DBW10B1-52/200-6EG24N9K4直动式溢流阀

DBW10B1-52/200-6EG24N9K4直动式溢流阀

溢流阀

类型:直动式、先导式

作用:

(1)在不断溢流过程中保持系统压力恒定，起稳压和溢流作用(p,FP

系统’阀口常开) ;

(2)防止液压系统过载，起安全保护作用(p,=1.1~1.2p,max，阀口常闭)

(一)溢流阀的基本结构及其工作原理

1、直动式溢流阀

工作原理:

直接利用液压力与弹簧力相平衡以控制阀芯的启闭动作，从而保证进油口压力基本恒定。

特点:

①阀芯所受的液压力全靠弹簧力平衡，故当系统压力很高时，弹簧必须很硬，导致结构笨重，调压不轻便。一般用于压力小于2.5MPa的低压系统中，作安全阀或背压阀使用。

②由于惯性或负载的变化，导致q、变化，即开口度h的变化，由于k很大，所以p不稳定，稳压精度差;

③结构简单、便宜，但工作时易产生振动和噪音。

 

1）电磁溢流阀原理上，一般是由先导式溢流阀加上一个2位2通电磁阀组成。

2）这个电磁阀实际上由两部分组成：2位2通的液压阀部分，加上一个电磁铁。2位2通阀是开通，还是关闭，是由电磁铁推动阀芯运动来实现的。有的阀电磁铁通电时打开，有的阀电磁铁断电时打开，萝目青菜个人各爱（根据系统要求选择）。也就是说，电磁阀这里有一条通路一头与先导溢流阀的某个部位相连，另一头通过油管与油箱相连。通过操作电磁铁可以让先导溢流阀的某个部位或者与油箱相通，或者不与油箱相通。

溢流阀型号

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电磁阀在使用时常常还希望它兼具手动功能，作为停电或故障时备用。

一般手动装置只能手动开阀或手动关阀，二者齐备的称完全手动。手动装置还能对阀门开度进行预置，一般手动只能对阀的较大或较小开度进行预置，而完全手动能分别对较大或较小开度进行预置。ZDF多功能电磁阀属完全手动类。其它型号电磁阀根据需要可带简单的一般手动装置。