容积式泵是依靠工作元件在泵缸内作往复或回转运动，使工作容积交替地增大和缩小，以实现液体的吸入和排出。工作元件作往复运动的容积式泵称为往复泵，作回转运动的称为回转泵。前者的吸入和排出过程在同一泵缸内交替进行，并由吸入阀和排出阀加以控制；后者则是通过齿轮、螺杆、叶形转子或滑片等工作元件的旋转作用，迫使液体从吸入侧转移到排出侧。

容积式泵在一定转速或往复次数下的流量是一定的，几乎不随压力而改变；往复泵的流量和压力有较大脉动，需要采取相应的消减脉动措施；回转泵一般无脉动或只有小的脉动；具有自吸能力，泵启动后即能抽除管路中的空气吸入液体；启动泵时必须将排出管路阀门*打开；往复泵适用于高压力和小流量；回转泵适用于中小流量和较高压力；往复泵适宜输送清洁的液体或气液混合物。总的来说，容积泵的效率高于动力式泵。MAYR 8242242 NAGEL:9907484
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