DBW30B2-5X/200-6EG24N9K4液压溢流阀

DBW30B2-5X/200-6EG24N9K4液压溢流阀 德国博世力士乐REXROTH电磁溢流阀

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。

DB 型溢流阀：

A 腔的压力油作用在主阀芯下端的同时，

通过阻尼器 、  和通道 、  、

 作用在主阀芯上端和先导阀 的锥 阀

上。 当系统压力超过弹簧 的调定值时， 锥阀

 被打开。 同时主阀芯上端的压力油通过阻尼

器 、 通道 、 弹簧腔 及通道

流回 B 腔（控制油内排型） 或通过外排口

流回油箱（控制油外排型） 。 这样， 当压力油通过阻尼器 、  时在主阀

芯 上产生了一个压力差， 主阀芯在这个压差的作用下打开， 这样在调定的

工作压力下压力油从 A 腔流到 B 腔（即卸荷） 。

DBW 型电磁溢流阀：

此阀工作原理与 DB 型阀相同， 只是可通过安装在先导阀上的电磁换向阀 使系统在任意时刻卸荷。

DB/DBW 型阀均设有控制油内部供油道 、  和内部排油道 ；

控制油外供口 X 和外排口 Y。这样就可根据控制油供给和排出的不同形式的组合

内供内排、 外供内排、 内供外排和外供外排 4 种型式。

液压传动系统的组成

1、液压动力原件

将动力装置的机械能转换成为液压能的装置，其作用是为液压传动系统提供压力油,是液压传动系统的动力源。例如液压泵。

1.1液压泵

液压泵是液压系统的动力元件，其作用是将原动机的机械能转换成液体的压力能,指液压系统中的油泵，它向整个液压系统提供动力。液压泵的结构形式一般有齿轮泵、叶片泵和柱塞泵。

1.2齿轮泵

齿轮泵即依靠密封在个壳体中的两个或两个以上齿轮,在相互啮合过程中所产生的工作空间容积变化来输送液体的泵。齿轮泵的概念是很简单的，即它的基本形式就是两个尺寸相同的齿轮在一个紧密配合的壳体内相互啮合旋转，这个壳体的内部类似“8”字形，两个齿轮装在里面,齿轮的外径及两侧与壳体紧密配合。来自于挤出机的物料在吸入口进入两个齿轮中间，并充满这一空间，随着齿的旋转沿壳体运动，后在两齿啮合时排出。

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减压阀可将阀前管路较高的液体压力减少至阀后管路所需的水平。这里的传输介质主要是水。减压阀广泛用于高层建筑、城市给水管网水压过高的区域、矿井及其他场合，以保证给水系统中各用水点获得适当的服务水压和流量。鉴于水的漏失率和浪费程度几乎同给水系统的水压大小成正比，因此减压阀具有改善系统运行工况和潜在节水作用，据统计其节水效果约为30%。