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液壓傳動中由液壓元件（液壓油泵）、液壓控制元件（各種液壓閥）、液壓執(zhí)行元件（液壓缸和液壓馬達(dá)等）、液壓輔件（管道和蓄能器等）和液壓油組成的液壓系統(tǒng)。

液壓泵把機(jī)械能轉(zhuǎn)換成液體的壓力能，液壓控制閥和液壓輔件控制液壓介質(zhì)的壓力、流量和流動方向，將液壓泵輸出的壓力能傳給執(zhí)行元件，執(zhí)行元件將液體壓力能轉(zhuǎn)換為機(jī)械能，以完成要求的動作