["Lorsque la pompette à vide se démarre, la vanne de sortie est ouverte, pourquoi est-ce différent de d'une pompe centrifugee normalee ? La van pompt à vide ne doit-on pas interdire de fermer complètement la van van de sortie lors de son utilisation ?","Pourquoi la la van van de sortie de la pompette à vide ne doit-elle être complètement fermée ? La pompette à vide est-elle une pompe centrifunte, pourquoi ne peut-on pasfermer complètement la van de sortie ? Cela ne permettrait-il pas de ne pas créer un vide à l'entrée et d'évacuer les liquide d'entrée du compartiment de sortie ?","Lorsqu de la pompe centrifunte, on doit dababre la puis re ouvrir pour pour pour pour pour pour pour pour on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on 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自吸泵启动时，出口门是打开，为什么同普通离心泵相反？自吸泵使用时出口阀门禁止完全关闭？
离心泵出口时要先关闭再打开，为了防止启动电流过大。 感觉这条是不是真的必要，电机要转起来启动电流是成才工作下的好几倍，再加上带着液体输送这点电流也不增加多少。 实际我们的小泵正常操作情况下只是点开关按钮，阀门调节好都是不动的。 大的泵，出口管径大、阀门大、压力高的，还特意要求出口阀稍开，以免出口压力过高推动阀芯使阀门不易打开
为什么自吸泵的出口门禁止完全关闭？
谢谢，为什么自吸泵的出口门禁止完全关闭？自吸泵也是离心泵，这点想不明白，不能完全关闭出口门，是打不出水来入口建立不了真空，进入 入口的液体不能排挤出入口腔室内的空气吗？