Rexroth直动式比例溢流阀0811402001 DBETBX-1X/250G24-37Z4M-38

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，下面还要配一个大通径的溢流阀。

Rexroth直动式比例溢流阀DBEP6C06-1X/25AG24K4M

型号 (Z)DBE and (Z)DBEE 

比例溢流阀，先导式

规格6 

安装面按DIN 24340 A型和ISO 4401 

用于限制系统压力的阀 

比例电磁铁操作 

底板安装，DBE和DBEE型 

叠加型，ZDBE和ZDBEE型 

集成电控器（OBE），用于DBEE and ZDBEE型 

线性压力/指令值特性曲线

型号 DBE(M) 和 DBE(M)E 

比例溢流阀，先导式

规格10至32 

安装面按DIN 24340 E型 

用于限制系统压力的阀 

比例电磁铁操作 

底板安装 

DBEM 和 DBEME型的最大溢流功能 

DBEE 和 DBEME型的集成电控器（OBE） 

线性压力/指令值特性曲线（规格10和25）

型号 DBE 

比例溢流阀，先导式

规格6和10 

规格6：安装面按ISO 4401 

规格10：安装面按 ISO 5781-AG-06-2-A 

用于限制系统压力的阀 

DBEBE型的集成电控器（OBE） 

比例电磁铁操作 

通过电磁铁电枢位置进行调节 

型号 KBVS 

比例溢流阀，先导式（高性能）

规格3 

用于限制系统压力的先导阀 

比例电磁铁操作 

有中心螺纹和可拆卸线圈的比例电磁铁 

起螺丝插装阀 

在电控器上外部对指令值/压力特性曲线进行很好的平衡 

如果遇到断电，可得到最小（"A"）或最大("B")压 

型号 DBEP 

比例溢流阀，直动式

规格6 

安装面按DIN 24340 A型和ISO 4401 

系统限压阀 

比例电磁铁操作 

底板安装 

型号 DBET 和 DBETE 

比例溢流阀，直动式

规格6 

安装面按DIN 24340 A型和ISO 4401 

系统限压阀 

比例电磁铁操作 

底板安装 

用于DBETE型的集成电控器（OBE） 

线性压力/指令值特性曲线 

提供起螺丝插装阀 

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比例溢流阀的主要作用：

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：比例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：在比例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。

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）。

溢流阀一般有两种结构：1、直动型溢流阀。2、先导式溢流阀。

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。