威格士VICKERS液压泵的种类：
1、按流量是否可调节可分为：威格士变量泵和威格士定量泵。输出流量可以根据需要来调节的称为威格士变量泵 ，流量不能调节的称为威格士定量泵。
2、按液压系统中常用的泵结构分为：威格士齿轮泵、威格士叶片泵和威格士柱塞泵3种。
威格士VICKERS齿轮泵：体积较小，结构较简单，对油的清洁度要求不严，价格较便宜；但威格士齿轮泵轴受不平衡力， 磨损严重，泄漏较大。
威格士叶片泵：分为威格士双作用叶片泵和威格士单作用叶片泵。威格士叶片泵流量均匀、运转平稳、噪音小、 作压力和容积效率比vickers齿轮泵高、结构比齿轮泵复杂。
威格士VICKERS柱塞泵：容积效率高、泄漏小、可在高压下工作、大多用於大功率液压系统；但威格士柱塞泵结构复杂， 材料和加工精度要求高、价格贵、对油的清洁度要求高。
一般在vickers齿轮泵和威格士叶片泵不能满足要求时才用柱塞泵。还有一些其他形式的vickers液压泵，如 vickers螺杆泵等，但应用不如上述3种普遍。
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威格士VICKERS柱塞泵是往复泵的一种，属于体积泵，其柱塞靠泵轴的偏心转动驱动，往复运动，其吸入和排出阀都是单向阀。当柱塞外拉时，工作室内压力降低，出口阀关闭，低于进口压力时，进口阀打开，液体进入；柱塞内推时，工作室压力升高，进口阀关闭，高于出口压力时，出口阀打开，液体排出。带滑靴结构的轴向柱塞泵是目前使用zui广泛的轴向柱塞泵，安放在缸体中的柱塞通过滑靴与斜盘相接触，当传动轴带动缸体旋转时，斜盘将柱塞从缸体中拉出或推回，完成吸排油过程。柱塞与缸孔组成的工作容腔中的油液通过配油盘分别与泵的吸、排油腔相通。变量机构用来改变斜盘的倾角，通过调节斜盘的倾角可改变泵的排量。