| 摘要 |
1290861 Flame arrestor DUNLOP HOLDINGS Ltd 12 March 1970 [19 March 1969] 14406/69 Heading F4T A flame arrestor for allowing gas to pass while preventing the passage of a flame comprises a porous closure member 11 of reticulated foam material made substantially of metal. The flame arrestor is located in a pipe 13 by means of a tube 9. In other embodiments (not shown) the closure member is located adjacent an aperture or within a hollow nut. Location can be by means of bolts passing through a flanged ring surrounding the closure member or through sleeves in the closure member. The closure member may have compressed portions through which the bolts pass. The closure member may be made by spraying, dipping or electrodeposition of metal on a porous material, for example polyurethane foam which may then be removed by "ashing out".
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