Four different levels of analytical schematics of pump and motor models exist, arbitrarily numbered as Type 0 through Type 3, each one progressively more complex and more inclusive. Type 0 Models are ideal because they contain no losses. They are perfectly efficient, having 100% volumetric, mechanical, and overall efficiencies. They are referred to in industrial jargon as models for calculating the “theoretical” performance of pumps and motors. More-practical models include the
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