简要说明：D120-50*7,8SA-7B---------参数、价格、图片、图纸、

D120-50*7,8SA-7B---------参数、价格、图片、图纸、 D120-50*7多级离心泵,8SA-7B中开泵,有好礼回馈,心动不如行动！

什么叫汽蚀余量？什么叫吸程？各自计量单位表示字母？
泵在工作时液体在叶轮的进口处因一定真空压力下会产生汽体，汽化的气泡在液体质点的撞击运动下，对叶轮等金属表面产生剥蚀，从而破坏叶轮等金属，此时真空压力叫汽化压力，汽蚀余量是指在泵吸入口处单位重量液体所具有的超过汽化压力的富余能量。单位用米标注，用（npsh）r。吸程即为必需汽蚀余量δh：即泵允许吸液体的真空度，亦即泵允许的安装高度，单位用米。吸程=标准大气压（10.33米）-汽蚀余量-安全量（0.5米）

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