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溢流阀是一种液压压力控制阀，在液压设备(http://www.maoyihang.com/sell/l_4/)中主要起定压溢流，稳压，系统卸荷和安全保护作用。溢流阀在装配或使用中，由于O形密封圈、组合密封圈的损坏，或者安装螺钉、管接头的松动，都可能造成不应有的外泄漏。如果锥阀或主阀芯磨损过大，或者密封面接触不良，还将造成内泄漏过大，甚*影响正常工作。
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(http://www.maoyihang.com/sell/l_35/)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*高工作压力高10%～20%）。
DB10-1-52/350先导式溢流阀
DB10-1-52/350先导式溢流阀
DB 型阀是先导控制式的溢流阀； DBW 型阀是先导控制式的电磁溢阀。 DB
型阀是用来控制液压系统的压力； DBW 型阀也可以控制液压系统的压力， 并且
能在任意时刻使系统卸荷。
DB 型阀主要是由先导阀和主阀组成。 DBW 型阀是由电磁换向阀、 先导阀和
主阀组成。
型号 ZDB 和 Z2DB
叠加式溢流阀，先导式
规格6和10
安装面按DIN 24340 A 型和ISO 4401
4个压力等级：50，100，200，315
5个溢流功能：
4个可选的调整方式
旋钮
带护罩的六角套筒螺钉
带锁有刻度旋钮
有刻度旋钮
型号 ZDBK 和 Z2DBK
叠加式溢流阀，先导式（210bar系列）
规格6和10
安装面按DIN 24340 A型和ISO 4401
5种溢流功能
A – T, P – T, B – T, A – T 和 B – T, A – B 和 B – A
3个压力等级：50，100，210bar
型号ZDB和Z2DB
叠加式溢流阀，先导式
规格6和10
安装面按DIN24340A型和ISO4401
4个压力等级：50，100，200，315
5个溢流功能：
4个可选的调整方式
旋钮
带护罩的六角套筒螺钉
带锁有刻度旋钮
有刻度旋钮
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