DBW10B1-52/200-6EG24N9K4直動(dòng)式溢流閥

DBW10B1-52/200-6EG24N9K4直動(dòng)式溢流閥

溢流閥

類型:直動(dòng)式、先導(dǎo)式

作用:

(1)在不斷溢流過(guò)程中保持系統(tǒng)壓力恒定，起穩(wěn)壓和溢流作用(p,FP

系統(tǒng)’閥口常開(kāi)) ;

(2)防止液壓系統(tǒng)過(guò)載，起安全保護(hù)作用(p,=1.1~1.2p,max，閥口常閉)

(一)溢流閥的基本結(jié)構(gòu)及其工作原理

1、直動(dòng)式溢流閥

工作原理:

直接利用液壓力與彈簧力相平衡以控制閥芯的啟閉動(dòng)作，從而保證進(jìn)油口壓力基本恒定。

特點(diǎn):

①閥芯所受的液壓力全靠彈簧力平衡，故當(dāng)系統(tǒng)壓力很高時(shí)，彈簧必須很硬，導(dǎo)致結(jié)構(gòu)笨重，調(diào)壓不輕便。一般用于壓力小于2.5MPa的低壓系統(tǒng)中，作安全閥或背壓閥使用。

②由于慣性或負(fù)載的變化，導(dǎo)致q、變化，即開(kāi)口度h的變化，由于k很大，所以p不穩(wěn)定，穩(wěn)壓精度差;

③結(jié)構(gòu)簡(jiǎn)單、便宜，但工作時(shí)易產(chǎn)生振動(dòng)和噪音。

 

1）電磁溢流閥原理上，一般是由先導(dǎo)式溢流閥加上一個(gè)2位2通電磁閥組成。

2）這個(gè)電磁閥實(shí)際上由兩部分組成：2位2通的液壓閥部分，加上一個(gè)電磁鐵。2位2通閥是開(kāi)通，還是關(guān)閉，是由電磁鐵推動(dòng)閥芯運(yùn)動(dòng)來(lái)實(shí)現(xiàn)的。有的閥電磁鐵通電時(shí)打開(kāi)，有的閥電磁鐵斷電時(shí)打開(kāi)，蘿目青菜個(gè)人各愛(ài)（根據(jù)系統(tǒng)要求選擇）。也就是說(shuō)，電磁閥這里有一條通路一頭與先導(dǎo)溢流閥的某個(gè)部位相連，另一頭通過(guò)油管與油箱相連。通過(guò)操作電磁鐵可以讓先導(dǎo)溢流閥的某個(gè)部位或者與油箱相通，或者不與油箱相通。

溢流閥型號(hào)

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電磁閥在使用時(shí)常常還希望它兼具手動(dòng)功能，作為停電或故障時(shí)備用。

一般手動(dòng)裝置只能手動(dòng)開(kāi)閥或手動(dòng)關(guān)閥，二者齊備的稱完全手動(dòng)。手動(dòng)裝置還能對(duì)閥門(mén)開(kāi)度進(jìn)行預(yù)置，一般手動(dòng)只能對(duì)閥的較大或較小開(kāi)度進(jìn)行預(yù)置，而完全手動(dòng)能分別對(duì)較大或較小開(kāi)度進(jìn)行預(yù)置。ZDF多功能電磁閥屬完全手動(dòng)類。其它型號(hào)電磁閥根據(jù)需要可帶簡(jiǎn)單的一般手動(dòng)裝置。