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柱塞泵是靠柱塞在缸體中作往復運動造成密封容積的變化來實現(xiàn)吸油與壓油的液壓泵，與齒輪泵和葉  片泵相比，這種泵有許多優(yōu)點。首先，構成密封容積的零件為圓柱形的柱塞和缸孔，加工方便，可得到較  高的配合精度，密封性能好，在高壓工作仍有較高的容積效率；第二，只需改變柱塞的工作行程就能改變  流量，易于實現(xiàn)變量；第三，柱塞泵中的主要零件均受壓應力作用，材料強度性能可得到充分利用。由于  柱塞泵壓力高，結構緊湊，效率高，流量調節(jié)方便，故在需要高壓、大流量、大功率的系統(tǒng)中和流量需要調節(jié)的場合，如龍門刨床、拉床、液壓機、工程機械、礦山冶金機械、船舶上得到廣泛的應用。柱塞泵按柱  塞的排列和運動方向不同，可分為徑向柱塞泵和軸向柱塞泵兩大類。

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