from the Fig. I guess... m& k$ S- S# E8 k7 n+ l1 n8 C & a1 `8 K# P1 m! C& d$ e1 r a
variable displacement and fixed displacement pumps + M6 g# m# ]: h' _' ?" ?- O9 A R' d. h. B
you can change the swash of one pump to vary the displacement and then change the flow6 e+ ^3 E: m) n$ l: I2 H' o
B L# M" n: u6 y* C+ _' Zactually the first Fig tells you the relationship of Load pressure and flow . ! B- J# w: M r7 G/ x3 D$ Z
based on it . you can determine the horsepower loss and suitable operating pressure. " z8 M% g, k7 D) g% T9 r9 w9 ~$ n. y7 ~% }3 r% r- H6 D. y
I guess all above.. not 100% sure