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防止系統(tǒng)超負荷。雖然液壓系統(tǒng)有安全閥起過載保護作用，但是超負荷工作時，安全閥經常處于卸載工作狀態(tài)，易使油溫升高，產生不良后果；若安全閥作用失靈，則將破壞系統(tǒng)。為保障系統(tǒng)安全，應盡量防止系統(tǒng)工作于超負荷狀態(tài)。