美国VICKERS，威格士叶片泵
威格士叶片泵转子旋转时，叶片在离心力和压力油的作用下，尖部紧贴在定子内表面上。这样两个叶片与转子和定子内表面所构成的工作容积，先由小到大吸油后再由大到小排油，叶片旋转一周时，完成两次吸油与排油。
威格士叶片泵单作用的工作原理：泵由转子1、定子2、叶片3、配油盘和端盖等部件所组成。定子的内表面是圆柱形孔。转子和定子之间存在着偏心。叶片在转子的槽内可灵活滑动，在转子转动时的离心力以及通入叶片根部压力油的作用下，叶片顶部贴紧在定子内表面上，于是两相邻叶片、配油盘、定子和转子间便形成了一个个密封的工作腔。当转子按逆时针方向旋转时，图右侧的叶片向外伸出，密封工作腔容积逐渐增大，产生真空，于是通过吸油口6和配油盘5上窗口将油吸入。而在图的左侧。叶片往里缩进，密封腔的容积逐渐缩小，密封腔中的油液经配油盘另一窗口和压油口1被压出而输出到系统中去。这种泵在转子转一转过程中，吸油压油各一次，故称单作用泵。转子受到径向液压不平衡作用力，故又称非平衡式泵，其轴承负载较大。改变定子和转子间的偏心量，便可改变泵的排量，故这种泵都是变量泵。
美国VICKERS，威格士叶片泵双作用的工作原理：它的作用原理和单作用叶片泵相似，不同之处只在于定子表面是由两段长半径圆弧、两段短半径圆弧和四段过渡曲线八个部分组成，且定子和转子是同心的。在图示转子顺时针方向旋转的情况下，密封工作腔的容积在左上角和右下角处逐渐增大，为吸油区，在左下角和右上角处逐渐减小，为压油区；吸油区和压油区之间有一段封油区把它们隔开。这种泵的转子每转一转，每个密封工作腔完成吸油和压油动作各两次，所以称为双作用叶片泵。泵的两个吸油区和两个压油区是径向对称的，作用在转子上的液压力径向平衡，所以又称为平衡式叶片泵。
美国VICKERS，威格士叶片泵型号选择参考：
2525V系列双联泵
2525V10A10A1C22R,2525V12A10A1C22R,2525V14A10A1C22R,2525V17A10A1C22R,2525V21A10A1C22R,2525V10A12A1C22R,2525V12A12A1C22R,2525V14A12A1C22R,2525V17A12A1C22R,
2525V21A12A1C22R,2525V10A14A1C22R,2525V12A14A1C22R,2525V14A14A1C22R,2525V17A14A1C22R,2525V21A14A1C22R,2525V10A17A1C22R,2525V12A17A1C22R,2525V14A17A1C22R,2525V17A17A1C22R,2525V21A17A1C22R,2525V10A21A1C22R,2525V12A21A1C22R
2525V14A21A1C22R,2525V17A21A1C22R,2525V21A21A1C22R
3520V系列双联泵
3520V25A5A1C22R,3520V30A5A1C22R,3520V35A5A1C22R,3520V38A5A1C22R,3520V25A8A1C22R,3520V30A8A1C22R,3520V35A8A1C22R,3520V38A8A1C22R,3520V35A10A1C22R,3520V38A10A1C22R,3520V25A11A1C22R,3520V30A11A1C22R,3520V35A11A1C22R,3520V38A11A1C22R,3520V25A12A1C22R,3520V30A12A1C22R,3520V35A12A1C22R,3520V38A12A1C22R,3520V25A14A1C22R,3520V30A14A1C22R,3520V35A14A1C22R,3520V38A14A1C22R
3525V系列双联泵
3525V25A10A1C22R,3525V30A10A1C22R，3525V35A10A1C22R，3525V38A10A1C22R，3525V25A12A1C22R，3525V30A12A1C22R，3525V35A12A1C22R，3525V38A12A1C22R，3525V25A14A1C22R，3525V30A14A1C22R，3525V35A14A1C22R，3525V38A14A1C22R，3525V25A17A1C22R，3525V30A17A1C22R，3525V35A17A1C22R，3525V38A17A1C22R，3525V25A21A1C22R，3525V30A21A1C22R，3525V35A21A1C22R，3525V38A21A1C22R
4520V系列双联泵
4520V42A5A1C22R，4520V45A5A1C22R，4520V50A5A1C22R，4520V60A5A1C22R，4520V42A8A1C22R，4520V60A8A1C22R，4520V42A9A1C22R，4520V45A9A1C22R，4520V50A9A1C22R，4520V60A9A1C22R，4520V42A11A1C22R，4520V45A11A1C22R，4520V50A11A1C22R，4520V60A11A1C22R，4520V42A12A1C22R，4520V45A12A1C22R，4520V50A12A1C22R，4520V60A12A1C22R，4520V42A14A1C22R，4520V45A14A1C22R
4520V50A14A1C22R，4520V60A14A1C22R
4525V系列双联泵
4525V42A10A1C22R，4525V45A10A1C22R，4525V50A10A1C22R，4525V60A10A1C22R，4525V42A12A1C22R，4525V45A12A1C22R，4525V50A12A1C22R，4525V60A12A1C22R，4525V42A14A1C22R，4525V45A14A1C22R，4525V50A14A1C22R，4525V60A14A1C22R，4525V50A17A1C22R，4525V60A17A1C22R，4525V42A21A1C22R4525V45A21A1C22R4525V50A21A1C22R4525V60A21A1C22R
4535V系列双联泵
4535V42A25A1C22R，4535V45A25A1C22R，4535V50A25A1C22R，4535V60A25A1C22R，4535V42A30A1C22R，4535V45A30A1C22R，4535V50A30A1C22R，4535V60A30A1C22R，4535V42A35A1C22R,4535V45A35A1C22R,4535V50A35A1C22R，4535V60A35A1C22R，4535V42A38A1C22R，4535V45A38A1C22R，4535V50A38A1C22R，4535V60A38A1C22R。 |
