力士樂(lè)插裝式單向閥M-SR8KE05-1X/ R900346083，德國(guó)REXROTH插裝式單向閥，購(gòu)買(mǎi)進(jìn)口液壓、氣動(dòng)、自動(dòng)化控制工業(yè)配件，
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六、單向閥、液控單向閥、SV/SL型液控單向閥、疊加式液控單向閥
1.結(jié)構(gòu)和工作原理
單向閥又稱(chēng)止回閥或逆止閥。用于液壓系統(tǒng)中防止油流反向流動(dòng)。單向閥有直通式和直角式兩種。如圖15、圖16所示。
SV和SL型液控單向閥都是座式閥，由液壓開(kāi)啟，能給出反向流。
這種閥用來(lái)隔離局部壓力回路，即作為在管子破裂時(shí)防止負(fù)載降落的保護(hù)，也可防止負(fù)載下爬。這種液控單向閥主要包括閥體、主閥、先導(dǎo)閥、壓縮彈簧和控制活塞 。
SV型閥(無(wú)泄油口)一一泄漏油內(nèi)部回油
由A口至B口始終可以流動(dòng)。反方向上則導(dǎo)閥和主閥被壓縮彈簧和系統(tǒng)壓力保持在閥座上。若X口供給壓力油則控制活塞被推向右。
這首先打開(kāi)導(dǎo)閥，然后打開(kāi)主閥。于是油液先通過(guò)導(dǎo)閥，然后通過(guò)主
導(dǎo)閥。為了保證用控制活塞能可靠地操縱，需要一定的*低控制壓力。
SL型閥(帶泄油口)-一-泄漏油外部回油
在原理上，此閥與SV型有相同的功能。不同之處在于增加了泄油口Y,這就可使控制活的環(huán)形面積與A口隔離。A口來(lái)的油壓只作用在控制活塞的面積A4上，從而有效地降低此條件下所需的控制壓力。
Z2S型疊加式液控單向閥
Z2S型單向閥是疊加式液控單向閥。它可用于關(guān)閉一個(gè)或兩個(gè)工作油口，無(wú)泄漏持續(xù)時(shí)間長(zhǎng)，穩(wěn)定性好。
油液從A到A1或B到B1自由流通，反向則被截止。如果油流通過(guò)閥，例
如從A到A1，壓力油作用在閥芯上，閥芯則向右運(yùn)動(dòng)并推動(dòng)鋼球離開(kāi)閥座。單向閥被控制油打開(kāi)時(shí)，油可從B1到B流通。壓力在B1腔卸荷，單向閥全部開(kāi)啟。為保證兩個(gè)主單向閥在換向閥中位時(shí)能可靠的關(guān)閉，閥的A、B口與回油路連接。
2.單向閥的主要故障
單向閥可能出現(xiàn)的*主要的故障，是當(dāng)油液從P2腔反向進(jìn)入時(shí)，錐閥芯(或鋼球)不能將油液嚴(yán)格封閉而產(chǎn)生滲漏。這種滲漏現(xiàn)象更容易出現(xiàn)在反向流油的壓力比較低的情況。這時(shí)需要檢查閥芯錐面(或鋼球)與閥座的接觸是否緊密;或檢查閥座孔與閥芯孔是否保證所需要的同軸度要求，或者當(dāng)閥座壓入閥體孔時(shí)有沒(méi)有壓歪。如不符合要求，則需將閥芯錐面(或鋼球)與閥座重新配研，或者將閥座拆出重新壓裝，直到與閥芯錐面(或鋼球)嚴(yán)密接觸為止。
另外單向閥的閥座或閥套與閥體間的密封裝配或拆裝時(shí)擠傷，而造成內(nèi)部泄漏。
如果單向閥啟閉不靈活，這種閥芯有卡阻現(xiàn)象，則需檢查閥體孔與閥芯的加工幾何精度，以及二者的配合間隙是否符合要求。這種現(xiàn)象有可能出現(xiàn)于正向開(kāi)啟壓力很小的單向閥，或者這種開(kāi)啟壓力很小的單向閥是閥芯軸線(xiàn)沿水平方向安裝使用時(shí)的場(chǎng)合;另外，也應(yīng)檢查彈簧是否斷裂或者過(guò)分彎曲而引起卡阻。這里應(yīng)該注意的是，不論是直通型單向閥還是直角型單向閥，都不允許閥芯錐面向上安裝。
七、電磁換向閥和電液換向閥
1.結(jié)構(gòu)和工作原理
WE型電磁換向閥采用濕式交流或直流電磁鐵。該閥是通過(guò)電磁鐵控制閥芯的不同工作位置。當(dāng)電磁鐵斷電時(shí)，閥芯靠彈簧壓力保持在中間或終端位置(脈沖式閥除外)。電磁鐵通電，閥芯被推到工作位置上，斷電后又恢復(fù)到初始狀態(tài)。這時(shí)用手推動(dòng)故障檢查按鈕可使閥芯移動(dòng)。
由于濕式電磁鐵內(nèi)部與回油腔相通，這樣銜鐵油里移動(dòng)，可以減少磨損、緩沖，并且提高了散熱性能，提高了使用壽命。交流電磁鐵具有動(dòng)作時(shí)間短，電氣控制線(xiàn)路簡(jiǎn)單，不需特殊的觸頭保護(hù)等特點(diǎn)。直流電磁鐵是切換特性軟，動(dòng)作頻率高，對(duì)過(guò)載或低電壓反應(yīng)不敏感，工作可靠。
WE型換向閥是由電磁鐵控制的滑閥式換向閥，它主要用于控制液體的通斷和流動(dòng)方向。
其結(jié)構(gòu)主要是由閥體、電磁鐵、滑閥以及復(fù)位彈簧等組成。在不通電的情況下被復(fù)位彈簧保持在中間位置或初始位置上(脈沖閥除外)。電磁鐵的推力通過(guò)推桿作用在滑閥上，并且把它從靜止位置推到工作位置上(終端位置)，由此改變了液流的方向P→A和B→T或者P→B和A→T。當(dāng)電磁鐵斷電后，滑閥被復(fù)位彈簧重新推到原來(lái)的靜止位置上。在電磁鐵斷電時(shí)，用故障檢查按鈕推動(dòng)滑閥移動(dòng)。
WEH型換向閥
WEH型換向閥是由電磁閥作為先導(dǎo)控制的滑閥工換向閥。用于控制液流的通斷和流動(dòng)方向。
換向閥是由主閥體、主閥芯、-個(gè)或二個(gè)復(fù)位彈簧和帶一個(gè)或二個(gè)電磁鐵的先導(dǎo)閥組成。主閥芯借助于彈簧力或液壓力保持中間位置。先導(dǎo)閥可選擇濕式直流(或交流)電磁鐵，用先導(dǎo)閥的控制油使主閥芯換向(移位)。
當(dāng)電磁鐵不通電時(shí)，推動(dòng)故障檢查按鈕可導(dǎo)閥芯移動(dòng)。控制油的輸入與輸出可選用內(nèi)控或外控。
彈簧對(duì)中的三位四通換向閥( 4WEH25,, 60/,型)
主閥芯是靠?jī)蓚�(gè)彈簧保持在中間位置，兩彈簧腔與導(dǎo)閥T腔相通(無(wú)背壓)。控制油從通道引入供給先導(dǎo)閥，當(dāng)先導(dǎo)閥換向后控制油作用在主閥芯兩端中的一端上，推動(dòng)主閥芯換向，從而使各油口按滑閥機(jī)能接通。當(dāng)電磁鐵斷電時(shí)，導(dǎo)閥芯回到初始位置(脈沖閥除外)，控制油腔
通過(guò)導(dǎo)閥T腔與油箱接通，在彈簧力的作用下，主閥芯回到中間位置。彈簧內(nèi)的控制油經(jīng)先導(dǎo)閥T腔或外排口Y排出。
壓力對(duì)中的三位四通換向閥(4WEH25H,,60/,型)
在這種結(jié)構(gòu)中是通過(guò)壓力油作用在主閥芯的兩端面上，由閥體內(nèi)的定位套使主閥芯保持在中間位置上。
如果主閥芯一端卸荷，則主閥換向，使相應(yīng)的油口接通;此卸荷端的控制油通過(guò)先導(dǎo)閥通過(guò)通道Y排出。
二位四通換向閥有4種不同的結(jié)構(gòu)
1.4WEH,, /,型:先導(dǎo)閥和主閥中各有一個(gè)復(fù)位彈簧(當(dāng)電磁鐵斷電時(shí)，
使主閥芯固定在初始位置上)
2.4WEH，H/,, /,型:先導(dǎo)閥有一個(gè)復(fù)位彈簧，由它來(lái)控制導(dǎo)閥芯保持在初始位置上。
3.4WEH,, H，/0.,型: 先導(dǎo)閥有兩個(gè)電磁鐵。在先導(dǎo)閥和主閥里都沒(méi)有復(fù)位彈簧，在這種情況下分別由電磁鐵和壓力油的同時(shí)作用下使主閥芯換向。因此就總有一個(gè)電磁鐵處于工作狀態(tài)。
4.4WEH, H/,, /0F,型:先導(dǎo)閥有兩個(gè)電磁鐵，可使閥芯停在某個(gè)工作位置上(脈沖式閥)。
主閥上沒(méi)有定位器，是在壓力油作用下移到相應(yīng)的工作位置。
在上述結(jié)構(gòu)中，主閥芯只有在控制油作用下才能正常動(dòng)作。
型號(hào)H.4WEH25,, 60/,, 6A,:在這種結(jié)構(gòu)里控制油是外供外排型的。控制沒(méi)從外排口X引入，并通過(guò)外排Y排出。
力士樂(lè)插裝式單向閥M-SR8KE05-1X/ R900346083
力士樂(lè)REXROTH插裝式單向閥M-SR 6...30
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力士樂(lè)REXROTH止回閥安裝裝置M-SR 52...150
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力士樂(lè)REXROTH疊加式液控單向閥Z2S 6
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力士樂(lè)REXROTH疊加式液控單向閥Z2S 10
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力士樂(lè)疊加式液壓鎖單向閥Z2S 16
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力士樂(lè)疊加式液壓鎖單向閥Z2S 22
R900433032 Z2S22A1-5X/
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力士樂(lè)REXROTH單向閥，先導(dǎo)式Z2S 32
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插裝閥與我們所說(shuō)的普通液壓控制閥有所不同，它的通流量可達(dá)到1000L/min,通徑可達(dá)200～250mm。閥芯結(jié)構(gòu)簡(jiǎn)單，動(dòng)作靈敏，密封性好。它的功能比較單一，主要實(shí)現(xiàn)液路的通或斷，與普通液壓控制閥組合使用時(shí)，才能實(shí)現(xiàn)對(duì)系統(tǒng)油液方向、壓力和流量的控制。
插裝閥基本組件
組件由閥芯、閥套、彈簧和密封圈組成。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。同一通徑的三種組件安裝尺寸相同，但閥芯的結(jié)構(gòu)形式和閥套座直徑不同。三種組件均有兩個(gè)主油口A 和B、一個(gè)控制口x 。
插裝閥和其閥孔的設(shè)計(jì)通用性的重要性在于大批量生產(chǎn)。就某一種規(guī)格的插裝閥為例，為了批量生產(chǎn)，其閥口的尺寸是統(tǒng)一的。此外，不同功能的閥可采用同一規(guī)格閥腔，例如：?jiǎn)蜗蜷y、錐閥、流量調(diào)節(jié)閥、節(jié)流閥、兩位電磁閥等等。如果同一規(guī)格、不同功能的閥無(wú)法采用不同閥體，那么閥塊的加工成本勢(shì)必增加，插裝閥的優(yōu)勢(shì)就不復(fù)存在。
插裝閥在流體控制功能的領(lǐng)域的使用種類(lèi)比較廣泛，已應(yīng)用的元件有是電磁換向閥，單向閥，溢流閥，減壓閥，流量控制閥和順序閥。通用性在流體動(dòng)力回路設(shè)計(jì)和機(jī)械實(shí)用性的延伸，充分展示了插裝閥對(duì)系統(tǒng)設(shè)計(jì)者和應(yīng)用者的重要性。由于其裝配過(guò)程的通用性、閥孔規(guī)格的通用性、互換性的特點(diǎn)，使用插裝閥完全可以實(shí)現(xiàn)完善的設(shè)計(jì)配置，也使插裝閥廣泛地應(yīng)用于各種液壓機(jī)械。
體積小、成本低
批量生產(chǎn)的對(duì)用戶(hù)益處在閥塊還未裝配線(xiàn)終點(diǎn)時(shí)就已顯現(xiàn)。采用插裝閥設(shè)計(jì)的整套控制系統(tǒng)可為用戶(hù)大大減少制造工時(shí)；該控制系統(tǒng)的每個(gè)元件在組裝成集成閥塊前就可進(jìn)行獨(dú)立測(cè)試；集成塊在發(fā)給用戶(hù)之前就可進(jìn)行整體測(cè)試。
由于必須安裝的元件和連接的管路大大減少，為用戶(hù)節(jié)省大量的制造工時(shí)。由于系統(tǒng)污染物的減少，泄漏點(diǎn)的減少和裝配錯(cuò)誤的降低，使可靠性顯著提高。插裝閥的應(yīng)用實(shí)現(xiàn)了系統(tǒng)的高效、方便。
以輪式裝載機(jī)為例，采用插裝閥集成塊來(lái)代替故障不斷、難以診斷和維修的動(dòng)力傳動(dòng)控制裝置。原有控制系統(tǒng)有60多個(gè)連接管件和19個(gè)獨(dú)立元件。用來(lái)替代的整體特制集成塊上只有11個(gè)管件和17個(gè)元件。體積為12 x 4 x 5立方英寸，是原系統(tǒng)所占空間的20%。采用插裝閥的特點(diǎn)如下：
減少安裝時(shí)間 減少泄漏點(diǎn) 減少易污染源 減少維修時(shí)間（因?yàn)椴逖b閥無(wú)需取下管接頭配件即可更換）
功能全、應(yīng)用廣泛
插裝閥已經(jīng)廣泛應(yīng)用于多種工程機(jī)械、物料搬運(yùn)機(jī)械和農(nóng)業(yè)機(jī)械。在常被忽視的工業(yè)領(lǐng)域中，插裝閥的應(yīng)用在不斷的擴(kuò)大。特別是在許多重量和空間的限制的場(chǎng)合中，傳統(tǒng)工業(yè)液壓閥束手無(wú)策，而插裝閥卻大顯身手。在某些應(yīng)用場(chǎng)合，插裝閥是提高生產(chǎn)力和競(jìng)爭(zhēng)力的選擇
新型插裝閥的功能正不斷被開(kāi)發(fā)出來(lái)。這些新開(kāi)發(fā)成果將保證將來(lái)可持續(xù)的生產(chǎn)效益。過(guò)去的經(jīng)驗(yàn)證明：想象力的貧乏是采用插裝閥實(shí)現(xiàn)生產(chǎn)既期效益的限制。
插裝閥單元的工作狀態(tài) 記油口A、B、x的壓力分別為pA、pB、px， 作用面積分別為AA、AB、Ax， 閥芯上端復(fù)位彈簧力為Ft ， 當(dāng) pxAx + Ft >pAAA + pBAB 時(shí) 閥口關(guān)閉 ； 當(dāng) pxAx + Ft ≤ pAAA+ pBAB 時(shí) 閥口開(kāi)啟。
實(shí)際工作時(shí)，閥芯的受力狀況是通過(guò)油口x的通油方式控制的。
X通回油箱，閥口開(kāi)啟；
x與進(jìn)油口相通，閥口關(guān)閉。
改變油口通油方式的閥稱(chēng)為先導(dǎo)閥。
插裝閥的應(yīng)用
三通閥 由兩個(gè)方向閥組件并聯(lián)而成，對(duì)外形成一個(gè)壓力油口、一個(gè)工作油口和一個(gè)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(gè)三通閥并聯(lián)而成
先導(dǎo)閥可以是一個(gè)三位四通換向閥
先導(dǎo)閥也可以是兩個(gè)二位四通換向閥或四個(gè)二位三通換向閥
四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)。
單向節(jié)流閥的結(jié)構(gòu)原理。該閥是管式聯(lián)接的單向節(jié)流閥，其節(jié)流口采用軸向三角槽式結(jié)構(gòu)。旋轉(zhuǎn)調(diào)節(jié)螺母，可改變節(jié)流口通流面積的大小，以調(diào)節(jié)流量。正向流動(dòng)時(shí)起節(jié)流閥作用；反向流動(dòng)時(shí)起單向閥作用，這時(shí)由于有部分油液可在環(huán)形縫隙中流動(dòng)，可以清除節(jié)流口上的沉積物。在閥體2左端有刻度槽，調(diào)節(jié)螺母3上有刻度，用以標(biāo)志調(diào)節(jié)流量的大小。
