FIELD: pimping fluid. SUBSTANCE: three baffles of the column define two spaces. The bottom space is in communication with the pipe line for pumping fluid out. The pipe line is provided with a valve. The top space is in communication with the pipe line for supplying compressed gas. The check valve is mounted in the bottom baffle. The middle baffle is provided with the seat having through opening and valve. The weight of the valve is less than the weight of the fluid in the valve space. The valve is made up as a hollow ball. The center of gravity of the ball is shifted with respect to the geometric center. EFFECT: enhanced efficiency. 2 cl, 2 dwg
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