| 摘要 |
This emergency valve comprises a thermal foamable plastics element or a valve operation gear with a built-in thermal foamable plastics element, which is functioned by thermal foaming and expansion of the built-in thermal foamable plastics, and if a fire broken out near the valve, the valve should be automatically and non-reversibly closed or opened by the valve operation gear which is functioned by thermal foamed plastics or thermal foamed plastics in itself.
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