Rexroth溢流阀DBW20B1-5X/200-6EG24N9K4

Rexroth溢流阀DBW20B1-5X/200-6EG24N9K4 德国力士乐先导式电磁溢流阀库存现货供应 欢迎来电咨询

先导式溢流阀
DB ; DBW型
通径10至32
5X系列
较好工作压力350 bar
较好流量650 L/min

DB和DBW型压力控制阀是先导式溢流阀。它们用于限制(DB型)，或用电磁铁限制及卸荷系统压力(DBW型)。该溢流阀(DB型)的组成主要包括带主阀芯插件(3)的主阀(1)和带压力调节元件的先导阀(2)。DB型溢流阀油路A中的压力作用于主阀芯(3).上。同时，压力经带节流孔(4)和(5)的控制通路(6)和(7)，作用在主阀芯(3)的弹簧加载侧及先导阀(2)的球(8)上。如果A口的压力超过弹簧(9)的设定值，球(8)克服弹簧力(9)而使先导阀开启。

该信号经控制通道(10)和(6)从A口内部获取。主阀芯(3)弹簧加载侧的油液经过控制通路(7)、节流孔(11)和球阀(8)流入弹簧腔(12)。 对DB..5x.型它由控制通路(13)内部引入油箱， 而对DB..-5X.. Y-型经控制通路(14)它由外部引入油箱。节流孔(4)和(5)在主阀芯(3)两端产生压降，因此A到B连接通道被打开。油液由A口流向B口，而设定工作压力保持不变。溢流阀借助油口X(15)可对不同压力(二级压力)卸荷或切换。

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。具体作用如下:
1、起溢流作用。用定量泵供油时，它与节流阀配合，可以调节和平衡液压系统中的流量。在这种场合下，阀门经常随着压力的波动
而开启，油液经阀门流回油箱，起着定压下的溢流作用。
2、起安全保护作用。避免液压系统和机床因过载而引起事故。在这种场合下，阀门平时是关闭的，只有负载超过规定的极限时才开
启，起安全保护作用。通常，把溢流阀的调定压力比系统较高工作压力调高10~20%　
3、作卸荷阀用。由先导溢流阀与二位二通电磁阀配合使用，可使系统卸荷。
4、作远控调压的阀用。用管道将溢流阀的遥控口接到调节方便的远程调节阀进口处，以实现远控目的
5、作高低压多级控制。用换向阀将溢流阀的遥控口和几个远程调压连接，即可实现高低多级控制。
6、作顺序阀用。把先导式溢流阀回油口改为输出压力油的出口，并将压力顶开锥形阀后原回油的通道堵列，使它经过重新加工的泄
油口流回油箱，这样就可做顺序阀用。
7、用于产生背压。将溢流阀串联在回油路上，可以产生背压，使执行元件运动平衡。些时溢流阀的调定压力低，-般用直动式低压
溢流阀即可。

Rexroth溢流阀DBW20B1-5X/200-6EG24N9K4　

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Rexroth溢流阀DBW20B1-5X/200-6EG24N9K4　

溢流阀和减压阀的区别
(一)可以说溢流阀是被动工作，而减压阀是主动工作
1、减压阀保持出口处压力不变，而溢流阀保持进口处压力不变;
2、在不工作时，减压阀进出口互通，而溢流阀进出口不通;
3、非工作状态时，减压阀的阀口是敞开的，而溢流阀是常闭的溢流阀是压力控制阀，主要是控制系统压力，还起卸荷的作用。
(二)减压阀是-种使阀出口压力低于进口压力的压力调节阀
1、减压阀主要是用来降低液压系统某一分支油路的压力，使分支压力比主油路压力低且稳定，在调定压力的范围内，减压阀也像溢流阀那样是关闭的。但是随着系统压力的升高当达到减压阀调定的压力时，减压阀打开，部分油液会经过他返回油箱(此时有一-定压力的油回油箱，油箱的油温会上升)，这一支路的油压是不会上升了。
它起到对本支路的减压与稳压作用!溢流阀则不同，它装在泵的出口处会保证系统的整体压力稳定且不会超压。所以他有安全、调压、稳压等作用!
2、溢流阀一般并联在系统的支路中起调压、稳压与减压作用，而减压阀一般串联在某一支路上起减压与保压本支路的作用!
(三)溢流阀是常闭的，只是当系统超压才动作;减压阀是常通的，通过狭窄通道减压溢流阀的作用是:稳压、溢流、过载保护。减压阀是减小压力，液压系统某一部分压里减小。 用途不一样。所以不能代替。

(四)溢流阀控制进油口压力，减压阀