| 摘要 |
PURPOSE:To continuously supply liquefied gas to a filling line where a liquefied gas cylinder can not be carried-in, by providing a pressure control means and a liquid level detector to the upper and lower chambers of a heat insulating liquefied gas container and controlling an opening and closing valve and a valve mechanism on the basis of a liquid level signal. CONSTITUTION:A solenoid valve 33 is operated by the detection signal of the first liquid level detector 44 and the liquid level of the liquid nitrogen in an upper chamber 31a is held within a set range and, when pressure is judged to be high by an upper chamber pressure detector 46, a solenoid valve 47 is opened and, when said pressure is low, a solenoid valve 48 and a self-supporting type pressure control valve 49 are opened. A solenoid valve 52 is controlled by the second liquid level detector 51 in a lower chamber 31b to hold a liquid level within a set range. When pressure is judged to be high by a lower chamber pressure detector 54, a solenoid valve 56 or a pressure control valve 55 is operated so as to be opened and, when said pressure is low, a pressure control valve 57 for pressurization is opened to introduce the nitrogen gas of the outside. A definite amount of the nitrogen gas is always introduced under pressure from the pressure control valve 57 and pressure variation or the reduction and change in the pressure of the lower chamber 31b at the time of lowering in a liquid level is corrected to keep the pressure in the lower chamber 31b constant.
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