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力士乐电液比例阀简称力士乐比例阀R900750717 4WRDE25V350L-53/6L24K9/WG152M。普通液压阀只能通过预调的方式对液流的压力、流量进行定值控制。R900750717 4WRDE25V350L-53/6L24K9/WG152M但是当设备机构在工作过程中要求对液压系统的压力、流量参数进行调节或连续控制，例如.要求工作台在工作进给时按慢、快、慢连续变化的速度实现进给，或按一定精度模拟某个最佳控制曲线实现旅力控制.普通液压阀则实现不了。这时可以用电液比例阀对液压系统进行控制。
力士乐比例阀R900750717 4WRDE25V350L-53/6L24K9/WG152M是一种按输入的电信号连续地、按比例地控制液压系统的液流方向、流量和压力的阀类。它山电-机械比例转换装置和液压控制阀本体两大部分构成.前者将输入的电信号连续地按比例地转换为机械力和位移输出，后者在接受这种机械力和位移之后、按比例连续地输出压力和流量.力士乐比例阀的发展主要有两个途径一是用比例电磁铁取代传统液压阀的手动调节装置或取代普通电磁铁发展起来的;二是由电液伺服阀简化结构、降低精度发展起来的。
设计中就使比例电磁铁的衔铁在这段行程中工作。因此。改变线圈中的电流，即可在衔铁上得到与其成正比的吸力。用比例电磁铁代替螺旋手柄来调整液压阀，就能使输出乐力或流量与输人电流对应成比例地发生变化。
力士乐比例阀用于模拟控制，是介于普通开关控制与伺服控制之间的控制方式，它也特别适合于设备的革新或改造。使设备自动化控制水平大为提高。其在现代液雌系统中占比例很大。
与普通液压阀相比.力士乐比例阀的优点是:①能简单地实现远距离控制:②能连续地、按比例地控制液压系统的压力和流量。从而实现对执行机构的位置、速度和力的连续控制，并能防止或减小压力、速度变换时的冲击;③油路简化，元件数量少。
力士乐比例阀适用于既要求能连续控制胀力、流量.和方向.而又不需要很I的控制精度的场合。
力士乐比例阀也分为压力阀、流量阀和方向阀几大类。
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