1、可输出较高负荷的压力和流量；2、可达到低压压力范围；3、可输出较高负荷的压力和流量往复泵中的活塞为圆柱形，可以改变其高度和位置，从而能把液体从进油口输送到出油口.而柱塞泵只能在气缸内作往复运动并且被活塞所带动.这就要求要有较高的效率和容积效率。

4、柱塞泵可输送含有大量颗粒含量较大、振动比较大、易结垢、易生锈和污染管道等物料.而往复泵则不能6、受结构和转速限制；7、回油泵具有可调性 往复泵与柱塞泵相比容积密封更可靠，效率更高密封装置的类型有：无压与抽吸式；带压与抽吸过程式。

高压密封采用可交换的油封，其密封面必须有一个相对较大的工作间隙以防磨损；而对于具有一定的静压及压力值变化周期范围的低压油封，采用可交换油封，可以提高密封件利用率由于液体在其流道中所产生的旋转运动在空气中发生变化而产生压力损失，因此高压油封需通过密封装置产生轴向往复运动以减小泵缸内介质在流量变化过程中所引起的惯性力。

往复式泵中，由压气机吸入口与进口形成真空段、由出口形成压缩段、泵室处于同一平面内而相互连通当液体经压气机吸入，泵室内压力增加至额定工作压力后，由于活塞处于回转角状态时与液体间相互作用产生的径向力和水平力造成液体在容积区域内迅速移动，并随之产生巨大地向周围液体压力损失。

当压力增加到额定工作压力后，压气缸所承受的压缩作用随之减弱并在泵腔内形成真空段且同时由于空气与液体相互对流交换能量导致泵腔中的液位上升而与液体表面形成一个真空层 90R130-HF-5-BC-80-L-3-C8-H-03-GBA-23-23-24 90R130HF5BC80L3C8H03GBA232324 90-R-130-HF-5-BC-80-L-3-C8-H-03-GBA-23-23-24 90R130HF5BC80L3C8H03GBA232324 90R130-HF-5-BC-80-L-4-C8-H-00-GBA-32-32-24 90R130HF5BC80L4C8H00GBA323224 90-R-130-HF-5-BC-80-L-4-C8-H-00-GBA-32-32-24 90R130HF5BC80L4C8H00GBA323224 90R130-HF-5-BC-80-L-4-C8-H-03-GBA-35-35-24 90R130HF5BC80L4C8H03GBA353524 90-R-130-HF-5-BC-80-L-4-C8-H-03-GBA-35-35-24 90R130HF5BC80L4C8H03GBA353524 90R130-HF-5-BC-80-P-4-C8-F-03-GBA-26-26-24 90R130HF5BC80P4C8F03GBA262624 90-R-130-HF-5-BC-80-P-4-C8-F-03-GBA-26-26-24 90R130HF5BC80P4C8F03GBA262624 90R130-HF-5-BC-80-R-3-F1-F-03-GBA-35-35-24 90R130HF5BC80R3F1F03GBA353524 90-R-130-HF-5-BC-80-R-3-F1-F-03-GBA-35-35-24 90R130HF5BC80R3F1F03GBA353524 90R130-HF-5-BC-80-R-3-F1-H-06-GBA-35-35-24 90R130HF5BC80R3F1H06GBA353524 90-R-130-HF-5-BC-80-R-3-F1-H-06-GBA-35-35-24 90R130HF5BC80R3F1H06GBA353524 90R130-HF-5-BC-80-R-4-F1-F-03-GBA-35-35-24 90R130HF5BC80R4F1F03GBA353524 90-R-130-HF-5-BC-80-R-4-F1-F-03-GBA-35-35-24 90R130HF5BC80R4F1F03GBA353524 90R130-HF-5-BC-80-R-4-F1-H-04-GBA-35-35-24 90R130HF5BC80R4F1H04GBA353524 90-R-130-HF-5-BC-80-R-4-F1-H-04-GBA-35-35-24 90R130HF5BC80R4F1H04GBA353524 90R130-HF-5-BC-80-S-3-C8-H-03-GBA-42-42-24 90R130HF5BC80S3C8H03GBA424224 90-R-130-HF-5-BC-80-S-3-C8-H-03-GBA-42-42-24 90R130HF5BC80S3C8H03GBA424224 90-R-130-HF-5-BC-80-S-4-F1-F-03-GBA-17-17-20 90R130HF5BC80S4F1F03GBA171720 90R130-HF-5-BC-80-S-4-F1-F-03-GBA-35-35-24 90R130HF5BC80S4F1F03GBA353524 90-R-130-HF-5-BC-80-S-4-F1-F-03-GBA-35-35-24 90R130HF5BC80S4F1F03GBA353524 90R130-HF-5-BC-80-S-4-F1-H-03-GBA-30-30-24 90R130HF5BC80S4F1H03GBA303024 90-R-130-HF-5-BC-80-S-4-F1-H-03-GBA-30-30-24 90R130HF5BC80S4F1H03GBA303024 90R130-HF-5-CD-80-L-3-C8-H-02-GBA-42-42-24 90R130HF5CD80L3C8H02GBA424224 90-R-130-HF-5-CD-80-L-3-C8-H-02-GBA-42-42-24 90R130HF5CD80L3C8H02GBA424224 90R130-HF-5-CD-80-L-4-C8-F-03-GBA-35-35-24 90R130HF5CD80L4C8F03GBA353524 90-R-130-HF-5-CD-80-L-4-C8-F-03-GBA-35-35-24 90R130HF5CD80L4C8F03GBA353524 90R130-HF-5-CD-80-L-4-F1-H-03-GBA-23-23-24 90R130HF5CD80L4F1H03GBA232324 90-R-130-HF-5-CD-80-L-4-F1-H-03-GBA-23-23-24 90R130HF5CD80L4F1H03GBA232324。