容積式泵是通過一個封閉的空間容積的變化來實現吸油和壓油的。當這個封閉容積由小變大時進行吸油，由大變小時進行壓油。典型的為力士樂柱塞泵，柱塞從缸孔中拉出時吸油，壓進時壓油。這種泵進口與出口是被隔開的，效率取決于隔開吸壓油腔的各對運動零件間的結構工藝間隙及油液的粘度等。粘度越高效率越高，輸油量幾乎保持不變
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