Rexroth力士乐比例溢流阀DBETR-10/315G24K4M原厂比例阀溢流阀

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德国博世力士乐比例阀，力士乐比例伺服阀
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DBET比例溢流阀，后续E带集成电控器或无代号外接；6X系列;
5种压力等级：50,100,200.315,350bar；电控器电源G24；用于DBET两种电气连接：K4，K31不包括插头；用于DBETE放大板接口A1，F1；密封材料氟橡胶；
DBETE内部集成式电控器：制造误差引起的设定值-压力特性曲线偏差比较小；CE带有集成式电控器的EBETE的EMC电磁兼容性指导89/336/；
型号EBET内置电控器（单独订购）模块化设计，欧洲卡规格的模拟放大板；压力增加，减小的斜坡型号产生时间可调；在线控器上可以外部校准指令值-压力的特性曲线。

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比例溢流阀工作原理是：比例溢流阀通过弹簧力的大小改变溢流压力大大小变化，比例电磁铁作用在弹簧上的力可以按比例调整，所以就输入信号变化比例溢流阀的压力也会变化。

普通溢流阀与比例溢流阀一样，都有一个阀芯，阀芯的一端是液压油产生的压力，另一端是机械力。普通溢流阀通过调节弹簧力，来调整液压压力。而比例溢流阀是电磁铁直接产生推力，作用在阀芯上，电磁铁上的输入电压可以在0-24伏之间变化，产生的推力就随之变化，从而得到连续变化的液压压力。

因为比例电磁铁的推力不大，所以直动式比例溢流阀的流量很小，压力70兆帕时，流量只有1升/分钟左右。需要大流量比例阀的时候，要把这个比例阀做先导阀，还要配一个大通径的溢流阀

由于各种原因，空气被吸入油液中，或者在油液压力低于大气压时，溶解在油液中的部分空气就会析出形成气泡，这些气泡在低压区时体积较 大，当随油液流到高压区时，受到压缩，体积突然变小或气泡消失；反之，如在高压区时体积本来较小，而当流到低压区时，体积突然增 大，油中气泡体积这种急速改变的现象。

比例溢流阀的故障及其解决方法
比例滋流润是能够与电气信号成比例的控制压力的阀。它主要是由作为电—力转换器的比例电磁铁、力矩马达、力马达和作为力—液压转换器的先导阀。喷嘴挡板阀等组成。这里主要对比例电磁铁和先导阔组成的比例先导阀的故障进行分析。而对比例控制平衡活塞式滋流阀不做叙述。(关于比例控制平衡活塞式溢流阀的故障分析，与前面有关普通平衡活塞式滥流阀的故障分析基本一致)。
如果控制压力发生故障，那么先用电流表检查电流值。断定究竟是包括电磁铁的控制电路有问题，还是平衡活塞式阀有问题，然后再根据具体情况体对待。下面给出各种故障现象，然后分析产生故障的原因和解决方法。
(一)虽然流过电磁铁的电流为额定值，但压力完全上不去，或得不到所需压力。
原因1，比例先导阀的先导阀口沽上大粒污垢，保持一个大开口，因此压力上不去。解决方法是拆开清洗。
原因2，进行摇控的场合，一般平衡活塞式溢流阀的调压手轮放松时压力就降低，而整体式比例控制平衡活塞式溢流阀，假如安全阀调整螺丝放松，也同样会降低设定压力。解决方法是将该压力设定到超过压力24kgf/cm2左右，使其经常保持关闭状态。若压力设定过低，则接近工作压力时，先导流量就会同时从安全阀和比例微导阀两处流出，得不到所需压力。
(二)流过电磁铁的电流已经过大，但压力还是不上，或得不到所要求的压力。
原因1,检查电磁铁线圈电阻，若远小于规定值，那是电磁铁线圈内部短路了。
原因2，电磁铁线圈电阻正常，此时是接放大器的连线短路。这两种原因的解决方踌是更换电磁铁或连线。
(三)电磁铁没有电流流过，压力也上不去。
原因1，检查电磁铁线圈电阻为无限大，这是线圈断了或电磁铁引线脱焊了。解决方法是更换电磁铁线圈或焊好电磁铁引线。
原因2，电磁铁接插件松动，接触不良。解决方法是拧紧插接件。
原因3，打开接插件，接线脱开了。解决方法是更换连线，或把断线接上。
原因4，放大器和电磁铁间连线断开，或放大器端子接线脱开了。解决方法是更换连线，或把断线接上。
原因5，放大器及设定器出故障。
(四)使压力阶跃变化时，小振幅的压力波动不断，设定压力不稳定。
原因，电磁铁的导向部分和铁芯表面附着污垢，妨碍铁芯的运动。另外，主阀芯滑动部分沽有污垢，妨碍主阀芯的运动，由于这些污垢的影响，滞回增 大了。在滞回的范围内，压力不稳定。压力波动不断。解决方法是拆开并清洗阀和电磁铁。检查液压油的污染度，如超过规定就要换油。
(五)压力响应缓慢。
原因1，电磁铁铁芯上设置的阻尼用固定节流孔及主阀芯节流孔被污垢堵住，电磁铁铁芯及主阀芯的运动受到不必要的阻碍。解决方法是拆开并清洗阀和电磁铁。检查液压油的污染度，如超过规定就要换油。
原因2，没流阀正常，可是液压缸、管路的容积大，有空气混入。通常发生设备刚装好后开始运转时或长期停机后有空气混人的场合。解决方法:阶跃响应时间是随着负载容积变化的。负载容积大则响应时间长，因此，在和样本值做比较时，要注意负载容积。空气容易集中在油路较高部位，液压缸中的空气不易排出，设置放气阀。