DB20-2-5X/50 REXROTH溢流閥

DB20-2-5X/50 REXROTH溢流閥 德國(guó)博世力士樂(lè)REXROTH 溢流閥 電磁溢流閥 原裝現(xiàn)貨

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DB20-2-5X/50 REXROTH溢流閥

DB 型閥是先導(dǎo)控制式的溢流閥； DBW 型閥是先導(dǎo)控制式的電磁溢閥。 DB

型閥是用來(lái)控制液壓系統(tǒng)的壓力； DBW 型閥也可以控制液壓系統(tǒng)的壓力， 并且

能在任意時(shí)刻使系統(tǒng)卸荷。

DB 型閥主要是由先導(dǎo)閥和主閥組成。 DBW 型閥是由電磁換向閥、 先導(dǎo)閥和

主閥組成。

DB 型溢流閥：

A 腔的壓力油作用在主閥芯下端的同時(shí)，

通過(guò)阻尼器 、  和通道 、  、

 作用在主閥芯上端和先導(dǎo)閥 的錐 閥

上。 當(dāng)系統(tǒng)壓力超過(guò)彈簧 的調(diào)定值時(shí)， 錐閥

 被打開(kāi)。 同時(shí)主閥芯上端的壓力油通過(guò)阻尼

器 、 通道 、 彈簧腔 及通道

流回 B 腔（控制油內(nèi)排型） 或通過(guò)外排口

流回油箱（控制油外排型） 。 這樣， 當(dāng)壓力油通過(guò)阻尼器 、  時(shí)在主閥

芯 上產(chǎn)生了一個(gè)壓力差， 主閥芯在這個(gè)壓差的作用下打開(kāi)， 這樣在調(diào)定的

工作壓力下壓力油從 A 腔流到 B 腔（即卸荷） 。

 

先導(dǎo)型溢流閥發(fā)出的機(jī)械噪聲，一般來(lái)自零件的撞擊和由于加工誤差等產(chǎn)生的零件磨擦。在先導(dǎo)型溢流閥發(fā)出的噪聲中，有時(shí)會(huì)農(nóng)業(yè)生產(chǎn)體系械性的高頻振動(dòng)聲，一般稱它為自激振動(dòng)聲。這是主閥和導(dǎo)閥因高頻振動(dòng)而發(fā)生的聲音。它的發(fā)生率與回油管道的配置、流量、壓力、油溫(粘度)等因素有關(guān)。-般情況下，管道口徑小、流量少、壓力高、油液粘度低，自激振動(dòng)發(fā)生率就高。

減小或消除先導(dǎo)型溢流閥噪聲和振動(dòng)的措施，一般是在導(dǎo)閥部分加置消振元件。

消振套一般固定在導(dǎo)閥前腔，即共振腔內(nèi)，不能自由活動(dòng)。在消振套上都設(shè)有各種阻尼孔，以增加阻尼來(lái)消除震動(dòng)。另外，由于共振腔中增加了零件，使共振腔的容積減小，油液在負(fù)壓時(shí)剛度增加，根據(jù)剛度大的元件不易發(fā)生共振的原理，就能減少發(fā)生共振的可能性。

溢流閥型號(hào)

R900589433 DB20-2-5X/100

R900929462 DB20-2-5X/100-70

R900500869 DB20-2-5X/100/12

R900911337 DB20-2-5X/100/50

R900558857 DB20-2-5X/100=LB

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R900535931 DB20-2-5X/200/12

R900558858 DB20-2-5X/200=LB

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R900465515 DB25G1-3X/315X/5

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電磁換向閥是液壓控制系統(tǒng)和電氣控制系統(tǒng)之轉(zhuǎn)換元件。它由液壓機(jī)械中的按鈕開(kāi)關(guān)、限位開(kāi)關(guān)、行程開(kāi)關(guān)、壓力繼電器等電氣元件發(fā)出信號(hào)，使電磁鐵通電吸合或斷電釋放，從而直接控制閥芯移位，來(lái)實(shí)現(xiàn)油流的溝通、切斷和方向變換，來(lái)操縱各執(zhí)行機(jī)構(gòu)的動(dòng)作。推動(dòng)故障檢查按鈕可使滑閥閥芯手推移動(dòng)。