| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive pump device driven only by compressed air and requiring no maintenance even for air entrainment. SOLUTION: This pump device is equipped with a tank 5, a water absorption pipe 7 connected to the tank 5, a check valve 9 arranged in this water absorption pipe 7, a throttle valve 6 whose one end is connected to a compressed air source 10 and other end is connected to the tank 5, a discharge pipe 8 connected to the lower part of the tank 5, a check valve 9a arranged in the discharge pipe 8 and an ejector 1 having a vacuum producing opening 2 connected to the upper part of the tank 5, an exhaust opening 3 connected to a side downstream from the check valve 9a in the discharge pipe 8 and an air supply opening 4 connected to the compressed air source 10.
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