產(chǎn)品詳情
溢流閥串聯(lián)在回油路上,溢流閥產(chǎn)生背壓,運(yùn)動(dòng)部件平穩(wěn)性增加。
系統(tǒng)卸荷作用:在溢流閥的遙控口串接溢小流量的電磁閥,當(dāng)電磁鐵通電時(shí),溢流閥的遙控口通油箱,此時(shí)液壓泵卸荷。溢流閥此時(shí)作為卸荷閥使用。
安全保護(hù)作用:系統(tǒng)正常工作時(shí),閥門關(guān)閉。只有負(fù)載超過規(guī)定的極限(系統(tǒng)壓力超過調(diào)定壓力)時(shí)開啟溢流,進(jìn)行過載保護(hù),使系統(tǒng)壓力不再增加(通常使溢流閥的調(diào)定壓力比系統(tǒng)最gao工作壓力高10%~20%)。
實(shí)際應(yīng)用中一般有:作卸荷閥用,作遠(yuǎn)程調(diào)壓閥,作高低壓多級(jí)控制閥,作順序閥,用于產(chǎn)生背壓(串在回油路上)。
溢流閥一般有兩種結(jié)構(gòu):1、直動(dòng)型溢流閥 。2、先導(dǎo)式溢流閥。
對(duì)溢流閥的主要要求:調(diào)壓范圍大,調(diào)壓偏差小,壓力振擺小,動(dòng)作靈敏,過載能力大,噪聲小。
1)電磁溢流閥原理上,一般是由先導(dǎo)式溢流閥加上一個(gè)2位2通電磁閥組成。
2)這個(gè)電磁閥實(shí)際上由兩部分組成:2位2通的液壓閥部分,加上一個(gè)電磁鐵。2位2通閥是開通,還是關(guān)閉,是由電磁鐵推動(dòng)閥芯運(yùn)動(dòng)來實(shí)現(xiàn)的。像樓上朋友講的,有的閥電磁鐵通電時(shí)打開,有的閥電磁鐵斷電時(shí)打開,蘿目青菜個(gè)人各愛(根據(jù)系統(tǒng)要求選擇)。也就是說,電磁閥這里有一條通路一頭與先導(dǎo)溢流閥的某個(gè)部位相連,另一頭通過油管與油箱相連。通過操作電磁鐵可以讓先導(dǎo)溢流閥的某個(gè)部位或者與油箱相通,或者不與油箱相通。
3)先導(dǎo)溢流閥的主閥上腔壓力,是由先導(dǎo)閥加于控制的。如果先導(dǎo)閥正常工作,即主閥上腔有先導(dǎo)閥規(guī)定的壓力,則整個(gè)溢流閥就會(huì)在系統(tǒng)壓力到達(dá)調(diào)定壓力時(shí)其主閥口打開一定的開度,一方面能將系統(tǒng)多余流量流回油箱,另一方面又能維持系統(tǒng)的壓力為先導(dǎo)閥的調(diào)定值。可見,先導(dǎo)閥主要管壓力,主閥服從先導(dǎo)閥的領(lǐng)導(dǎo),在先導(dǎo)閥動(dòng)作時(shí)將主閥口開到合適大小,正好將多余流量流出去,又不影響系統(tǒng)壓力。
4)如果先導(dǎo)閥不調(diào)什么壓力,也就是說主閥上腔沒有先導(dǎo)閥控制的壓力,這樣主閥芯就解放了,由于沒有來自上腔調(diào)壓力,閥口就開到最da,油源來的油不再進(jìn)入系統(tǒng)而以盡可能低的卸荷壓力流回油箱。
5)可見定差溢流閥中的電磁閥,僅僅在系統(tǒng)卸荷時(shí)(液壓閥部分)流過1-2升/分的先導(dǎo)流量,而浩浩蕩蕩的主流量還是通過主閥口流回油箱。
湖北賀德克插裝式溢流閥DB12120A-01X-350
WSMO8130C-01-C-N-24DG
WSM08130D-01-C-N-24DG
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RV10120-01X-0.5
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湖北賀德克插裝式溢流閥DB12120A-01X-350
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DVP-12-01.X
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