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力士樂溢流閥上海 Rexroth溢流閥在使用中有時會出現(xiàn)調(diào)壓失靈現(xiàn)象,。先導(dǎo)式溢流閥調(diào)壓失靈現(xiàn)象有二種情況:一種是調(diào)節(jié)調(diào)壓手輪建立不起壓力,,或壓力達不到額定數(shù)值;另一種調(diào)節(jié)手輪壓力不下降,,甚至不斷升壓,。R900971180 DBEP6C06-1X/45AG24NK4M-383
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Rexroth溢流閥出現(xiàn)調(diào)壓失靈,除閥芯因種種原因造成徑向卡緊外,,還有下列一些原因:
*是主閥體(2)阻尼器堵塞,,油壓傳遞不到主閥上腔和導(dǎo)閥前腔,導(dǎo)閥就失去對主閥壓力的調(diào)節(jié)作用,。因主閥上腔無油壓力,,彈簧力又很小,所以主閥變成了一個彈簧力很小的直動型溢流閥,,在進油腔壓力很低的情況下,,主閥就打開溢流,,系統(tǒng)就建立不起壓力,。
壓力達不到額定值的原因,是調(diào)壓彈簧變形或選用錯誤,,調(diào)壓彈簧壓縮行程不夠,,閥的內(nèi)泄漏過大,或?qū)чy部分錐閥過度磨損等,。
第二是阻尼器(3)堵塞,,油壓傳遞不到錐閥上,導(dǎo)閥就失去了支主閥壓力的調(diào)節(jié)作用,。阻尼器(小孔)堵塞后,,在任何壓力下錐閥都不會打開溢流油液,閥內(nèi)始終無油液流動,,主閥上下腔壓力一直相等,,由于主閥芯上端環(huán)形承壓面積大于下端環(huán)形承壓面積,,所以主閥也始終關(guān)閉,不會溢流,,主閥壓力隨負載增加而上升,。當執(zhí)行機構(gòu)停止工作時,系統(tǒng)壓力就會無限升高,。除這些原因以外,,尚需檢查外控口是否堵住,錐閥安裝是否良好等,。