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操縱先導(dǎo)手柄，則液壓先導(dǎo)回路中建立起與手柄偏轉(zhuǎn)量成比例的壓力來控制換向閥閥芯的位移和泵的排量

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正流量控制系統(tǒng)，是力士樂上世紀(jì)80年代的技術(shù)，主要特點(diǎn)是：操縱手柄的先導(dǎo)壓力不僅控制換向閥，還用來調(diào)節(jié)油泵的排量。執(zhí)行元件不工作的時(shí)候，油泵上沒有先導(dǎo)壓力，斜盤擺角小，油泵只輸出少量的備用流量