| 摘要 |
A rupturable disc shaped capsule replaceably installed in a fire hose coupling, the capsule having a small central bore therethrough to permit the initial limited flow of water, there being one or more regions of the downstream end wall of the capsule which are rupturable by water pressure when the hose fills by virtue of air pockets disposed within the capsule causing the wall to collapse from external pressure there being water-erodible support structure within the capsule which disintegrates upon the rupturing of the capsule wall and entry of water causing the entire capsule assembly to be destroyed and finally blown out the end of the hose.
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