柱塞泵：由于柱塞泵压力高，结构紧凑，效率高，流量调节方便，故在需要高压、大流量、
大功率的系统中和流量需要调节的场合，如龙门刨床、拉床、液压机、工程机械、矿山
冶金机械、船舶上得到广泛的应用
优点:结构紧凑，径向尺寸小，容积效率高
缺点:结构复杂，价格较贵
工作压力:高压
美国威格士VICKERS柱塞泵
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