| 摘要 |
<p>PURPOSE:To enhance the accuracy of dropping charge amount of liquefied gas, by providing a small type dropping tank having communicating pipes communicated with the upper space and bottom of a liquefied gas tank. CONSTITUTION:A small type dropping tank 13 is provided below the bottom of a reservoir tank 1, having a communicating pipe 14 communicated with the bottom of the reservoir tank 1 and a communicating pipe 15 communicating between the upper space of the dropping tank 13 and the upper space of the reservoir tank 1. A needle 17 opens a valve 16 for a predetermined time period by operation of a solenoid valve 18 to drop liquefied gas into a can 19. A stepping motor 20 limits the stroke of the needle 17 to regulate the opening degree of the valve 16 for controlling the dropping amount of the liquefied gas. The liquid level of the liquefied gas in the reservoir tank 1 and the internal pressure of the upper space thereof are stably maintained by a float valve 2 and a pressure control valve. Since this internal pressure is exerted to the dropping valve 16 through the communication pipes 14, 15, the dripping tank 13 which is even a small type, stably holds a dropping pressure. Further, the dropping tank 13 may be arranged in the vicinity of a winding and fastening section.</p> |
