叶片泵：叶片泵主要用于中压、中速、精度要求较高的液压系统中。在机床液压系统中应用
广泛;在工程机械中，由于工作环境不清洁，应用较少。
优点:输油量均匀，压力脉动小，容积效率高
缺点:结构复杂，难以加工，叶片易被脏物卡死
美国威格士VICKERS柱塞泵
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