| 摘要 |
PROBLEM TO BE SOLVED: To prevent dead water from occurring in a sprinkler head by completely blocking inflow of water to the head body in usual status, in a closed-type sprinkler head for residence connected with an opening of a branch of a T-shaped joint attached to a midstream of a water-supply pipe branching from water line. SOLUTION: In usual status, the dead water is prevented from occurring in the head body by enclosing a water inlet of the head body by a second valve. Under fire, the second valve comes down from the water inlet to open the water inlet, while a first valve comes down by decomposition of a thermosensitive decomposition part to open the water inlet. COPYRIGHT: (C)2007,JPO&INPIT
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