DB20-2-50/50力士樂(lè)溢流閥

DB20-2-50/50力士樂(lè)溢流閥 德國(guó)博世力士樂(lè)REXROTH直動(dòng)式溢流閥先導(dǎo)式溢流閥

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DB20-2-50/50力士樂(lè)溢流閥

溢流閥一般有兩種結(jié)構(gòu)：1、直動(dòng)型溢流閥 。2、先導(dǎo)式溢流閥。

對(duì)溢流閥的主要要求：調(diào)壓范圍大，調(diào)壓偏差小，壓力振擺小，動(dòng)作靈敏，過(guò)載能力大，噪聲小。

先導(dǎo)型溢流閥的導(dǎo)閥部分結(jié)構(gòu)尺寸較小，調(diào)壓彈簧不必很強(qiáng)，因此壓力調(diào)整比較輕便。但因先導(dǎo)型溢流閥要在先導(dǎo)閥和主閥都動(dòng)作后才能起控制作用，因此反應(yīng)不如直動(dòng)型溢流閥靈敏。

與三節(jié)同心結(jié)構(gòu)相比，二節(jié)同心結(jié)構(gòu)的特點(diǎn)是：①主閥芯僅與閥套和主閥座有同心度要求，免去了與閥蓋的配合，故結(jié)構(gòu)簡(jiǎn)單，加工和裝配方便。②過(guò)流面積大，在相同流量的情況下，主閥開(kāi)啟高度小；或者在相同開(kāi)啟高度的情況下，其通流能力大，因此，可做得體積小、重量輕。③主閥芯與閥套可以通用化，便于籌備批量生產(chǎn)。

液壓閥是用來(lái)控制液壓系統(tǒng)中油液的壓力、流量和液體流動(dòng)方向。

二、液壓閥的分類(lèi)

按功能分:

方向控制閥(單向閥、換向閥)

壓力控制閥(溢流閥、減壓閥、順序閥、壓力繼電器)

流量控制閥(節(jié)流閥、調(diào)速閥)

按操縱方式分:

手動(dòng)和腳踏、機(jī)動(dòng)、電動(dòng)、液動(dòng)、電液動(dòng)等。

共同點(diǎn)

(1) 在結(jié)構(gòu)上，所有的閥都有閥體、閥芯(轉(zhuǎn)閥或滑閥)和驅(qū)使閥芯動(dòng)作的部件(如彈簧、電磁鐵)組成。

(2)在工作原理上，所有閥的開(kāi)口大小，閥進(jìn)、出口壓差以及流過(guò)閥的流量之間的關(guān)系都符合孔口流量公式，僅是各種閥控制的參數(shù)各不相同而已。

三、對(duì)液壓閥的基本要求

(1)動(dòng)作靈敏，使用可靠，工作時(shí)沖擊和振動(dòng)小。

(2)油液流過(guò)的壓力損失小。

(3)密封性能好。

(4)結(jié)構(gòu)緊湊，安裝、調(diào)整、使用、維護(hù)方便，通用性大。

DB20-2-50/50力士樂(lè)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） 。

溢流閥型號(hào)

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R900558858 DB20-2-5X/200=LB

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二通插裝閥以其獨(dú)特的優(yōu)點(diǎn)以及經(jīng)濟(jì)和技術(shù)上的明顯優(yōu)勢(shì)被廣泛應(yīng)用到各個(gè)行業(yè)。在集成的液壓元件中，當(dāng)通徑小于32mm時(shí)，可采用疊加

閥，當(dāng)通徑大于中32mm時(shí)，應(yīng)考慮采用插裝閥。在一個(gè)液壓系統(tǒng)中,可根據(jù)需要，液壓控制閥全部采用二通插裝閥;也可以部分液壓控制閥采用滑閥式，另一部分液壓控制閥采用二通插裝閥，充分發(fā)揮兩種液壓控制閥各自的優(yōu)點(diǎn)。

壓力機(jī)械屬于重型機(jī)械，主要應(yīng)用于冶金行業(yè).重型機(jī)械制造、化工等行業(yè)，如沖壓機(jī)、鍛造機(jī)、剪切機(jī)、粉末制品壓力機(jī)、擠壓機(jī)等。壓力機(jī)械的動(dòng)力及控制部分多數(shù)采用液壓傳動(dòng),由于液壓系統(tǒng)所需的壓力高、流量大，故適于用二通插裝閥來(lái)控制液壓系統(tǒng)的壓力、流量和流動(dòng)方向。