Emergency valve incorporating thermal foamable plastic material
OwnerToyoki Kurosawainventor
Life of this patent
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Abstract
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.
Claims3
An emergency shut-off valve for irreversibly stopping the flow of material in a conduit when an excessive temperature external to the valve is sensed by the valve, said valve comprising a valve casing defining a chamber which communicates with said conduit, and a thermally foamable heat-resistant plastic element residing in said chamber in an amount sufficient to irreversibly expand into said conduit and shut off the flow of material therein, said element in unexpanded condition allowing the flow of material through said conduit;
- and wherein said thermally foamable heat-resistant plastic element located in said chamber is packed in a stretchable membrane which comprises a shell-like expandable can of a material that will spring into an inflated condition closing off flow upon expansion of said plastic element.
Dependencies are inferred from the claim text.