| 摘要 |
PURPOSE:To provide a system which enable to detect a very small amount of gas leakage by detecting the quantity of pressure drop per unit time by comparing the remaining gas pressure at a certain time and the remaining gas pressure after elasping a fixed time. CONSTITUTION:While the solenoid valve is energized during a valve 7 is opened for combusting, allowing to continue the gas feeding. An abnormal signal is produced, the solenoid valve 8 being not energized, and the leakage of the fuel gas is prevented, when no combustion is continued by turning off of the flame or opening the valve 7 without lighting and elasping the preset time. Besides, when the valves 7 are completely closed after completing gas use, the solenoid valve 8 is closed, the remaining gas pressure in the pipe downstream from the solenoid valve 8 is monitored by the gas pressure detector 9, the leakage of the gas is detected when the change of the remaining gas pressure exceeds the fixed value per unit time, the solenoid valve power source circuit 21 is locked electrically and sends the warning signals by the alarm circuit 23. |
