| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of noise due to cavitation when oil temperature is low. SOLUTION: This device is provided with a fixed displacement pump P in a casing C and a suction passage sucking working fluid from a reservoir R provided outside of the casing via piping Rp and leading the same to the fixed displacement pump, a choke 21 provided in a delivery side of the fixed delivery pump, a flow control valve F controlling distribution of supply flow rate to an actuator A and flow rate re-circulated to the fixed displacement pump according to pressure difference between before and after the choke 21, and a re-circulation passage 11 leading re-circulated flow rate to the suction passage. COPYRIGHT: (C)2006,JPO&NCIPI
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