Volumetric pump in a certain speed or the number of under reciprocating flow is certain, almost does not change with the stress; reciprocating pump flow and pressure have greater ripple and need to take the pulse of the corresponding mitigation measures;

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完全打开；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。

Rotary pump generally no pulsation or only small pulsating with self absorption capacity, pump start to pumping pipe of the air suction liquid; start the pump must be discharged pipe valve is fully open; reciprocating pump applicable to high pressure and small flow; rotary pump applicable to small flow and high pressure; reciprocating pump is suitable for conveying clean liquid or gas-liquid mixture. Generally speaking, the efficiency of the volume pump is higher than that of the power type pump.
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