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SV30GB1-4X液控單向閥

液控單向閥主要特點

(1)保持壓力。

滑閥式換向閥都有間隙泄漏現(xiàn)象，只能短時間保壓。當(dāng)有保壓要求時，可在油路上加一個液控單向閥，利用錐閥關(guān)閉的嚴(yán)密性，使油路長時間保壓。

(2)液壓缸的“支承”。

在立式液壓缸中，由于滑閥和管的泄漏，在活塞和活塞桿的重力下，可能引起活塞和活塞桿下滑。將液控單向閥接于液壓缸下腔的油路，則可防止液壓缸活塞和滑塊等活動部分下滑。

(3)實現(xiàn)液壓缸鎖緊。

當(dāng)換向閥處于中位時，兩個液控單向閥關(guān)閉，可嚴(yán)密封閉液壓缸兩腔的油液，這時活塞就不能因外力作用而產(chǎn)生移動。

(4)大流量排油。

液壓缸兩腔的有效工作面積相差很大。在活塞退回時，液壓缸右腔排油量驟然加大，此時若采用小流量的滑閥，會產(chǎn)生節(jié)流作用，限制活塞的后退速度；若加設(shè)液控單向閥，在液壓缸活塞后退時，控制壓力油將液控單向閥打開，便可以順利地將右腔油液排出。

(5)作充油閥。

立式液壓缸的活塞在高速下降過程中，因高壓油和自重的作用，致使下降迅速，產(chǎn)生吸空和負(fù)壓，必須增設(shè)補(bǔ)油裝置。液控單向閥作為充油閥使用，以完成補(bǔ)油功能。

(6)組合成換向閥。

在設(shè)計液壓回路時，有時可將液控單向閥組合成換向閥使用。例如：用兩個液控單向閥和一個單向閥并聯(lián)（單向閥居中），則相當(dāng)于一個三位三通換向閥的換向回路。需要指出，控制壓力油油口不工作時，應(yīng)使其通回油箱，否則控制活塞難以復(fù)位，單向閥反向不能截止液流。

注意事項。

(1)必須保證液控單向閥有足夠的控制壓力，較好不允許控制壓力失壓。應(yīng)注意控制壓力是否滿足反向開啟的要求。如果液控單向閥的控制引自主系統(tǒng)時，則要分析主系統(tǒng)壓力的變化對控制油路壓力的影響，以免出現(xiàn)液控單向閥的誤動作。

(2)根據(jù)液控單向閥在液壓系統(tǒng)中的位置或反向出油腔后的液流阻力（背壓）大小，合理選擇液控單向閥的結(jié)構(gòu)（簡式或復(fù)式）及泄油方式（內(nèi)泄或外泄）。對于內(nèi)泄式液控單向閥來說，當(dāng)反向油出口壓力超過一定值時，液控部分將失去控制作用，故內(nèi)泄式液控單向閥一般用于反向出油腔無背壓或背壓較小的場合；而外泄式液控單向閥可用于反向出油腔背壓較高的場合，以降低較小的控制壓力，節(jié)省控制功率。系統(tǒng)若采用內(nèi)卸式，則柱塞缸將斷續(xù)下降發(fā)出振動和噪聲。

液控單向閥是依靠控制流體壓力，可以使單向閥反向流通的閥。這種閥在煤礦機(jī)械的液壓支護(hù)設(shè)備中占有較重要的地位。液控單向閥與普通單向閥不同之處是多了一個控制油路K，當(dāng)控制油路未接通壓力油液時，液控單向閥就象普通單向閥一樣工作，壓力油只從進(jìn)油口流向出油口，不能反向流動。當(dāng)控制油路有控制壓力輸入時，活塞頂桿在壓力油作用下向右移動，用頂桿頂開單向閥，使進(jìn)出油口接通。若出油口大于進(jìn)油口就能使油液反向流動。

SV30GB1-4X液控單向閥

型號SV和SL閥是錐閥結(jié)構(gòu)的液控單向閥，它可在關(guān)閉方向開啟而讓油液自由流動。

此類閥用于有液壓回路部分的隔離，當(dāng)管路破裂時，作為防止負(fù)載失壓的安全措施，或避免執(zhí)行器在液壓閉鎖時的爬行或漂移。

其組成主要包括閥體、閥芯 、壓縮彈簧和控制活塞和一個可選的釋壓球閥。

型號SV...

油液可以由A至B自由流動。在相反方向，閥芯被壓縮彈簧和系統(tǒng)壓力牢固的保持在其閥座上。

通過向控制口X提供壓力，控制活塞被推向右側(cè)。這樣閥芯離開閥座，油液由B至A流動。

為了確保閥開啟，需要一定的低控制壓力作用于控制活塞上

為了確保通過施加到控制閥芯上壓力閥能打開，要求一定的小先導(dǎo)壓力

型號SV..A..和SL..A.. (帶卸壓功能，)

該閥有一個附加的印載機(jī)構(gòu)，當(dāng)向X口提供控制壓力時，控制活塞被推向右側(cè)。它首先推開球閥芯，然后主閥芯離開其閥座。這樣，油液從B流向A,從而避免可能的壓力沖擊。

由于這種預(yù)開啟特征，可以實現(xiàn)缸中受壓液體的平穩(wěn)釋壓。

型號SL..

此閥的功能與SV型相同。

不同之處在于增加了泄油口Y。此處控制活塞 的環(huán)形面積與A口隔離。來自A口的壓力只作用于控制活塞 的面積A_上。

SV30GB1-4X液控單向閥型號型號

力士樂REXROTH液控單向閥SV 6

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順序閥

順序閥是一種利用壓力控制閥口通斷的壓力閥。

按控制油來源不同分內(nèi)控和外控，按彈簧腔泄漏油引出方式不同分內(nèi)泄和外泄。

順序閥的四種控制方式

通過改變上蓋或底蓋的裝配位置可得到內(nèi)控外泄、內(nèi)控內(nèi)泄、外控外泄、外控內(nèi)泄四種類型。

內(nèi)控外泄順序閥

內(nèi)控外泄順序閥與溢流閥非常相象:閥口常閉，進(jìn)口壓力控制，但是該

閥出口油液要去工作，所以有單獨的泄油口。

內(nèi)控外泄順序閥用于多個執(zhí)行元件順序動作。其進(jìn)口壓力先要達(dá)到閥的調(diào)定壓力，而出口壓力取決于負(fù)載。當(dāng)負(fù)載壓力高于閥的調(diào)定壓力時，進(jìn)口壓力等于出口壓力，閥口全開;當(dāng)負(fù)載壓力低于調(diào)定壓力時，進(jìn)口壓力等于調(diào)定壓力，閥的開口一定。