| 摘要 |
PROBLEM TO BE SOLVED: To quickly respond to the pressure change and to save energy by providing a control valve for distributing flows from both feed passages to an overflow port between the two feed passages provided in a displacement type pump system and by providing a variable control orifice in its downstream side. SOLUTION: A displacement type pump 10 of roller system discharges fluid sucked from two inlets 12, 13 during the operation from two outlets 14, 15 to feed passages 16, 17. In this case, it is provided with a control valve 11 having a spool valve 22 being slidable in a bore 24 of the body and the spool valve 22 is provided with a first land part 29 arranged between a main discharge passage 18 and an annular overflow port 31, and a second land part 30 closing an annular bypass port 34 communicated with the second feed passage 17 in an upstream position of a check valve 19 formed therein. A pressure-sensitive orifice 40 which is formed of a piston 43 energized by a spring 45 is provided in a passage 41 detouring an orifice 20 provided in its halfway thereto in the discharge passage 18.
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