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二位四通電磁換向閥工業(yè)元件圖片(堵住其中二口B和T口，即為二位二通閥)。二位二通電磁換向閥在液壓系統(tǒng)中的典型應用是與溢流閥并聯(lián)組成卸荷回路。是利用二位二通電磁換向閥的卸荷回路。1為液壓泵，2為溢流閥，3為二位二通電磁換向閥，4三位四通雙電控“O”型中位電磁換向閥，5為液壓缸。當二位二通電磁換向閥3通電時，泵排出的液壓油以接近零壓狀態(tài)流回油箱以節(jié)省動力并避免油溫上升。注意該回路不適宜大流量的液壓系統(tǒng)。
電磁換向閥在液壓系統(tǒng)中的作用是用來實現(xiàn)液壓油路的換向、順序動作及卸荷等。由于電磁鐵的推力有限，電磁換向閥應用在流量不大的液壓系統(tǒng)中。
(1)結(jié)構原理
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。它由液壓機械中的按鈕開關、限位開關、行程開關、壓力繼電器等電氣元件發(fā)出信號，使電磁鐵通電吸合或斷電釋放，從而直接控制閥芯移位，來實現(xiàn)油流的溝通、切斷和方向變換，來操縱各執(zhí)行機構的動作。推動故障檢查按鈕可使滑閥閥芯手推移動。
電磁閥產(chǎn)品是自控系統(tǒng)中不可缺少的執(zhí)行器元件。由于電磁閥體積小，開關速度快，接線簡單，功耗低，性價比高，經(jīng)濟實用等顯著特點而被普遍運用于自控領域的各個環(huán)節(jié)，發(fā)揮著巨大的作用。電磁閥是一-種流體控制閥，盡管其優(yōu)勢眾多，但選型的準確與否直接影響到閥門本身的使用效果及系統(tǒng)的穩(wěn)定，甚至會給整個自控系統(tǒng)帶來嚴重后果。較機械設備上常用的氣動電磁閥及液壓電磁閥相比，管路系統(tǒng)中的流體電磁閥在選型上及使用上均比單一介質(zhì)復雜許多。
DB/DBW型先導式溢流閥
1.結(jié)構分析
DB和DBW型壓力控制閥是先導式溢流閥。它們用于限制( DB型),或用電磁鐵限制及卸荷系統(tǒng)壓力( DBW型)
該溢流閥(DB型)的組成主要包括帶主閥芯插件(3)的主閥(1)和帶壓力調(diào)節(jié)組件的先導閥(2 ) DB型溢流閥油路A中的壓力作用于主閥芯( 3 )上。同時,壓力經(jīng)帶節(jié)流孔(4)和(5 )的控制通路(6 )和( 7 ),作用在主閥芯( 3 )的彈簧加載側(cè)及先導閥(2)的球(8)上。
如果A口的壓力超過彈簧(9)的設定值,球(8)克服彈簧力(9)而使先導閥開啟。該信號經(jīng)控制信道( 10 )和(6 )從A口內(nèi)部獲取。主閥芯(3 )彈簧加載側(cè)的油液經(jīng)過控制通路(7 )節(jié)流孔(11 )和球閥(8 )流入彈簧腔( 12)對DB..5*/.- .型它由控制通路( 13 )內(nèi)部引入油箱, 而對DB.. 5...型經(jīng)控制通路( 14 )它由外部弓入油箱。節(jié)流孔(4 )和(5 )在主閥芯(3 )兩端產(chǎn)生壓降,因此A到B連接通道被打開。油液由A口流向B口,而設定工作壓力保持不變。
溢流閥借助油口X ( 15 )可對不同壓力(二級壓力)卸荷或切換。
4、ZDR 6 D型減壓閥
1.結(jié)構分析
ZDR 6 D型減壓閥是疊加式結(jié)構三通直動式減壓閥,它對次級回路有減壓功能。用于系統(tǒng)壓力減壓。
其組成主要包括閥體( 1 )控制閥芯( 2 )壓縮彈簧( 3 )和調(diào)節(jié)組件(4 )以及可選單向閥。由調(diào)節(jié)組件( 4)設定二次壓力。DA型在靜態(tài)位置,該閥常開, 油液可自由地從油口A1流向油口A2。油口A2壓力經(jīng)控制油路( 5 )同時作用于壓縮彈簧對面的活塞面積上。當油口A2的壓力超過彈簧(3 )設定值時， 控制閥芯(2 )移至控制位置,油口A2的壓力保持穩(wěn)定。
信號和控制油經(jīng)控制油道( 5 )從油口A2內(nèi)部提供。如果油口A2的壓力由于外力作用于執(zhí)行器而繼續(xù)升高，閥芯就繼續(xù)向壓縮彈簧(3 )方向移動。這樣油口A2經(jīng)控制活塞(2)上的臺肩(9 )與油箱連通。足夠的油液流回油箱,以防止壓力進一-步升高。彈簧腔(7 )經(jīng)孔(6 )至油口T ( Y )由外部泄油至油箱。
壓力表接口(8 )用于閥的二次壓力監(jiān)測。
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液壓是機械行業(yè)、機電行業(yè)的一個名詞。液壓可以用動力傳動方式， 成為液壓傳動。液壓也可用作控制方式，稱為液壓控制。
液壓傳動是以液體作為工作介質(zhì)，利用液體的壓力能來傳遞動力。
液壓控制是以有壓力液體作為控制信號傳遞方式的控制。用液壓技術構成的控制系統(tǒng)稱為液壓控制系統(tǒng)。液壓挖制通常包括液壓開環(huán)挖制和液壓閉環(huán)控制。液壓閉環(huán)挖制也就是液壓伺服控制，它構成液壓伺服系統(tǒng)，通常包括電氣液壓伺服系統(tǒng)(電液伺服系統(tǒng))和機械液壓同服系統(tǒng)(機液伺服系統(tǒng)，或機液伺服機構)等。
一個完整的液壓系統(tǒng)由五個部分組成，即能源裝置、執(zhí)行裝置、控制調(diào)節(jié)裝置、輔助裝置、液體介質(zhì)。液壓由于其傳遞動力大，易于傳遞及配置等特點，在工業(yè)、民用行業(yè)應用廣泛。液壓系統(tǒng)的執(zhí)行元件(液壓缸和液壓馬達)的作用是將液體的壓力能轉(zhuǎn)換為機械能，從而獲
得需要的直線往復運動或回轉(zhuǎn)運動。液壓系統(tǒng)的能源裝置(液壓泵)的作用是將原動機的機械能轉(zhuǎn)換成液體的壓力能。
液壓系統(tǒng)組成
一個完整的液壓系統(tǒng)由五個部分組成，即動力元件、執(zhí)行元件、控制元件、輔助元件和工作介質(zhì)。
動力元件的作用是將原動機的機械能轉(zhuǎn)換成液體的壓力能。動力元件指液壓系統(tǒng)中的液壓泵，它向整個液壓系統(tǒng)提供動力。液壓泵的結(jié)構形式一般有齒輪泵、葉片泵、柱塞泵、螺桿泵。
執(zhí)行元件的作用是將液體的壓力能轉(zhuǎn)換為機械能，驅(qū)動負載作直線往復運動或回轉(zhuǎn)運動。執(zhí)行元件有液壓缸和液壓馬達。
挖制元件(即各種液壓閥)在液壓系統(tǒng)中控制和調(diào)節(jié)液體的壓力、流量和方向。
根據(jù)控制功能的不同，液壓閥可分為壓力控制閥、流量挖制閥和方向控制閥。壓力挖制閥又分為溢流閥(安全閥)、減壓閥、順序閥、壓力繼電器等:流量控制閥包括節(jié)流閥、調(diào)整閥、分流集流閥等:方向控制閥包括單向閥、液挖單向閥、梭閥、換向閥等。根據(jù)控制方式不同，
液壓閥可分為開關式控制閥、定值控制閥和比例控制閥。
輔助元件包括蓄能器、過濾器、冷卻器、加熱器、油管、管接頭、油箱、壓力計、流量計、
密封裝置等，它們起連接、儲油、過濾和測量油液壓力等輔助作用
工作介質(zhì)是指各類液壓傳動中的液壓油或乳化液，有各種礦物油、乳化液和合成型液壓油等
幾大類。液壓系統(tǒng)就是通過其實現(xiàn)運動和動力傳遞的。
液壓元件可分為動力元件和挖制元件以及執(zhí)行元件三大類。盡管都是液壓元件，它們的自身
功能和安裝使用的技術要求也不盡相同，現(xiàn)分別介紹如下:
動力元件:指的是各種液壓泵，齒輪泵、葉片泵、柱塞泵、螺桿泵。
1、齒輪油泵和串聯(lián)泵(包括外嚙合與內(nèi)嚙合)兩種結(jié)構型式。
2、葉片油泵(包括單級泵、變量泵、雙級泵、雙聯(lián)泵)。
3、柱塞油泵，又分為軸向柱塞油泵和徑向柱塞油泵，軸向柱塞泵有定量泵、變量泵、(變量泵又分為手動變量與壓力補償變量、伺服變量等多種)從結(jié)構上又分為端面配油和閥式配油兩種配油方式，而徑向柱塞泵的配油型式，基本上為閥式配油。);
執(zhí)行元件:液壓缸和液壓馬達，液壓缸有活塞液壓缸、柱塞液壓缸、擺動液壓缸、組合液壓缸:液壓馬達有齒輪式液壓馬達、葉片液壓馬達、柱塞液壓馬達:
控制元件: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、壓力繼電器等:
流量控制閥:節(jié)流閥、調(diào)速閥、分流闕:
輔助元件:除上述三部分以外的其它元件，包括壓力表、濾油器、蓄能裝置、冷卻器、管件{主要包括:各種管接頭 (擴口式、 焊接式、卡套式，sae法蘭)、高壓球閥、快換接頭、軟管總成、測壓接頭、管夾等}及油箱等，它們同樣十分重要。
