力士樂減壓閥ZDR10DP2-5X/210YMV現(xiàn)貨型號
力士樂減壓閥是通過調(diào)節(jié)將進(jìn)口壓力減少到必要的出口壓力,并依賴介質(zhì)本身的能量自動(dòng)保持穩(wěn)定。通過改變節(jié)流面積,使流動(dòng)速度和動(dòng)能發(fā)生變化,產(chǎn)生不同壓力,從而實(shí)現(xiàn)減壓。然后,通過與控制的調(diào)節(jié),使閥后壓力的變動(dòng)和彈簧力平衡,使閥后壓力在一定的誤差范圍內(nèi)保持一定,從而保護(hù)液壓系統(tǒng)對應(yīng)回路。
力士樂減壓閥主要由閥體、閥芯、壓縮彈簧、壓力調(diào)節(jié)裝置以及單向閥組成。無油狀態(tài)下,常開油液從OB腔自由流至油口B1腔。在壓彈簧對面的閥芯左側(cè),通過控制油路作用于閥芯。控制閥芯在油口B1腔壓力大于彈簧的設(shè)定值時(shí),使閥芯在調(diào)節(jié)區(qū)內(nèi)運(yùn)動(dòng),使B1腔壓力保持不變。當(dāng)B1腔的壓力繼續(xù)上升時(shí),閥芯移至使孔洞流向T腔,P1壓力不再上升,從而實(shí)現(xiàn)過載保護(hù)。漏出油經(jīng)彈簧腔將油液排放至油箱。
力士樂減壓閥也分為直動(dòng)式和先導(dǎo)式兩種,一般常用力士樂先導(dǎo)式減壓閥。圖5-15(a)所示為先導(dǎo)式減壓閥的結(jié)構(gòu)口一次壓力油p1由進(jìn)油口進(jìn)人。經(jīng)減壓口變?yōu)镻2從出油口流出,P2同時(shí)經(jīng)閥體6下部和端蓋8.上通道至主閥芯7下腔,并通過主閥芯上的阻尼孔9作用于先導(dǎo)閥3的右腔,然后通過錐閥座4的阻尼孔作用在錐閥上。當(dāng)出口壓力P2于調(diào)定值時(shí)。錐閥關(guān)閉、主閥芯上下腔油壓相等,彈簧10使主閥芯處于下端.閥口全開,不起減壓作用。當(dāng)力士樂減壓閥的出口壓力上升至超過調(diào)壓彈簧11所調(diào)定的壓力時(shí).錐閥打開。油液經(jīng)先導(dǎo)閥和泄油日流回油箱,由于阻尼孔的作用產(chǎn)生壓降,當(dāng)主閥芯上下腔的壓差作用力大于彈簧10的預(yù)緊力時(shí),主閥芯7上升使減壓口縫隙減小,液阻增大.致使出口壓力P2下降。反之,則使出口回升。這樣就能夠通過自動(dòng)調(diào)節(jié)閥口開度,來保持出口壓力穩(wěn)定在調(diào)定值上。力士樂減壓閥的閥口為常開型。由于進(jìn)出油口均接壓力油,所以泄油口要單獨(dú)接油箱。調(diào)節(jié)先導(dǎo)閥彈簧壓緊力就可以調(diào)節(jié)力士樂減壓閥控制壓力。
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