压，活塞上行，主阀打开。反之，活塞下行，主阀关闭。在主阀开启和关闭过程中，可将流量（流速）信号及阀塞位置信号传送给计算机，经过计算机处理后发出相应的指令，控制两个电磁导阀的通、断电状态，使活塞的上下腔的液压差产生变化，从而将活塞控制在所需的开启度上，实现对管道介质流量的控制。
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电液比例阀4WEH22D76/6EG24N9EK4力士乐
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COUPLING PVH57
COUPLING, C PVH57
BIAS ROD - PVH131
CONTROL PISTON -PVH131/141
CONTROL ROD - PVH131/141
VALVE PLATE (LH) PVH131
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DRIVE SHAFT - PVH57
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