To prevent levering of suction capability of a pump in a vacuum type dreaeration apparatus.
A throttle valve 14 is connected to a liquid tank 11 containing a liquid, and a closed type gas-liquid separation tank 16 for separately storing a liquid and a gas is connected to the throttle valve 14. A suction port 23b of a liquid circulation pump 23 is connected to the liquid storage part 16a of the gas-liquid separation tank 16 and at the same time a delivery port 23b of the liquid circulation pump 23 is connected to the liquid tank 11. Since the suction vacuum pressure of the liquid circulation pump 23 works on the throttle valve 14 through the closed type gas-liquid separation tank 16, the bubbles of a dissolved gas which is deaerated from the liquid between the throttle valve 14 and the gas-liquid separation tank 16 come in the gas-liquid separation tank 16 and are separated and released to a negative pressure space 16b in the upper side relative to the liquid storage part 16a in the lower side and do not reach the liquid circulation pump 23.
TSURUOKA KENJI
HASHIMOTO YUKIO
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