| 摘要 |
PURPOSE:To quickly perform cutoff of gas required from various caused by converting operation signals of a gas alarm, a seismic intensity meter, an overheat detector, a telephone sound and a manually-operated switch to pulse signals, thereby to drive a solenoid and block up a gas cock. CONSTITUTION:A gas pipeline cutoff device includes a gas leakage detecting signal terminal 1, a seismic intensity detecting signal terminal 2, a check signal terminal 3, an overheat signal terminal 4 and a telephone audible signal terminal 5, wherein output signals given to the respective terminals 1-5 are applied to OR circuit 6a of a gate pulse generating circuit 6 through a photo coupler 13. A control thyristor 8 is conducted by a gate pulse generated through the OR circuit 6a, and a solenoid built in a cutoff device 7 is excited by electric power of a power supply circuit 8 or a charging cell 11 to block up a gas cock. At this time, an alarm lamp 10 is lighted to indicate cutoff operation of the cutoff device 7. |
