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先導(dǎo)型溢流閥的特點(diǎn)
先導(dǎo)閥和主閥閥芯分別處于受力平衡，其閥口都滿足壓力流量方程。閥的進(jìn)口壓力由兩次比較得到，壓力值主要由先導(dǎo)閥調(diào)壓彈簧的預(yù)壓縮量確定，主閥彈簀起復(fù)位作用。
通過先導(dǎo)閥的流量很小，是主閥額定流量的1%因此其尺寸很小，即使是高壓閥，其彈簧剛度也不大。這樣一來閥的調(diào)節(jié)性能有很大改善。
主閥芯開啟是利用液流流經(jīng)阻力孔形成的壓力差。阻力孔一般為細(xì)長孔，孔徑很小0=0.8~1.2mm,孔長I = 8~12mm,因此工作時易堵塞，一旦堵塞則導(dǎo)致主閥口常開無法調(diào)壓。

先導(dǎo)型溢流閥遙控口接法
先導(dǎo)閥前腔有一遙控口，在該控制口接遠(yuǎn)程調(diào)壓閥可實(shí)現(xiàn)遠(yuǎn)控，接電磁閥通回油箱可實(shí)現(xiàn)卸載。
遠(yuǎn)程調(diào)壓閥實(shí)際上是一個獨(dú)立的壓力先導(dǎo)閥，旁接在先導(dǎo)型溢流閥遙控口起遠(yuǎn)程調(diào)壓作用，其調(diào)定壓力必須低于先導(dǎo)閥的調(diào)定壓力。無論哪個起作用，泵的溢流量始終經(jīng)主閥閥口回油箱。

溢流閥的功用
溢流閥旁接在泵的出口，用來保證系統(tǒng)壓力恒定，稱為定壓閥。
溢流閥旁接在泵的出口，用來限制系統(tǒng)壓力的*大值，對系統(tǒng)起保護(hù)作用，稱為安全閥。
電磁溢流閥還可以在執(zhí)行機(jī)構(gòu)不工作時使泵卸載。

直動式溢流閥
調(diào)壓范圍:在規(guī)定的范圍內(nèi)調(diào)節(jié)時，閥的輸出壓力能平穩(wěn)的升降，無突跳或遲滯現(xiàn)象。
壓力流量特性:
溢流閥的進(jìn)口壓力隨流量變化而波動的性能;又稱為啟閉特性。
(p;-Pk)、(p;-Pp) 稱為調(diào)壓偏差，調(diào)壓偏差小好
nk=P/p。稱為開啟壓力比，
np=P/p。稱為閉合壓力比，nk、n,大好。
壓力損失和卸載壓力:當(dāng)調(diào)壓彈簧預(yù)壓縮量等于零或主閥上腔經(jīng)遙控口直接接回油箱時，流經(jīng)閥的流量為額定值時，溢流閥的進(jìn)口壓力。壓力損失略高于卸載壓力。

減壓閥
減壓閥是利用液流流過縫隙產(chǎn)生壓力損失，使其出口壓力低于進(jìn)口壓力的壓力控制閥。
按調(diào)節(jié)要求不同，有定值減壓閥，定差減壓閥，定比減壓閥。
定值減壓閥的結(jié)構(gòu)原理
減壓閥起減壓作用且保證出口壓力為定值的條件是:當(dāng)出口壓力大于減壓閥的調(diào)定壓力，使其先導(dǎo)閥開啟。
直動式減壓閥
減壓閥的功用與特點(diǎn)：
減壓閥用在液壓系統(tǒng)中獲得壓力低于系統(tǒng)壓力的二次油路上
與溢流閥比較:
減壓閥是出口壓力控制，保證出口壓力為定值;溢流閥是進(jìn)口壓力控制，保證進(jìn)口壓力為定值。
減壓閥閥口常開;
溢流閥閥口常閉。
減壓閥有單獨(dú)的泄油口;溢流閥彈簧腔的泄漏油經(jīng)閥體
內(nèi)流道內(nèi)泄至出口。
減壓閥與溢流閥-樣有遙控口。

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(dú)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。

內(nèi)控內(nèi)泄順序閥與外控順序閥
內(nèi)控內(nèi)泄順序閥的圖形符號和工作原理與溢流閥相同。
多串聯(lián)在液壓系統(tǒng)的回油路上，使回油具有一定壓力。
外控內(nèi)泄順序閥等同于二位二通閥，可作卸載閥。
外控外泄順序閥可作液動開關(guān)和限速鎖。
壓力繼電器
壓力繼電器是一種將液壓系統(tǒng)的壓力信號轉(zhuǎn)換為電信號輸出的元件。
其作用是實(shí)現(xiàn)執(zhí)行元件的順序控制或安全保護(hù)。
柱塞式壓力繼電器的結(jié)構(gòu)原理


RQM*-P型閥是一種溢流閥，具有三種流量規(guī)格，大流量為500 l/min。該閥可選用CETOP 安裝底板。適用該閥由于選用電磁閥的型號不同，可分為5種型式，其具有卸載和3種壓力值選擇功能。二級和三級的壓力值的調(diào)節(jié)值可通過連接主閥和電磁閥的溢流閥設(shè)定。通常供貨時帶六角調(diào)整螺釘。若需要還可裝配SICBLOC調(diào)整旋鈕調(diào)整主壓力。


CRQ型閥是一種插裝式先導(dǎo)壓力控制閥，它可以安裝在具有D-10C閥座孔的集成塊式閥板上。型底座上。該閥通常用于控制液壓閥的壓力，在壓力接近設(shè)定值時，仍然可以使泵在滿流量下工作。該閥提供四種壓力調(diào)整范圍，大壓力 350 bar。該閥由平衡型主閥和一個先導(dǎo)閥組成。主閥通常處于封閉狀態(tài)，當(dāng)回路壓力超過由先導(dǎo)閥設(shè)定的值時，主閥打開，油液通過 T 口直接回油箱。可用調(diào)整螺釘改變設(shè)定壓力，通常用內(nèi)六角螺釘，同時裝有鎖緊螺母和大調(diào)節(jié)限位器。

順序閥是指在具有二個以上分支回路的系統(tǒng)中，根據(jù)回路的壓力等來控制執(zhí)行元件動作順序的閥。該閥還可作為卸荷閥和背壓閥使用。
按工作原理和結(jié)構(gòu)，順序閥分直動式和先導(dǎo)式兩類；按壓力控制方式，順序閥有內(nèi)控和外控之分。 在順序閥中裝有單向閥，能通過反向液流的復(fù)合閥稱為單向順序閥。一般說來，這種閥使用較多。

順序閥的基本功能是控制多個執(zhí)行元件的順序動作，根據(jù)其功能的不同，分別稱為順序閥、背壓閥、卸荷閥和平衡閥。 順序閥的性能與溢流閥基本相同，但由于功能的不同，對順序閥還有其特殊的要求：
（1）為了使執(zhí)行元件準(zhǔn)確實(shí)現(xiàn)順序動作，要求順序閥的調(diào)壓精度高，偏差小；
（2）為了順序動作的準(zhǔn)確性，要求閥關(guān)閉時內(nèi)泄漏量小；
（3）對于單向順序閥，要求反向壓力損失及正向壓力損失值均應(yīng)較小。 順序閥的主要作用有：
（1）控制多個元件的順序動作；
（2）用于保壓回路；
（3）防止因自重引起油缸活塞自由下落而做平衡閥用；
（4）用外控順序閥做卸荷閥，使泵卸荷；
（5）用內(nèi)控順序閥作背壓閥。


順序閥根據(jù)裝配結(jié)構(gòu)的不同，可以實(shí)現(xiàn)不同的回路功能，如溢流閥、順序閥和平衡閥的功能。
順序閥的啟閉特性如果太差，則流量較大時一次壓力過高，回路效率降低。啟閉特性帶有滯環(huán)，開啟壓力低于閉合壓力，負(fù)載流量變化時應(yīng)予注意。開啟壓力過低的閥，再壓力低于設(shè)定壓力時發(fā)生前漏，引起執(zhí)行器誤動作。通過閥的流量遠(yuǎn)小于額定流量時，產(chǎn)生振動或其他不穩(wěn)定現(xiàn)象。此時要再回路上采取措施。
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R987113031 DBDS6G1X/400/RR4-4513
R900441883 DBDS10G1X/
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R900916880 DBDS10G1X/100-075/12
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R901020237 DBDS10G1X/100-30/59
R901005956 DBDS10G1X/100-35
R901156100 DBDS10G1X/100-40
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R901060953 DBDS10G1X/100-55
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R900423746 DBDS10G1X/100B
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R901052283 DBDS10G1X/100J=TE
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R900424739 DBDS10G1X/100V
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R900429968 DBDS10G1X/170
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R900424140 DBDS10G1X/200
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R901347971 DBDS10G1X/200P140/12
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R900343963 DBDS10G1X/200V/12
R900475531 DBDS10G1X/200V/5
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R900572618 DBDS10G1X/220B
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R900572620 DBDS10G1X/240B
R900783238 DBDS10G1X/240E
R900423743 DBDS10G1X/25
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R900391770 DBDS10G1X/25SO60
R900401161 DBDS10G1X/25SO74
R900439333 DBDS10G1X/25W1
R900397355 DBDS10G1X/25W100
R900929857 DBDS10G1X/25-10
R900930354 DBDS10G1X/25-10V
R900913880 DBDS10G1X/25-20
R900923249 DBDS10G1X/25-20V
R900351411 DBDS10G1X/25/12
R900471709 DBDS10G1X/25/5
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R900572621 DBDS10G1X/250B
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R901053363 DBDS10G1X/25J=TE
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R900423889 DBDS10G1X/25V
R900346901 DBDS10G1X/25VW1
R900340153 DBDS10G1X/25V/12
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R901011611 DBDS10G1X/275E
R900572623 DBDS10G1X/280B
R900773229 DBDS10G1X/280E
R900572624 DBDS10G1X/300B
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R901402828 DBDS10G1X/305E
R900572289 DBDS10G1X/30B
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R900769607 DBDS10G1X/30VE
R901083276 DBDS10G1X/310E
R900424742 DBDS10G1X/315
R900332635 DBDS10G1X/315SO130
R900345136 DBDS10G1X/315SO150
R900587880 DBDS10G1X/315SO284
R900419721 DBDS10G1X/315SO60
R900587502 DBDS10G1X/315SO700
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R900560483 DBDS10G1X/315SO770
R900472760 DBDS10G1X/315W1
R901213049 DBDS10G1X/315-120
R901117166 DBDS10G1X/315-190
R901081750 DBDS10G1X/315-200
R900919942 DBDS10G1X/315-220
R900939820 DBDS10G1X/315-220V
R901036708 DBDS10G1X/315-235
R900915091 DBDS10G1X/315-250
R901216827 DBDS10G1X/315-250V
R900771754 DBDS10G1X/315-270
R900724592 DBDS10G1X/315-275
R900911873 DBDS10G1X/315-290V
R900377746 DBDS10G1X/315/12
R900470506 DBDS10G1X/315/5
R901095276 DBDS10G1X/315/59
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R900424824 DBDS10G1X/315B
R900427241 DBDS10G1X/315B
R900769430 DBDS10G1X/315E
R900474980 DBDS10G1X/315J
R900529736 DBDS10G1X/315J/12
R901052284 DBDS10G1X/315J=TE
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R900977655 DBDS10G1X/315P210
R900940050 DBDS10G1X/315P220
R901330999 DBDS10G1X/315P230
R901352219 DBDS10G1X/315P240
R901302328 DBDS10G1X/315P255
R901194874 DBDS10G1X/315P260
R901142133 DBDS10G1X/315P280
R901439772 DBDS10G1X/315P290
R900938747 DBDS10G1X/315P300
R900424743 DBDS10G1X/315V
R900340488 DBDS10G1X/315V/12
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R900572905 DBDS10G1X/330B
R900769509 DBDS10G1X/330E
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R900572906 DBDS10G1X/340B
R901004628 DBDS10G1X/340E
R901142782 DBDS10G1X/345E
R900572907 DBDS10G1X/350B
R901010969 DBDS10G1X/350E
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R900572290 DBDS10G1X/35B
R901004635 DBDS10G1X/360E
R900776416 DBDS10G1X/370E
R900572908 DBDS10G1X/375B
R901419086 DBDS10G1X/375E
R900424744 DBDS10G1X/400
R900340395 DBDS10G1X/400SO32
R900337132 DBDS10G1X/400W1
R901421159 DBDS10G1X/400-320
R900967544 DBDS10G1X/400-330
R901283265 DBDS10G1X/400-350
R900934571 DBDS10G1X/400-350V
R900558953 DBDS10G1X/400-370
R901243540 DBDS10G1X/400-400
R900342738 DBDS10G1X/400/12
R900482135 DBDS10G1X/400/12SO150
R900535540 DBDS10G1X/400/2
R900471909 DBDS10G1X/400/5
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R900381337 DBDS10G1X/400J
R900374117 DBDS10G1X/400JSO73
R901052290 DBDS10G1X/400J=TE
R901147801 DBDS10G1X/400P140
R901348424 DBDS10G1X/400P350V
R901055558 DBDS10G1X/400P370
R901356605 DBDS10G1X/400P400
R900437349 DBDS10G1X/400V
R900395060 DBDS10G1X/400V/12
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R900572966 DBDS10G1X/420B
R900773646 DBDS10G1X/420E
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R900979785 DBDS10G1X/440B
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R900572967 DBDS10G1X/450B
R900574646 DBDS10G1X/485B
R900424745 DBDS10G1X/50
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R900401662 DBDS10G1X/50SO50
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R900347687 DBDS10G1X/50/12
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R900465670 DBDS10G1X/50/5
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R900572968 DBDS10G1X/500B
R900520689 DBDS10G1X/500BSO999
R900769561 DBDS10G1X/500E
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R900423742 DBDS10G1X/50B
R900346412 DBDS10G1X/50B
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R900358827 DBDS10G1X/50V/12
R901131882 DBDS10G1X/50VE
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R900578531 DBDS10G1X/550B
R901000910 DBDS10G1X/550E
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R900572969 DBDS10G1X/600B
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R900423814 DBDS10G1X/630
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R900470981 DBDS10G1X/630SO48
R900461768 DBDS10G1X/630SO52
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R900496233 DBDS10G1X/700
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R900572350 DBDS10G1X/80B
R900423740 DBDS10G1X/80B
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R900423746 DBDS10G1A/100B
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R900424739 DBDS10G1A/100V
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R900572454 DBDS10G1A/130B
R900778044 DBDS10G1A/130E
R900921193 DBDS10G1A/130VB
R900572455 DBDS10G1A/135B
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R901026426 DBDS10G1A/140E
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R900429968 DBDS10G1A/170
R900429968 DBDS10G1A/170
R900370316 DBDS10G1A/170/5B
R900424808 DBDS10G1A/170B
R900773192 DBDS10G1A/170E
R900429947 DBDS10G1A/170VB
R900909997 DBDS10G1A/175B
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R900769606 DBDS10G1A/180E
R901235516 DBDS10G1A/180VE
R900572547 DBDS10G1A/190B
R901013662 DBDS10G1A/190E
R900424140 DBDS10G1A/200
R900433779 DBDS10G1A/200
R900340877 DBDS10G1A/200SO130
R900344863 DBDS10G1A/200SO15
R900493041 DBDS10G1A/200SO27
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R900400659 DBDS10G1A/200W1
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R900731004 DBDS10G1A/200-110
R901210090 DBDS10G1A/200-120
R901037453 DBDS10G1A/200-130
R900953705 DBDS10G1A/200-140
R900940672 DBDS10G1A/200-150
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R901117172 DBDS10G1A/200-165
R900962532 DBDS10G1A/200-170
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R901256664 DBDS10G1A/200-185
R900341591 DBDS10G1A/200/12
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R900442081 DBDS10G1A/200/2
R900470505 DBDS10G1A/200/5
R900946730 DBDS10G1A/200/50
R900572548 DBDS10G1A/200B
R900769540 DBDS10G1A/200E
R900458636 DBDS10G1A/200J
R900563775 DBDS10G1A/200J/12
R901052252 DBDS10G1A/200J=TE
R900520756 DBDS10G1A/200JV
R901240746 DBDS10G1A/200P100
R900951431 DBDS10G1A/200P140
R901347971 DBDS10G1A/200P140/12
R901355397 DBDS10G1A/200P160SO60
R900977656 DBDS10G1A/200P180
R900424741 DBDS10G1A/200V
R900391769 DBDS10G1A/200VSO60
R900343963 DBDS10G1A/200V/12
R900475531 DBDS10G1A/200V/5
R900940422 DBDS10G1A/200VB
R901014788 DBDS10G1A/200VE
R900572549 DBDS10G1A/205B
R900774958 DBDS10G1A/205E
R901229978 DBDS10G1A/210/12E
R900426099 DBDS10G1A/210B
R900769379 DBDS10G1A/210E
R900400298 DBDS10G1A/210VB
R901238752 DBDS10G1A/210VE
R901357023 DBDS10G1A/215E
R900572618 DBDS10G1A/220B
R900772319 DBDS10G1A/220E
R900941189 DBDS10G1A/220VB
R901378805 DBDS10G1A/220VE
R900572619 DBDS10G1A/230B
R900769565 DBDS10G1A/230E
R901395602 DBDS10G1A/230VE
R900572620 DBDS10G1A/240B
R900783238 DBDS10G1A/240E
R900423743 DBDS10G1A/25
R900338391 DBDS10G1A/25SO450
R900391770 DBDS10G1A/25SO60
R900401161 DBDS10G1A/25SO74
R900439333 DBDS10G1A/25W1
R900397355 DBDS10G1A/25W100
R900929857 DBDS10G1A/25-10
R900930354 DBDS10G1A/25-10V
R900913880 DBDS10G1A/25-20
R900923249 DBDS10G1A/25-20V
R900351411 DBDS10G1A/25/12
R900471709 DBDS10G1A/25/5
R900408790 DBDS10G1A/25/V/5
R900572621 DBDS10G1A/250B
R901012705 DBDS10G1A/250E
R901445518 DBDS10G1A/250VE
R900499604 DBDS10G1A/25J
R901053363 DBDS10G1A/25J=TE
R900903942 DBDS10G1A/25P15
R900423889 DBDS10G1A/25V
R900346901 DBDS10G1A/25VW1
R900340153 DBDS10G1A/25V/12
R900572622 DBDS10G1A/260B
R901309515 DBDS10G1A/260E
R900965654 DBDS10G1A/275B
R901011611 DBDS10G1A/275E
R900572623 DBDS10G1A/280B
R900773229 DBDS10G1A/280E
R900572624 DBDS10G1A/300B
R901124323 DBDS10G1A/300E
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液壓閥的分類:
1根據(jù)結(jié)構(gòu)形式分類
滑閥：滑閥為間隙密封，閥芯與閥口存在一定的密封長度，因此滑閥運(yùn)動存在一個死區(qū)。
錐閥：錐閥閥芯半錐角一 般為12°-20°，閥口關(guān)閉時為線密封，密封性能好且動作靈敏。
球閥：性能與錐閥相同
2.根據(jù)控制制方式不同分:
定值或開關(guān)控制閥:被控制量為定值的閥類，包括普通控制閥、插裝閥、疊加閥。
比例控制閥:被控制量與輸入信號成比例連續(xù)變化的閥類，包括普通比例閥和帶內(nèi)反饋的電液比例閥。
伺服控制閥:被控制量與(輸出與輸入之間的)偏差信號成比例連續(xù)變化的閥類，包括機(jī)液伺服閥和電液伺服閥。.
數(shù)字控制閥:用數(shù)字信息直接控制閥口的啟閉，來控制液流的壓力、流
量、方向的閥類。
3.根據(jù)用途分:
壓力控制閥、流量控制閥、方向控制閥
方向控制閥的作用:在液壓系統(tǒng)中控制液流方向。
方向控制閥包括:單向閥和換向閥
單向閥包括:普通單向閥和液控單向閥
1.普通單向閥
使油液只能沿一個方向流動，反向則被截止的方向閥。
普通單向閥的應(yīng)用
常被安裝在泵的出口，一方面防止壓力沖擊影響泵的正常工作，另一方面防止泵不工作時系統(tǒng)油液倒流經(jīng)泵回油箱。
被用來分隔油路以防止高低壓干擾。:
與其他的閥組成單向節(jié)流閥、單向減壓閥、單向順序閥等復(fù)合閥。
安裝在執(zhí)行元件的回油路上，使回油具有一定背壓。作背壓閥的單向閥應(yīng)更換剛度較大的彈簧，其正向開啟壓力為( 0. 3~0.5) MPa。
2.液控單向閥
外泄式液控單向閥，內(nèi)泄式單向閥
工作原理:當(dāng)控制油口不通壓力油時，油液只能從pi→P:當(dāng)控制油口通壓力油時，正、反向的油液均可自由通過。
3.換向閥
換向閥是利用閥芯在閥體孔內(nèi)作相對運(yùn)動，使油路接通或切斷而改變油流方向的閥。
換向閥的分類
按結(jié)構(gòu)形式可分:滑閥式、轉(zhuǎn)閥式、球閥式。
按閥體連通的主油路數(shù)可分:兩通、三通、四通...等。
按閥芯在閥體內(nèi)的工作位置可分:兩位、三位、四位等。
按操作閥芯運(yùn)動的方式可分:手動、機(jī)動、電磁動、液動、電液動等。
換向閥的中位機(jī)能，多位閥在不同工作位置時，各油口的連通方式體現(xiàn)了換向閥的不同的控制機(jī)能，稱之為換向閥的機(jī)能。對于三位閥，左、右位實(shí)現(xiàn)執(zhí)行元件的換向，中位則能滿足執(zhí)行元件處于非工作狀態(tài)時系統(tǒng)的不同要求。

4.壓力控制閥
壓力控制閥的作用:
1、用來控制液壓系統(tǒng)中油液壓力;
1)溢流閥：直動式溢流閥、先導(dǎo)式溢流閥
2)減壓閥
2、以壓力為控制信號實(shí)現(xiàn)油路通斷。
3)順序閥
4)壓力繼電器
共同工作原理:利用作用于閥心上的液壓力與彈簧力相平衡的原理進(jìn)行工作。
溢流閥應(yīng)用實(shí)例
(1)為定量泵系統(tǒng)溢流穩(wěn)壓和定量泵、節(jié)流閥并聯(lián)，閥口常開。
(2)變量泵系統(tǒng)提供過載保護(hù)
和變量泵組合，正常工作時閥口關(guān)閉，過載時打開，起安全保護(hù)作用,故又稱安全閥。
(3)實(shí)現(xiàn)遠(yuǎn)程調(diào)壓  p遠(yuǎn)程< p主調(diào)
(4)系統(tǒng)卸荷和多級調(diào)壓 和二位二通閥組合(先導(dǎo)式)
(5)形成背壓
減壓閥用于降低并穩(wěn)定系統(tǒng)中某一支路的油液壓力，常用于夾緊、控制等油路中。
順序閥是一種利用壓力控制閥口通斷的壓力閥，因用于控制多個執(zhí)行元件的動作順序而得名。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。
壓力繼電器功用:根據(jù)系統(tǒng)壓力變化,自動接通或斷開電路,實(shí)現(xiàn)程序控制或安全保護(hù)。
工作原理: pk> pT時，柱塞上升,發(fā)出信號pk< pT時，柱塞下降,斷開信號。

5.流量控制閥
功用:通過改變閥口過流面積來調(diào)節(jié)輸出流量，從而控制執(zhí)行元件的運(yùn)動速度。
分類:節(jié)流閥、調(diào)速閥、溫度補(bǔ)償調(diào)速閥、分流集流閥。
常用節(jié)流口結(jié)構(gòu)有錐形、三角槽形、矩形、三角形等。由節(jié)流方程知，當(dāng)壓力差.定時，改變開口面積即改變液阻就可改變流量。
節(jié)流閥實(shí)質(zhì)相當(dāng)于-一個可變節(jié)流口，借助控制機(jī)構(gòu)使閥芯相對于閥體孔運(yùn)動改變閥口的過流面積。
結(jié)構(gòu)原理
主要零件有閥芯、閥體和螺母。閥體上右邊是進(jìn)油口，左邊是出油口。閥芯一端開有三角尖槽，另-端加工有螺紋，旋轉(zhuǎn)閥芯即可軸向移動改變閥口過流面積。為平衡液壓徑向力，三角槽須對稱布置。
調(diào)速閥定差減壓閥與節(jié)流閥串聯(lián)而成，用來調(diào)節(jié)通過的流量自動補(bǔ)
償負(fù)載變化的影響。
插裝閥
上世紀(jì)70年代初發(fā)展起來的一種新元件，是古老錐閥的新應(yīng)用。配以蓋板、先導(dǎo)閥組成的-種多功能的復(fù)合閥。因每個插裝閥基本組件有且只有兩個油口，故被稱為二通插裝閥。
特點(diǎn):
閥芯為錐閥，密封性能好，且動作靈敏;
通流能力大，抗污染;
一閥多用，易組成各式系統(tǒng)，結(jié)構(gòu)緊湊。
特別對大流量及非礦物油介質(zhì)的場合，優(yōu)點(diǎn)更為突出。
插裝閥基本組件由閥芯、閥套、彈簀和密封圈組成。根據(jù)用途不同分為方向閥組件、壓力閥組件和流量閥組件。
插裝閥的應(yīng)用
單向閥
將方向閥組件的控制口通過閥塊和蓋板上的通道與油口A或B直接溝通，可組成單向閥。
二通閥
由一個二位三通電磁滑閥控制方向閥組件控制腔的通油方式，可組成二位二通閥。
三通閥
由兩個方向閥組件并聯(lián)而成，對外形成-一個壓力油口、-一個工作油口和一一個回油口。三通插裝閥的工作狀態(tài)數(shù)取決于先導(dǎo)換向閥的工作位置數(shù)。
四通閥由兩個三通閥并聯(lián)而成。
疊加閥以板式閥為基礎(chǔ)，每個疊加閥不僅起到單個閥的功能，而且還溝通閥與閥的流道。換向閥安裝在*上方，對外連接油口開在*下邊的底板上，其他的閥通過螺栓連接在換向閥和底板之間。
由疊加閥組成的系統(tǒng)結(jié)構(gòu)緊湊，配置靈活，設(shè)計(jì)制造周期短。