DBD型溢流阀是直接作用式溢流阀，有锥阀结构（压力到40MPA)和球阀结构（压力到63MPA)共7种压力级：2.5、5、10、20、31.5、40、63MPA。三种压力调节方式：调节手柄、带锁的调节手柄、带保护罩的调节螺栓。三种连接方式：板式、管式、插入式。该阀体积小，结构紧凑，流量物性好，噪声小，压力稳定，广泛用在小流量系统中，作为安全阀、遥控阀。插入式结构：该阀由插入体弹簧调节机构具减震活塞的锥阀（球阀）及弹簧座组成。锥阀靠弹簧力固定在弹簧座上，通过调节机构调整弹簧来无级调整压力。压力油从P口进阀体，作用在锥阀和减震活塞上，当达到调定压力时，压力油克服弹簧力将锥阀抬起，压力油流向T口。锥阀的行程靠销钉限制。

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，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。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。

力士乐溢流阀热销型号：

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