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额定流量是指泵在额定转速和额定压力下工作时，实际输出的流量。泵的产品样本或铭牌上标出的流量为泵的额定流量。
如何理解“液压泵的压力升高会使流量减少”的说法？ 
液压泵的输出流量与泵的结构参数、转速和容积效率有关。当液压泵选定后，其结构参数也就确定了；再选定液压泵的转速，则液压泵的输出流量只随容积效率的?v的变化而变化。我们知道，构成液压泵工作容积的各相邻零件之间存在着间隙，不可避免地要产生泄漏，使容积效率?v降低。又因为液压泵的输出压力决定于外负载，外负载越大，则输出压力越高，使液压泵的泄漏越大，降低容积效率，从而减少了液压泵的流量。可见“液压泵的压力升高会使流量减少”的说法是正确的。它是指当液压泵的压力升高后，由于加剧泄漏，从而降低容积效率，所以使泵的流量减少。