| 摘要 |
A pump apparatus includes a pump having a suction port and a discharge port for discharging the fluid sucked from the suction port, a return passage connecting the discharge port with the suction port for returning a portion of the fluid discharged from the discharge port into the suction port, a return flow control valve disposed in the return passage for controlling an amount of the portion of the fluid returned to the suction port through the return passage and an expanded chamber formed in the return passage and located between the suction port and the return flow control valve. The expanded chamber has a sectional area larger than that of the return passage.
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