| 摘要 |
A gas shut-off device comprising a housing having a gas inflow hole and a gas outflow hole, the housing including therein a first shut-off valve with permanent magnets for closing and opening the gas flow passage, a partition having an opening formed therein for allowing gas to flow little by little from the inflow side into the outflow side, a second shut-off valve with permanent magnets for shutting off the flow of gas through the opening in the partition; and a solenoid having a rotary element being rotatable in forward and reverse directions according to a signal from a gas detector and a signal from a reset service respectively, the rotary element having a first permanent magnet to attract or repel the permanent magnet of the first shut-off valve at each stop position of the rotary element and a second permanent magnet to attract or repel the permanent magnet of the second shut-off valve at each stop position of the rotary element.
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