from the Fig. I guess...1 \, M+ T+ H" g' c" g
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variable displacement and fixed displacement pumps6 c9 t& v" F' t9 z5 k* e- F4 u
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you can change the swash of one pump to vary the displacement and then change the flow. q# G; g$ u( J& _0 N. N
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actually the first Fig tells you the relationship of Load pressure and flow . ( w+ P. O' ^; C5 Q! {3 {2 R
based on it . you can determine the horsepower loss and suitable operating pressure., ~5 q$ V$ B, c* o
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I guess all above.. not 100% sure