PURPOSE:To enable to inject the constant volume of active gas in a high speed continuously by a method wherein a control device for supplying the liquefied gas, which keeps the height of the level of the liquefied gas at a predetermined position, is utilized. CONSTITUTION:A valve opening and closing device 8 is operated to drop the constant volume of LN2 gas into a can body 18 from the staying chamber 4 of an injection equipment 1 through an injection nozzle 7. When the position of the level of the gas liquid in the staying chamber 4 descends during the continuous injection motion, a level control device 14 is operated, a pressure regulating valve 26 in a pressurized gas supplying pipeline 25, connecting an N2 gas reservoir 24 and an LN2 gas reservoir 2, is operated to supply the LN2 gas into the staying chamber 4 and the position of the level of the gas liquid is kept at the predetermined position. In this case, the flow of the LN2 gas in the staying chamber 4 is mitigated by a flow mitigating device 17 and, further, swinging of the LN2 gas is restricted by a swing restricting plate 15, thereby stabilizing the outflow of the gas from the injection nozzle 7.
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