Abstract: A liquid container includes a hollow body containing an outlet hole formed in the bottom portion thereof, a V-shaped control valve mounted on the bottom portion of the body and having a first tube received in the body and a second tube extending outward from the body via the outlet hole, a plurality of drain holes contained in the mediate portion of the control valve and connecting between the body and the second tube, a control gasket movably mounted in the control valve and movable between a first position where the control gasket seals each of the drain holes, thereby closing the connection between the body and the second tube, and a second position where the control gasket is released from the drain holes, thereby opening the connection between the body and the second tube, and a drive device for moving the control gasket between the first position and the second position.