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二位四通電磁換向閥工業元件圖片(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中的典型應用是與溢流閥并聯組成卸荷回路。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流回油箱以節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。

電磁換向閥在液壓系統中的作用是用來實現液壓油路的換向、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中。
(1)結構原理
電磁換向閥是液壓控制系統和電氣控制系統之轉換元件。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，來實現油流的溝通、切斷和方向變換，來操縱各執行機構的動作。推動故障檢查按鈕可使滑閥閥芯手推移動。

電磁閥產品是自控系統中不可缺少的執行器元件。由于電磁閥體積小，開關速度快，接線簡單，功耗低，性價比高，經濟實用等顯著特點而被普遍運用于自控領域的各個環節，發揮著巨大的作用。電磁閥是一-種流體控制閥，盡管其優勢眾多，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的穩定，甚至會給整個自控系統帶來嚴重后果。較機械設備上常用的氣動電磁閥及液壓電磁閥相比，管路系統中的流體電磁閥在選型上及使用上均比單一介質復雜許多。

DB/DBW型先導式溢流閥
1.結構分析
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)和帶壓力調節組件的先導閥(2 ) DB型溢流閥油路A中的壓力作用于主閥芯( 3 )上。同時,壓力經帶節流孔(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。該信號經控制信道( 10 )和(6 )從A口內部獲取。主閥芯(3 )彈簧加載側的油液經過控制通路(7 )節流孔(11 )和球閥(8 )流入彈簧腔( 12)對DB..5*/.- .型它由控制通路( 13 )內部引入油箱, 而對DB.. 5...型經控制通路( 14 )它由外部弓入油箱。節流孔(4 )和(5 )在主閥芯(3 )兩端產生壓降,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.結構分析
ZDR 6 D型減壓閥是疊加式結構三通直動式減壓閥,它對次級回路有減壓功能。用于系統壓力減壓。
其組成主要包括閥體( 1 )控制閥芯( 2 )壓縮彈簧( 3 )和調節組件(4 )以及可選單向閥。由調節組件( 4)設定二次壓力。DA型在靜態位置,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的壓力保持穩定。
信號和控制油經控制油道( 5 )從油口A2內部提供。如果油口A2的壓力由于外力作用于執行器而繼續升高，閥芯就繼續向壓縮彈簧(3 )方向移動。這樣油口A2經控制活塞(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測。

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液壓是機械行業、機電行業的一個名詞。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，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稱為液壓控制系統。液壓挖制通常包括液壓開環挖制和液壓閉環控制。液壓閉環挖制也就是液壓伺服控制，它構成液壓伺服系統，通常包括電氣液壓伺服系統(電液伺服系統)和機械液壓同服系統(機液伺服系統，或機液伺服機構)等。
一個完整的液壓系統由五個部分組成，即能源裝置、執行裝置、控制調節裝置、輔助裝置、液體介質。液壓由于其傳遞動力大，易于傳遞及配置等特點，在工業、民用行業應用廣泛。液壓系統的執行元件(液壓缸和液壓馬達)的作用是將液體的壓力能轉換為機械能，從而獲
得需要的直線往復運動或回轉運動。液壓系統的能源裝置(液壓泵)的作用是將原動機的機械能轉換成液體的壓力能。
液壓系統組成
一個完整的液壓系統由五個部分組成，即動力元件、執行元件、控制元件、輔助元件和工作介質。
動力元件的作用是將原動機的機械能轉換成液體的壓力能。動力元件指液壓系統中的液壓泵，它向整個液壓系統提供動力。液壓泵的結構形式一般有齒輪泵、葉片泵、柱塞泵、螺桿泵。
執行元件的作用是將液體的壓力能轉換為機械能，驅動負載作直線往復運動或回轉運動。執行元件有液壓缸和液壓馬達。
挖制元件(即各種液壓閥)在液壓系統中控制和調節液體的壓力、流量和方向。

根據控制功能的不同，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:流量控制閥包括節流閥、調整閥、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。液壓系統就是通過其實現運動和動力傳遞的。
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、齒輪油泵和串聯泵(包括外嚙合與內嚙合)兩種結構型式。
2、葉片油泵(包括單級泵、變量泵、雙級泵、雙聯泵)。
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:節流閥、調速閥、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。