DBW20A2-52/200-6EG24N9K4電磁溢流閥

DBW20A2-52/200-6EG24N9K4電磁溢流閥 德國博世力士樂REXROTH電磁溢流閥

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DBW20A2-52/200-6EG24N9K4電磁溢流閥

先導(dǎo)溢流閥的主閥上腔壓力，是由先導(dǎo)閥加于控制的。如果先導(dǎo)閥正常工作，即主閥上腔有先導(dǎo)閥規(guī)定的壓力，則整個溢流閥就會在系統(tǒng)壓力到達(dá)調(diào)定壓力時其主閥口打開一定的開度，一方面能將系統(tǒng)多余流量流回油箱，另一方面又能維持系統(tǒng)的壓力為先導(dǎo)閥的調(diào)定值。可見，先導(dǎo)閥主要管壓力，主閥服從先導(dǎo)閥的領(lǐng)導(dǎo)，在先導(dǎo)閥動作時將主閥口開到合適大小，正好將多余流量流出去，又不影響系統(tǒng)壓力。

 

穩(wěn)壓作用：溢流閥串聯(lián)在回油路上，溢流閥產(chǎn)生背壓，運動部件平穩(wěn)性增加。

系統(tǒng)卸荷作用：在溢流閥的遙控口串接溢小流量的電磁閥，當(dāng)電磁鐵通電時，溢流閥的遙控口通油箱，此時液壓泵卸荷。溢流閥此時作為卸荷閥使用。

安全保護(hù)作用：系統(tǒng)正常工作時，閥門關(guān)閉。只有負(fù)載超過規(guī)定的較限（系統(tǒng)壓力超過調(diào)定壓力）時開啟溢流，進(jìn)行過載保護(hù)，使系統(tǒng)壓力不再增加（通常使溢流閥的調(diào)定壓力比系統(tǒng)高工作壓力高10%～20%）。

實際應(yīng)用中一般有：作卸荷閥用，作遠(yuǎn)程調(diào)壓閥，作高低壓多級控制閥，作順序閥，用于產(chǎn)生背壓（串在回油路上）。

 

液壓控制閥,

一、液壓控制閥的分類

1.概述

在液壓系統(tǒng)中,用于控制和調(diào)節(jié)工作壓力的高低、流量大小以及改變流量方向的元件統(tǒng)稱為液壓控制閥。液壓控制閥通過對工作液體的壓力、流量以及流液方向的控制與調(diào)節(jié),從而可以控制液壓執(zhí)行元件的開啟、停止和換向,調(diào)節(jié)其運動速度和輸出扭矩(或力)

2.液壓控制閥的分類 .

2.1按功能分類

(1)壓力控制閥用于控制或調(diào)節(jié)液壓系統(tǒng)或回路壓力的閥， 如溢流閥、減壓閥、順序閥壓力繼電器等;

(2)方向控制閥用于控制或調(diào)節(jié)液壓系統(tǒng)或回路中方向及其通和斷,從而控制執(zhí)行元件的運動方向及其啟動、停止的閥。如單向閥、換向閥等;

(3)流量控制閥用于控制或調(diào)節(jié)液壓系統(tǒng)或回路中工作液體流量大小的閥。如節(jié)流閥、調(diào)速閥、分集流閥等

2.2按閥的控制方式分類

液壓控制閥按控制方式可分為:

(1)開關(guān)(或定值)控制閥:借助于通斷型電磁鐵及手動、機動、液動等方式,將閥芯位置或閥芯上的彈簧設(shè)定在某一工作狀態(tài) ,使液流的壓力、流量或流向保持不變的閥。這類閥屬于常見的普通液壓閥

(2)比例控制閥:采用比例電磁鐵(或力矩馬達(dá))將輸入信號轉(zhuǎn)換成力或閥的機械位移,使閥的輸出(壓力、流量)也按照其輸入量連續(xù)、成比例地進(jìn)行控制的閥,比例控制閥一般屬于開環(huán)控制閥, 現(xiàn)在也很多用在閉環(huán)系統(tǒng)中。

(3)伺服控制閥:其輸入信號(電量、機械量)多為偏差信號(輸入信號與反饋信號的差值),閥的輸出量( 壓力、流量)也按照其輸入量連續(xù)、成比例地進(jìn)行控制的閥。這類閥的工作性能類似于比例控制閥,但具有較高的動態(tài)瞬應(yīng)和靜態(tài)性能,多用于要求較高的、響應(yīng)快的閉環(huán)液壓控制系統(tǒng)。

(4)數(shù)字控制閥:用于數(shù)字信息直接控制的閥類。

 

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，

通過阻尼器 、  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)壓力超過彈簧 的調(diào)定值時， 錐閥

 被打開。 同時主閥芯上端的壓力油通過阻尼

器 、 通道 、 彈簧腔 及通道

流回 B 腔（控制油內(nèi)排型） 或通過外排口

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

芯 上產(chǎn)生了一個壓力差， 主閥芯在這個壓差的作用下打開， 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） 。

DBW 型電磁溢流閥：

此閥工作原理與 DB 型閥相同， 只是可通過安裝在先導(dǎo)閥上的電磁換向閥 使系統(tǒng)在任意時刻卸荷。

DB/DBW 型閥均設(shè)有控制油內(nèi)部供油道 、  和內(nèi)部排油道 ；

控制油外供口 X 和外排口 Y。這樣就可根據(jù)控制油供給和排出的不同形式的組合

內(nèi)供內(nèi)排、 外供內(nèi)排、 內(nèi)供外排和外供外排 4 種型式。

溢流閥型號

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溢流閥在裝配或使用中，由于“O”形密封圈、組合密封圈的損壞，或者安裝螺釘、管接頭的松動，都可能造成不應(yīng)有的外泄漏。

如果錐閥或主閥芯磨損過大，或者密封面接觸不良，還將造成內(nèi)泄漏過大，甚至影響正常工作。

電磁溢流閥常見的故障有先導(dǎo)電磁閥工作失靈、主閥調(diào)壓失靈和卸荷時的沖擊噪聲等。后者可通過調(diào)節(jié)加置的緩沖器來減少或消除。如不帶緩沖器，則可在主閥溢流口加一背壓閥。(壓力一 般調(diào)至5kgf/cm2左右，即0.5MPa)。