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nature : pump and pipeline transportation system consisting of a loss of energy. The loss of pump liquid from the pump flow to the friction that swirl and flow arising from the changes. According to physical process can be divided into : a stable flow of losses (including the impeller flow relative to the losses, pump body movement absolute loss), non-steady flow of hydraulic brake loss and loss. According to the pump impeller is the site of the hydraulic flow and the loss of hydraulic components losses. The loss of hydraulic calculation there were still difficulties, which generally determined experimentally.
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