压力补偿阀基本原理根据压力补偿阀布置在整个液压油路中的位置，负载压力补偿控制系统还可以分为阀前压力补偿负载系统和阀后压力补偿负载系统。阀前补偿是指压力补偿阀布置在油泵与纵阀之间，阀后补偿是指压力补偿阀布置在纵阀与执行机构之间。阀后补偿比阀前补偿要先进，主要体现在泵供油不足的情况下。如果泵供油不足的话，阀前补偿的主阀，导致的结果是向轻载去的流量多，重载去的流量少，就是轻载动得快，复合动作时，各个执行元件不同步。而阀后补偿没有这个问题，会比例分配泵所提供的流量，复合动作时使各个执行元件同步。负荷传感系统分阀前补偿和阀后补偿，当有两个或两个以上的负载同时动作时，如果主泵提供的流量足够满足系统所需流量，阀前补偿和阀后补偿的作用是一样的；如果主泵提供的流量无法满足系统所需流量，那么阀前补偿的那种情况是：主泵流量往负荷小的负载提供流量，当满足完了负荷小的负载的流量要求时，才往其他的负载供流量；而阀后补偿的情况是：同比（阀开口量）减少各个负载的流量供给，达到动作很协调。即：主泵提供的流量无法满足系统所需流量时，阀前补偿的流量分配与负载有关，而阀后补偿的流量分配与负载无关，只与主阀的开口量有关。
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力士乐压力补偿器
