2.起安全保護(hù)作用
避免液壓系統(tǒng)和機床因過載而引起事故。在這種場合下，閥門平時是關(guān)閉的，只有負(fù)載超過規(guī)定的極限時才開啟，起安全保護(hù)作用。通常，把溢流閥的調(diào)定壓力比系統(tǒng)最高工作壓力調(diào)高10~20%
3.作卸荷閥用
由先導(dǎo)溢流閥與二位二通電磁閥配合使用，可使系統(tǒng)卸荷
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