| 摘要 |
PROBLEM TO BE SOLVED: To speed up gas supply by a manual return while ensuring safety and improve convenience in a gas meter which allows an automatic return and manual return of a shutoff valve. SOLUTION: The gas meter includes a return button for giving a return direction allowing the shutoff valve to return from a shutoff state to a valve-open state. A first pressure value and a second pressure value, which is different from the first pressure value, which are to be compared to a gas pressure, are set. Without the reception of the return direction from the return button, after a lapse of a waiting time from the shutoff of the shutoff valve or its shutoff direction, the shutoff valve is changed to the valve-open state from the shutoff state. After a lapse of a predetermined time from the opening of the shutoff valve, the shutoff valve is controlled to be the shutoff state. When a decrease value in the gas pressure is the first pressure value or below, the shutoff valve is controlled to be the valve-open state, the shutoff valve is changed to the valve-open state with the reception of the return direction from the return button, and after a lapse of a predetermined time, the shutoff valve is changed to the shutoff state. When the decrease value in the gas pressure is the second pressure value or below, the shutoff value is controlled to be the valve-open state. COPYRIGHT: (C)2011,JPO&INPIT
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