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威格士VICKERS液壓泵的種類：
1、按流量是否可調節可分為：威格士變量泵和威格士定量泵。輸出流量可以根據需要來調節的稱為威格士變量泵 ，流量不能調節的稱為威格士定量泵。
2、按液壓系統中常用的泵結構分為：威格士齒輪泵、威格士葉片泵和威格士柱塞泵3種。
威格士VICKERS齒輪泵：體積較小，結構較簡單，對油的清潔度要求不嚴，價格較便宜；但威格士齒輪泵軸受不平衡力， 磨損嚴重，泄漏較大。
威格士葉片泵：分為威格士雙作用葉片泵和威格士單作用葉片泵。威格士葉片泵流量均勻、運轉平穩、噪音小、 作壓力和容積效率比vickers齒輪泵高、結構比齒輪泵復雜。
威格士VICKERS柱塞泵：容積效率高、泄漏小、可在高壓下工作、大多用於大功率液壓系統；但威格士柱塞泵結構復雜， 材料和加工精度要求高、價格貴、對油的清潔度要求高。
一般在vickers齒輪泵和威格士葉片泵不能滿足要求時才用柱塞泵。還有一些其他形式的vickers液壓泵，如 vickers螺桿泵等，但應用不如上述3種普遍。
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威格士VICKERS柱塞泵是往復泵的一種，屬于體積泵，其柱塞靠泵軸的偏心轉動驅動，往復運動，其吸入和排出閥都是單向閥。當柱塞外拉時，工作室內壓力降低，出口閥關閉，低于進口壓力時，進口閥打開，液體進入；柱塞內推時，工作室壓力升高，進口閥關閉，高于出口壓力時，出口閥打開，液體排出。帶滑靴結構的軸向柱塞泵是目前使用zui廣泛的軸向柱塞泵，安放在缸體中的柱塞通過滑靴與斜盤相接觸，當傳動軸帶動缸體旋轉時，斜盤將柱塞從缸體中拉出或推回，完成吸排油過程。柱塞與缸孔組成的工作容腔中的油液通過配油盤分別與泵的吸、排油腔相通。變量機構用來改變斜盤的傾角，通過調節斜盤的傾角可改變泵的排量。