力士樂換向閥4WRA10W1-60-22/G24K/V持續(xù)到貨中
換向閥的作用是利用閥芯和閥體的相對運(yùn)動來接通、關(guān)閉油路或變換油液通向執(zhí)行元件的流動方向,以使執(zhí)行元件啟動、停止或變換運(yùn)動方向。
對換向閥的主要性能要求如下:
①油液流經(jīng)換向閥時(shí)的壓力損失??;
②各關(guān)閉閥口的泄漏量??;
③換向可靠,換向時(shí)平穩(wěn)、迅速。
一般以下述方法分類。
(1)按接口數(shù)及切換位置數(shù)分類
所謂接口,是指閥上各種接油管的進(jìn)、出口。進(jìn)油口通常標(biāo)為P,回油口標(biāo)為T,出油口則以A、B來表示。閥內(nèi)閥芯可移動的位置數(shù)稱為切換位置數(shù),通常將接口稱為“通”,將閥芯的位置稱為“位”。
①二通閥有兩個(gè)口,即一個(gè)輸入口P和一個(gè)輸出口A。
②三通閥有3個(gè)口,除P口、A口外,還增加了一個(gè)輸出口B口。三通閥既可以是兩個(gè)輸人口(用P1、P2表示)和一個(gè)輸出口,作為選擇閥(選擇兩個(gè)不同大小的壓力值);也可以是一個(gè)輸人口和兩個(gè)輸出口,作為分配閥。4WE6D-7X/HG24N9K4 電磁換向閥
⑤五通閥有5個(gè)口,除P、A、B外,還有兩個(gè)回油口T1、T2。通路為P -A、B-T2;或P-B、A-T1。五通閥也可以變成選擇式四通閥,即兩個(gè)輸入口(P,和P)、兩個(gè)輸出口(A和B)和一個(gè)回油口T。兩個(gè)數(shù)人口供給壓力不同的壓力油。
換向閥的“位”是閥芯在閥體內(nèi)停留的工作位置個(gè)數(shù)。也就是說這個(gè)閥有幾種工作狀態(tài)。例如二位閥或三位閥是指有兩個(gè)或三個(gè)不同的工作位置。 換向閥的“通”是是指換向閥本體上的有各不相同且與系統(tǒng)中不同油管相連接的接口個(gè)數(shù)。不同油道之間只能通過閥芯移位時(shí)閥口的開關(guān)來溝通。
(2)按操作方式分類
推動閥內(nèi)閥芯移動的方法有手動、腳動、機(jī)械動、液壓動、電磁動等,如圖所示。閥上如裝有彈簧,則當(dāng)外加壓力消失時(shí),閥芯會回到原位。
力士樂換向閥4WRA10W1-60-22/G24K/V持續(xù)到貨中
4WE6D-7X/HG24N9K4 電磁換向閥
4WE6D-7X/HG24N9K4 電磁換向閥
4WE6H-6X/EG24N9K4+Z5L 電磁換向閥
4WE6H73A-6X/EG24N9K4/A13 電磁換向閥
4WE6H73A-6X/EG24N9K4/A13 電磁換向閥
4WE6H73A-6X/EG24N9K4/A13 電磁換向閥
4WE6J-62/EG24N9K4 電磁換向閥
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4WEH10J-4X/6EG24N9ETK4 電磁換向閥
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4WMM10D-11/F 手動換向閥
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4WRAE6W30-22/G24N9K31/A1 比例換向閥
4WRE6E1-32-11/24Z4/M 比例換向閥
3DREP6C-2X/25EG24N9K4/M 比例閥導(dǎo)閥
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4WE10D-3X/CG24N9K4+Z5L 電磁換向閥
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液動換向閥是利用控制油路的壓力油來改變閥芯位置的換向閥,圖5-14為三位四通液動換向閥的結(jié)構(gòu)和圖形符號。閥芯是由
其兩端密封腔中油液的壓差來移動的,當(dāng)控制油路的壓力油從閥右邊的控制油口K2進(jìn)入滑閥右腔時(shí),K1接通回油,閥芯向左移動,使壓力油口P與B相通,A與T相通;當(dāng)K1接通壓力油,K2接通回油時(shí),閥芯向右移動,使得P與A相通,B與T相通;當(dāng)K1、K2都通回油時(shí),閥芯在兩端彈簧和定位套作用下回到中間位置。液動換向閥控制油路上常裝有可調(diào)節(jié)流閥,用來調(diào)節(jié)換向時(shí)間。
由于壓力油可產(chǎn)生很大的推力,所以液動換向閥適用于高壓。簡述電液換向閥的結(jié)構(gòu)組成、工作原理和應(yīng)用場合。電液換向閥是由電磁換向閥和液動換向閥二者組合而成的。
在大中型液壓設(shè)備中,當(dāng)通過閥的流量較大時(shí),作用在滑閥上的摩擦力和液動力較大,此時(shí)電磁換向閥的電磁鐵推力相對地太小,需要用電液換向閥來代替電磁換向閥。電液換向閥中的電磁滑閥起先導(dǎo)作用,它可以改變控制液流的方向,從而改變液動滑閥閥芯的位置。由于操縱液動滑閥的液壓推力可以很大,所以液動閥主閥芯的尺寸可以做得很大,允許有較大的油液流量通過。這樣用較小的電磁鐵就能控制較大的液流。
圖5-15所示為彈簧對中型三位四通電液換向閥的結(jié)構(gòu)和圖形符號,當(dāng)先導(dǎo)電磁閥左邊的電磁鐵通電后使其閥芯向右邊位置移動,來自主閥P口的控制壓力油可經(jīng)先導(dǎo)電磁閥的左位和左單向閥進(jìn)入主閥左端容腔,并推動主閥閥芯向右移動,這時(shí)主閥閥芯右端容腔中的控制油液可通過右邊的節(jié)流閥經(jīng)先導(dǎo)電磁閥,再從主閥的T口流回油箱(主閥閥芯的移動速度可由右邊的節(jié)流閥調(diào)節(jié)),使主
閥P與A、B和T的油路相通;反之,由先導(dǎo)電磁閥右邊的電磁鐵通電,可使P與B、A與T的油路相通;當(dāng)先導(dǎo)電磁閥的兩個(gè)電磁鐵均不帶電時(shí),先導(dǎo)電磁閥閥芯在其對中彈簧作用下回到中位。
電液閥根據(jù)控制油液進(jìn)入和排出的方式不同,可以組成內(nèi)控外排、外控內(nèi)排、外控外排和內(nèi)控內(nèi)排四種控制形式,供不同的使用場合選用。