DBW20A2-52/315-6EG24N9K4 REXROTH溢流阀

DBW20A2-52/315-6EG24N9K4 REXROTH溢流阀

性能

(1)调压范围：它是指减压阀输出压力P2的可调范围，在此范围内要求达到规定的精度。调压范围主要与调压弹簧的刚度有关。

(2)压力特性：它是指流量g为定值时，因输入压力波动而引起输出压力波动的特性。输出压力波动越小，减压阀的特性越好。输出压力必须低于输入压力—定值才基本上不随输入压力变化而变化。

(3)流量特性：它是指输入压力—定时，输出压力随输出流量g的变化而变化的持性。当流量g发生变化时，输出压力的变化越小越好。一般输出压力越低，它随输出流量的变化波动就越小

压力控制阀

压力控制阀(简称压力阀)是用来控制液压传动系统或气压传动系统中流体压力的一种控制阀。

常用的压力阀有:溢流阀、减压阀、顺序阀和压力继电器等。

大型钢厂现场采用的压力控制阀种类很多, 如:减压溢流阀、比例减压阀、先导式溢流阀、直动式溢流阀、溢流阀、电磁溢流阀、板式减压阀、减压阀、比例减压溢流阀、压力补偿器。

针对具有代表性的,现场易出故障的压力控制阀的工作原理和结构进行分析。

1、DR型先导式减压阀

1.结构分析

其组成主要包括带主阀插件(3)的主阀(1)和带压力调节组件的先导阀(2)。在静态位置,阀常开，油液可自由地从油口B经主阀芯插件(3)进入油口A。油口A的压力作用于主阀芯的底侧。同时作用于先导阀(2)中的球阀(6)上, 经节流孔(4)作用于主阀芯(3)的弹簧加载侧,并且流经油口(5)。

同样,压力经节流孔(7)、控制油路(8)、单向阀(9)和节流孔(10)作用于球阀(6)上。根据弹簧(11)的设定,在球阀(6)前部、油口(5)中和弹簧腔(12)内建压,保持控制活塞(13)处于开启位置。

油液可自由地从油口B经主阀芯插件(3)流入油口A，直至油口A的压力超过弹簧(11)的设定值,并打开球阀(6)、控制活塞(13)移至关闭位置。

当油口A的压力与弹簧设定压力之间达到平衡时, 获得期望的减压压力。控制油经控制油路(15)由外部从弹簧腔(14)泄回油箱。通过安装一个可选的单向阀 (16)可实现从油口A至B的自由返回流动。压力表接口(17)用于油口A的减压压力监测。

先导式卸荷式溢流阀，电磁卸荷溢流阀用于带蓄能器的液压系统，使泵自动卸荷或加载;用于高低压双泵系统，使低压泵卸荷。DAW型阀利用电磁阀使系统卸荷。

先导式溢流阀主要由先导阀、带主阀芯的主阀和单向阀组成，电磁溢流阀还在先导阀上装有电磁阀。通径10mm的先导式卸荷阀的单向阀在主体阀内;而通径25mm和32mm的先导式卸荷阀的单向阀在主阀底下的连接板内。溢流阀应用于有蓄能器的液压系统中时，主要作用是给蓄能器补油:应用于高、低压双泵系统中时，可使低压泵卸荷。而DAW型阀利用其上的电磁阀，还可以在任何压力下使系统卸荷。

溢流阀型号

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液压元件系统由五个部分组成，即动力元件、执行元件、控制元件、辅助元件和液压油。动力

元件的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。执行元件(如液压缸和液压马达)的作用是将液体的压力能转换为机械能，驱动负载作直线往复运动或回转运动。 控制元件(即各种液压阀)在液压系统中控制和调节液体的压力、流量和方向。根据控制功能的不同，液压阀可分为压力控制阀、流量控制阀和方向控制阀。压力控制阀又分为溢流阀(安全阀)、减压阀、顺序阀、压力继电器等；流量控制阀包括节流阀、调整阀、分流集流阀等；方向控制阀包括单向阀、液控单向阀、梭阀、换向阀等。根据控制方式不同，液压阀可分为开关式控制阀、定值控制阀和比例控制阀。 辅助元件包括油箱、滤油器、油管及管接头、密封圈、压力表、油位油温计等。