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ZDR6D型减压阀是叠加式结构三通直动式减压阀，它对次级回路有减压功能。用于系统压力减压。其组成主要包括 1阀体 2控制阀芯 3压缩弹簧和调节元件以及可选单向阀。
DA型
在静态位置，该阀洞常开，油液可自由地价油口A1流向油口A2。油口A2压力经控制油路同时作用于弹簧对面的活塞面积上。当油口A2的压力超过弹簧设定值时，控制阀芯移至控制位置，油口A2的压力保持稳定。
信号和控制油经控制油道从洞口A2内部提供。 如果A2的压力由于外力作用于执行器而继续升高，阀芯就继续向压缩弹簧方向移动。
这样油口A2经控制活塞上的台肩与油箱连通。足够的油液流回油箱，以防止压力进一步升高。
弹簧腔经孔至洞口T（Y）由外部泄油至油箱。压力表接口用于阀的二次压力监测。
DP和DB型
在DP型中，油口P1减压。信号和控制油从油口P1内部提供。在DB型中，油口P1减压但控制油取自B。
注意！
在DB型中，当方向阀处于P至A位置时，必须确保油口B的压力不高于设定压力。否则油口的压力将降低。
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