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穩(wěn)壓作用：溢流閥串聯(lián)在回油路上,，溢流閥產(chǎn)生背壓,，運動部件平穩(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,，當電磁鐵通電時,，溢流閥的遙控口通油箱，此時液壓泵卸荷,。溢流閥此時作為卸荷閥使用,。
安全保護作用：系統(tǒng)正常工作時，閥門關(guān)閉,。只有負載超過規(guī)定的極限（系統(tǒng)壓力超過調(diào)定壓力）時開啟溢流,，進行過載保護，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)**gao工作壓力高10%～20%）,。
實際應用中一般有：作卸荷閥用,，作遠程調(diào)壓閥，作高低壓多級控制閥,，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,、直動型溢流閥 ,。2、先導式溢流閥,。
對溢流閥的主要要求：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,，一般是由先導式溢流閥加上一個2位2通電磁閥組成。
2）這個電磁閥實際上由兩部分組成：2位2通的液壓閥部分,，加上一個電磁鐵,。2位2通閥是開通，還是關(guān)閉,，是由電磁鐵推動閥芯運動來實現(xiàn)的,。像樓上朋友講的，有的閥電磁鐵通電時打開,，有的閥電磁鐵斷電時打開,，蘿目青菜個人各愛（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溢流閥的某個部位相連,，另一頭通過油管與油箱相連,。通過操作電磁鐵可以讓先導溢流閥的某個部位或者與油箱相通，或者不與油箱相通,。
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