| 摘要 |
An earthquake actuated automatic gas shutoff valve having a valve bottom portion with a generally horizontal floor having a ball seat and a valve seat surrounding a gas outlet passageway. A ball having an elastomeric outer surface is held in the ball seat and in the event of an earthquake, the ball is shaken out of the ball seat and rolls into the valve seat to stop the flow of gas. The ball can either be a solid elastomeric ball or a metal ball with an elastomeric outer coating.
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