容積式泵是依靠工作元件在泵缸內作往復或回轉運動，使工作容積交替地增大和縮小，以實現液體的吸入和排出。工作元件作往復運動的容積式泵稱為往復泵，作回轉運動的稱為回轉泵。前者的吸入和排出過程在同一泵缸內交替進行，并由吸入閥和排出閥加以控制；后者則是通過齒輪、螺桿、葉形轉子或滑片等工作元件的旋轉作用，迫使液體從吸入側轉移到排出側。

容積式泵在一定轉速或往復次數下的流量是一定的，幾乎不隨壓力而改變；往復泵的流量和壓力有較大脈動，需要采取相應的消減脈動措施；回轉泵一般無脈動或只有小的脈動；具有自吸能力，泵啟動后即能抽除管路中的空氣吸入液體；啟動泵時必須將排出管路閥門*打開；往復泵適用于高壓力和小流量；回轉泵適用于中小流量和較高壓力；往復泵適宜輸送清潔的液體或氣液混合物。總的來說，容積泵的效率高于動力式泵。MAYR 8242242 NAGEL:9907484
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