R900956101力士樂(lè)比例減壓閥
價(jià)格
6500 元/件
- 最小起訂量: 1件
- 所在地:湖北 武漢
- 供貨總量: 100件
- 發(fā)布時(shí)間:2024-12-26
黃依依 :15307130607
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價(jià)格
6500 元/件
黃依依 :15307130607
(聯(lián)系我時(shí)請(qǐng)告訴我是"鋁道網(wǎng)"看到的信息,會(huì)有優(yōu)惠哦!謝謝。
3DREP6C-20=25EG24N9K4M=00 R900956101力士樂(lè)比例減壓閥
武漢百士自動(dòng)化設(shè)備有限公司專注于液壓、氣動(dòng)、工控自動(dòng)化備件銷售,熱誠(chéng)歡迎新老客戶咨詢購(gòu)買(mǎi)!
減壓閥的作用原理是靠閥內(nèi)流道對(duì)水流的局部阻力降低水壓,水壓降的范圍由連接閥瓣的薄膜或活塞兩側(cè)的進(jìn)出口水壓差自動(dòng)調(diào)節(jié)。定比減壓原理是利用閥體中浮動(dòng)活塞的水壓比控制,進(jìn)出口端減壓比與進(jìn)出口側(cè)活塞面積比成反比。這種減壓閥工作平穩(wěn)無(wú)振動(dòng);閥體內(nèi)無(wú)彈簧,故無(wú)彈簧銹蝕、金屬疲勞失效之慮;密封性能良好不滲漏,因而既減動(dòng)壓(水流動(dòng)時(shí))又減靜壓(流量為0時(shí));特別是在減壓的同時(shí)不影響水流量。
水流通過(guò)減壓閥雖有很大的水頭損失,但由于減少了水的浪費(fèi)并使系統(tǒng)流量分布合理、改善了系統(tǒng)布局與工況,因此總體上講仍是節(jié)能的。介質(zhì)為蒸汽的場(chǎng)合,宜選用先導(dǎo)活塞式減壓閥或先導(dǎo)波紋管式減壓閥。為了操作、調(diào)整和維修的方便,減壓閥一般應(yīng)安裝在水平管道上。
(1)出口壓力幾乎等于進(jìn)口壓力,不減壓
這一故障現(xiàn)象表現(xiàn)為:減壓閥進(jìn)出口壓力接近相等,而且出口壓力不隨調(diào)壓手柄的旋轉(zhuǎn)調(diào)節(jié)而變化。產(chǎn)生原因和排除方法如下。
①因主閥芯上或閥體孔沉割槽棱邊上有毛刺或者主閥芯與閥體孔之間的間隙里卡有污物,或者因主閥芯或閥孔形位公差超差,產(chǎn)生液壓卡緊,將主閥芯卡死在較大開(kāi)度(max)的位置上,由于開(kāi)口大,油液不減壓。此時(shí)可根據(jù)上述情況分別采取去毛刺、清洗和修復(fù)閥孔和閥芯精度的方法予以排除。
②因主閥芯與閥孔配合過(guò)緊,或裝配時(shí)拉毛閥孔或閥芯,將閥芯卡死在較大開(kāi)度位置上,此時(shí)可選配合理的間隙。J型減壓閥配合間隙一般為0. 007~0. 015mm,配前可適當(dāng)研磨閥孔,再配閥芯。
③主閥芯短阻尼孔或閥座孔堵塞,失去了自動(dòng)調(diào)節(jié)機(jī)能,主閥彈簧力將主閥推往較大開(kāi)度,變成直通無(wú)阻,進(jìn)口壓力等于出口壓力?捎φ1. Omm鋼絲或用壓縮空氣吹通阻尼孔,并進(jìn)行清洗再裝配。
④對(duì)J型減壓閥,帶阻尼孔的阻尼件是壓入主閥芯內(nèi)的,使用中有可能因過(guò)盈量不夠而沖出。沖出后,使進(jìn)油腔與出油腔壓力相等(無(wú)阻尼),而閥芯上下受力面積相等,但出油腔有一彈簧,所以主閥芯總是處于較大開(kāi)度的位置,使出口壓力等于入口壓力。此時(shí)需重新加工外徑稍大的阻尼件并重新壓入主閥芯。
⑤JF型減壓閥,出廠時(shí)泄油孑L是用油塞堵住的。當(dāng)此油塞未擰出而使用時(shí),使主閥芯上腔(彈簧腔)困油,導(dǎo)致主閥芯處于較大開(kāi)度而不減壓。J型管式閥與此相同。J型板式閥如果設(shè)計(jì)安裝板時(shí)未使L口連通油池也會(huì)出現(xiàn)此現(xiàn)象。
⑥對(duì)J型管式閥,拆修時(shí)很容易將閥蓋裝錯(cuò)方向(錯(cuò)90°或180°),使外泄油口堵死,無(wú)法排油,造成同上的困油現(xiàn)象,使主閥頂在較大開(kāi)度而不減壓。修理時(shí)將閥蓋裝配方向裝對(duì)即可。
⑦對(duì)JF型減壓閥,頂蓋方向裝錯(cuò)時(shí),會(huì)使輸出油孔與泄油孔相通,造成不減壓,也須注意。
(2)出口壓力很低,即使擰緊調(diào)壓手輪,壓力也升不起來(lái)
①減壓閥進(jìn)出油口接反了:對(duì)板式閥為安裝板設(shè)計(jì)有錯(cuò),對(duì)管式閥是接管錯(cuò)誤。J型減壓閥的進(jìn)出油口跟Y型溢流閥的進(jìn)出油口剛好相反。用戶使用時(shí)請(qǐng)注意閥上油口附近所打的鋼印標(biāo)記(Pl、P2、L等字樣),或查閱液壓元件產(chǎn)品目錄,不可設(shè)計(jì)錯(cuò)和接錯(cuò)。
②進(jìn)油口壓力太低,經(jīng)減壓閥芯節(jié)流口后,從出油口輸出的壓力更低,此時(shí)應(yīng)查明進(jìn)油口壓力低的原因(例如溢流閥故障)。
③減壓閥下游回路負(fù)載太小.壓力建立不起來(lái),此時(shí)可考慮在減壓閥下游串接節(jié)流閥來(lái)解決。
④先導(dǎo)閥(錐閥)與閥座配合面之間因污物滯留而接觸不良,不密合;或先導(dǎo)錐閥有嚴(yán)重劃傷,閥座配合孑L失圓,有缺口,造成先導(dǎo)閥芯與閥座孔不密合。
⑤拆修時(shí),漏裝錐閥或錐閥未安裝在閥座孔內(nèi)。對(duì)此,可檢查錐閥的裝配情況或密合情況。
⑥主閥芯上長(zhǎng)阻尼孔被污物堵塞,如圖3-21所示,P2腔的油液不能經(jīng)長(zhǎng)阻尼孔e流入主閥彈簧腔,出油腔P2的反饋壓力傳遞不到先導(dǎo)錐閥上,使導(dǎo)閥失去了對(duì)主閥出口壓力的調(diào)節(jié)作用。阻尼孔堵塞后,主閥P。腔失去了油壓p3的作用,使主閥變成一個(gè)彈簧力很弱(只有主閥平衡彈簧)的直動(dòng)式滑閥,故在出油口壓力很低時(shí),便可克服平衡彈簧的作用力而使減壓閥節(jié)流口關(guān)小ymin,這樣進(jìn)油口壓力p1經(jīng)ymin節(jié)流口大幅度降壓至p2,使出油口壓力上不來(lái)。應(yīng)使長(zhǎng)阻尼孔通暢。
⑦先導(dǎo)閥彈簧(調(diào)壓彈簧)錯(cuò)裝成軟彈簧,或者因彈簧疲勞產(chǎn)生較好變形或者折斷等原因,造成p2壓力調(diào)不高,只能調(diào)到某一低的定值,此值遠(yuǎn)低于減壓閥的較大調(diào)節(jié)壓力。
⑧調(diào)壓手柄因螺紋拉傷或有效高層度不夠,不能擰到底而使得壓力不能調(diào)到較大。
⑨閥蓋與閥體之間的密封不良,嚴(yán)重漏油。產(chǎn)生原因可能是O形圈漏裝或損傷,壓緊螺釘未擰緊以及閥蓋加工時(shí)出現(xiàn)端面平面度誤差,一般是四周凸,中間凹。
⑩主閥芯因污物、毛刺等卡死在小開(kāi)度的位置上,使出口壓力低?蛇M(jìn)行清洗與去毛刺。
(3)不穩(wěn)壓,壓力振擺大,有時(shí)噪聲大
根據(jù)相關(guān)標(biāo)準(zhǔn)的規(guī)定,J型減壓閥壓力振擺為±o.lMPa,JF型為±o.3MPa,超過(guò)此標(biāo)準(zhǔn)為壓力振擺大,不穩(wěn)壓。
①J型與JF型減壓閥為先導(dǎo)式,先導(dǎo)閥與溢流閥通用,所以產(chǎn)生壓力振擺大的原因和排除方法可參照溢流閥的有關(guān)部分進(jìn)行。
②減壓閥在超過(guò)額定流量下使用時(shí),往往會(huì)出現(xiàn)主閥振蕩現(xiàn)象,使減壓閥不穩(wěn)壓,此時(shí)出油口壓力出現(xiàn)“升壓一降壓一再升壓一再降壓”的循環(huán),所以一定要選用適合型號(hào)規(guī)格的減壓閥。
③泄油口L受的背壓大,也會(huì)產(chǎn)生壓力振擺大和不穩(wěn)壓的現(xiàn)象,泄油管宜單獨(dú)回油。
④彈簧變形或剛度不好(熱處理不好),導(dǎo)致壓力波動(dòng)大,可更換合格的彈簧。
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