SV20PA1-4X液控單向閥

SV20PA1-4X液控單向閥 德國力士樂REXROTH液壓控制閥 

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SV20PA1-4X液控單向閥

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(gè)控制油路K，當(dāng)控制油路未接通壓力油液時(shí)，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(dòng)。當(dāng)控制油路有控制壓力輸入時(shí)，活塞頂桿在壓力油作用下向右移動(dòng)，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(dòng)。

液控單向閥是方向控制閥中的一種。具體分類：

方向控制閥按其在液壓系統(tǒng)中的功能分為單向閥和換向閥兩大類。

單向閥在液壓傳動(dòng)中有普通單向閥和液控單向閥。

單向閥主要特點(diǎn)

(1)保持壓力。

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

(3)實(shí)現(xiàn)液壓缸鎖緊。

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

(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(shí)，液壓缸右腔排油量驟然加大，此時(shí)若采用小流量的滑閥，會(huì)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(shí)，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(jì)液壓回路時(shí)，有時(shí)可將液控單向閥組合成換向閥使用。例如：用兩個(gè)液控單向閥和一個(gè)單向閥并聯(lián)（單向閥居中），則相當(dāng)于一個(gè)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(shí)，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(xiàng)。

(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(shí)，則要分析主系統(tǒng)壓力的變化對(duì)控制油路壓力的影響，以免出現(xiàn)液控單向閥的誤動(dòng)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(duì)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(shí)，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(dòng)和噪聲。

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R901406522 SL10PA1-4X=VJ50

R900442260 SL10PA2-4X/

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R900599830 SL10PA2-4X/SO251

R900586396 SL10PA2-4X/V

R900443418 SL10PA3-4X/

R901341937 SL10PA3-4X/J50

R900504957 SL10PA3-4X/V

R901429658 SL10PA3-4X/VJ3

R900419510 SL10PA4-4X/

R900020963 SL10PA4-4X/J

R901141208 SL10PA4-4X/JV

R900403579  SL10PA4-4X/V

R901430215  SL10PA4-4X/VJ3

R900443419  SL10PB1-4X/

R900058130  SL10PB1-4X/SO313

R900403795  SL10PB1-4X/J

R900532365  SL10PB1-4X/SO257

R900449987  SL10PB1-4X/SO96

R900079790  SL10PB1-4X/SO97

R900481121  SL10PB1-4X/SO97

R900406641  SL10PB1-4X/V

R900457386  SL10PB2-4X/

R900514645  SL10PB2-4X/V

R900438637  SL10PB3-4X/

R901426805  SL10PB3-4X/QMG24

R901426828  SL10PB3-4X/QMG24V

R901121247  SL10PB3-4X/V

R901430220  SL10PB3-4X/VJ3

R901301264  SL10PB3-4X/VJ50

R900451335  SL10PB4-4X/

R900527575  SL10PB4-4X/V

R983040138  SL10GA1-4XIN010

R983040139  SL10GA2-4XIN010

R983040140  SL10GA3-4X/IN010

R983040141  SL10GB1-4XIN010

R983040142  SL10GB24XIN010

R983040143  SL10GB3-4XIN010

R983040144  SL10GB4-4X/IN010

R983040145  SL10PA1-4XIN010

R983040146  SL10PA1-4X/VIN010

R983040147  SL10PA2-4XIN010

R983040148  SL10PA2-4X/VIN010

R983040149  SL10PA3-4XIN010

R983040150  SL10PA4-4XIN010

R983040151  SL10PB1-4XIN010

R983040152  SL10PB1-4X/VIN010

R983040153  SL10PB2-4XIN010

R983040154  SL10PB3-4XIN010

R983030717  SL10PB4-4X/IN010

R983030717  SL10PB4-4X/IN010

R978014265  SL10GA2-4X/V/12

R978878966  SL10GB2-4X/12

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