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。
1.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）。
2.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
3. 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。溢流阀此时作为卸荷阀使用。
4.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。
德国力士乐比例溢流阀部分型号：
带位置反馈比例溢流阀DBETBX DBETBEX
0811402013 DBETBX-1X/28G24-37Z4M
0811402003 DBETBX-1X/180G24-37Z4M
0811402004 DBETBX-1X/315G24-37Z4M
带集成放大位置反馈比例溢流阀 DBETBEX
0811402072 DBETBEX-1X/80G24K31A1M
0811402071 DBETBEX-1X/180G24K31A1M
0811402073 DBETBEX-1X/250G24K31A1M
0811402070 DBETBEX-1X/310G24K31A1M
0811402140 DBETBEX-1X/80G24K31F1M
0811402075 DBETBEX-1X/180G24K31F1M
0811402141 DBETBEX-1X/315G24K31F1M
比例溢流阀DBETX
0811402036 DBETX-10/50G24-8NZ4M
0811402018 DBETX-10/80G24-8NZ4M
0811402017 DBETX-10/180G24-8NZ4M
0811402019 DBETX-10/250G24-8NZ4M
0811402016 DBETX-10/315G24-8NZ4M
0811402034 DBETX-10/50G24-25NZ4M
0811402030 DBETX-10/80G24-25NZ4M
0811402031 DBETX-10/180G24-25NZ4M
0811402035 DBETX-10/250G24-25NZ4M
0811402032 DBETX-10/315G24-25Z4M
比例溢流阀DBEP DBET DBETE
R901000842 DBET-6X/50G24K4V
R901000845 DBET-6X/100G24K4V
R901000846 DBET-6X/200G24K4V
R901000847 DBET-6X/315G24K4V
R901000848 DBET-6X/350G24K4V
R901029966 DBETE-6X/50G24K31A1V
R901029967 DBETE-6X/100G24K31A1V
R901029968 DBETE-6X/200G24K31A1V
R901029969 DBETB-6X/315G24K31A1V
R901029970 DBETB-6X/350G24K31A1V
比例溢流阀DBETR
R900954438 DBETR-1X/30G24K4M
R900334966 DBETR-1X/80G24K4M
R900491698 DBETR-1X/180G24K4M
R900370146 DBETR-1X/230G24K4M
R900485944 DBETR-1X/315G24K4M
R900352424 DBETR-1X/350G24K4M
先导式比例溢流阀DBE6X型
0811402045 DBE6X-1X/80G24-8NZ4M
0811402044 DBE6X-1X/180G24-8NZ4M
0811402043 DBE6X-1X/315G24-8NZ4M
0811402040 DBE6X-1X/80G24-25NZ4M
0811402041 DBE6X-1X/180G24-25NZ4M
0811402042 DBE6X-1X/315G24-25NZ4M
0811402078 DBEBE6X-1X/80G24K31A1M
0811402077 DBEBE6X-1X/180G24K31A1M
0811402076 DBEBE6X-1X/315G24K31A1M
0811402084 DBEBE6X-1X/80G24K31F1M
0811402079 DBEBE6X-1X/180G24K31F1M
比例溢流阀DBEM10 DBEME20 DBEME30
R901401881 DBEME 10-7X/100XYG24K31A1M
R901358181 DBEME 10-7X/100YG24K31A1M
R901363286 DBEME 10-7X/100YG24K31A1V
R901445550 DBEME 10-7X/100YG24K31F1M
R901375464 DBEME 10-7X/200XYG24K31A1M
R901353062 DBEME 10-7X/200YG24K31A1M
R901363307 DBEME 10-7X/200YG24K31A1V
R901386840 DBEME 10-7X/200YG24K31F1V
R901353063 DBEME 10-7X/315XYG24K31A1M
R901409594 DBEME 10-7X/315XYG24K31F1V
R901344448 DBEME 10-7X/315YG24K31A1M
R901363308 DBEME 10-7X/315YG24K31A1V
R901401760 DBEME 10-7X/315YG24K31F1M
R901371975 DBEME 10-7X/350XYG24K31A1M
R901358182 DBEME 10-7X/350YG24K31A1M
R901356058 DBEME 10-7X/350YG24K31A1V
R901374804 DBEME 10-7X/350YG24K31F1M
R901384767 DBEME 10-7X/50XYG24K31A1M
R901443880 DBEME 10-7X/50XYG24K31F1V
R901353061 DBEME 10-7X/50YG24K31A1M
R901363310 DBEME 10-7X/50YG24K31A1V
R901396002 DBEME 10-7X=315YG24K31A1M
R901404380 DBEME 20-7X/100XYG24K31F1M
R901353064 DBEME 20-7X/100YG24K31A1M
R901335395 DBEME 20-7X/100YG24K31A1V
R901398799 DBEME 20-7X/100YG24K31F1V
R901378240 DBEME 20-7X/200XYG24K31A1M
R901353065 DBEME 20-7X/200YG24K31A1M
R901335394 DBEME 20-7X/200YG24K31A1V
R901396821 DBEME 20-7X/200YG24K31F1M
R901443291 DBEME 20-7X/200YG24K31F1V
R901353067 DBEME 20-7X/315XYG24K31A1M
R901409593 DBEME 20-7X/315XYG24K31F1V
R901353070 DBEME 20-7X/315YG24K31A1M
R901335393 DBEME 20-7X/315YG24K31A1V
R901429620 DBEME 20-7X/315YG24K31F1M
R901394946 DBEME 20-7X/350XYG24K31A1M
