DBW20A2-52/200-6EG24N9K4电磁溢流阀

DBW20A2-52/200-6EG24N9K4电磁溢流阀 德国博世力士乐REXROTH电磁溢流阀

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DBW20A2-52/200-6EG24N9K4电磁溢流阀

先导溢流阀的主阀上腔压力，是由先导阀加于控制的。如果先导阀正常工作，即主阀上腔有先导阀规定的压力，则整个溢流阀就会在系统压力到达调定压力时其主阀口打开一定的开度，一方面能将系统多余流量流回油箱，另一方面又能维持系统的压力为先导阀的调定值。可见，先导阀主要管压力，主阀服从先导阀的领导，在先导阀动作时将主阀口开到合适大小，正好将多余流量流出去，又不影响系统压力。

 

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较限（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%）。

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）。

 

液压控制阀,

一、液压控制阀的分类

1.概述

在液压系统中,用于控制和调节工作压力的高低、流量大小以及改变流量方向的元件统称为液压控制阀。液压控制阀通过对工作液体的压力、流量以及流液方向的控制与调节,从而可以控制液压执行元件的开启、停止和换向,调节其运动速度和输出扭矩(或力)

2.液压控制阀的分类 .

2.1按功能分类

(1)压力控制阀用于控制或调节液压系统或回路压力的阀， 如溢流阀、减压阀、顺序阀压力继电器等;

(2)方向控制阀用于控制或调节液压系统或回路中方向及其通和断,从而控制执行元件的运动方向及其启动、停止的阀。如单向阀、换向阀等;

(3)流量控制阀用于控制或调节液压系统或回路中工作液体流量大小的阀。如节流阀、调速阀、分集流阀等

2.2按阀的控制方式分类

液压控制阀按控制方式可分为:

(1)开关(或定值)控制阀:借助于通断型电磁铁及手动、机动、液动等方式,将阀芯位置或阀芯上的弹簧设定在某一工作状态 ,使液流的压力、流量或流向保持不变的阀。这类阀属于常见的普通液压阀

(2)比例控制阀:采用比例电磁铁(或力矩马达)将输入信号转换成力或阀的机械位移,使阀的输出(压力、流量)也按照其输入量连续、成比例地进行控制的阀,比例控制阀一般属于开环控制阀, 现在也很多用在闭环系统中。

(3)伺服控制阀:其输入信号(电量、机械量)多为偏差信号(输入信号与反馈信号的差值),阀的输出量( 压力、流量)也按照其输入量连续、成比例地进行控制的阀。这类阀的工作性能类似于比例控制阀,但具有较高的动态瞬应和静态性能,多用于要求较高的、响应快的闭环液压控制系统。

(4)数字控制阀:用于数字信息直接控制的阀类。

 

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。

溢流阀型号

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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，甚至影响正常工作。

电磁溢流阀常见的故障有先导电磁阀工作失灵、主阀调压失灵和卸荷时的冲击噪声等。后者可通过调节加置的缓冲器来减少或消除。如不带缓冲器，则可在主阀溢流口加一背压阀。(压力一 般调至5kgf/cm2左右，即0.5MPa)。