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阀类：电磁阀、换向阀、单向阀、溢流阀、减压阀、平衡
阀、插装阀、比例阀等
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武穴黎翔机电设备有限公司REXROTH力士乐销售部
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德国rexroth溢流阀是一种液压压力控制阀。在液压设备中主要起定压溢流作用,稳压,系统卸荷和安全保护作用。 定压溢流作用:在定量泵节流调节系统中,定量泵提供的是恒定流量。当系统压力增大时,会使流量需求减小。此时溢流阀开启,使多余流量溢回油箱,保证溢流阀进口压力,即泵出口压力恒定(阀口常随压力波动开启)。
稳压作用:溢流阀串联在回油路上,溢流阀产生背压运动部件平稳性增加。
系统卸荷作用:在溢流阀的遥控口串接溢小流量的电磁阀,当电磁铁通电时,溢流阀的遥控口通油箱,此时液压泵卸荷。力士乐溢流阀此时作为卸荷阀使用。
安全保护作用:系统正常工作时,阀门关闭。只有负载超过规定的极限(系统压力超过调定压力)时开启溢流,进行过载保护,使系统压力不再增加(通常使溢流阀的调定压力比系统最高工作压力高10%~20%)。
实际应用中一般有:作卸荷阀用,作远程调压阀,作高低压多级控制阀,作顺序阀,用于产生背压(串在回油路上)。
rexroth溢流阀一般有两种结构:1、直动型溢流阀 。2、先导型溢流阀。
对溢流阀的主要要求:调压范围大,调压偏差小,压力振摆小,动作灵敏,过载能力大,噪声小。
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,下面还要配一个大通径的溢流阀。
力士乐电磁溢流阀和比例溢流阀功能上区别不是太大,都是在系统压力超过设定值时开启卸压、溢流;不同的是,比例溢流阀可以按比例调定溢流的流量,对系统的控制更加精密。普通的溢流阀就是开启和关闭两个位置,比例阀在开启溢流时可以有多个位置。
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