| 摘要 |
PROBLEM TO BE SOLVED: To prevent leakage of fire extinguishing liquid due to the corrosion of a contact surface between a thin valve seat material and the end of water passage hole by using the corrosion resistant material for the inside of a piping. SOLUTION: A fire extinguishing closed sprinkler head has a thin valve seal material 31 fitted to a valve element 30 as a closing means for the valve element 30, a seat part 15 formed in the peripheral edge of the end of the water passage hole, and the thin seal material is made to bite with the seat part to close the valve element. A water-repellent material or the corrosion resistant grease can be filled in a groove between the seat part and the seat part formed in the periphery of the water lead hole end surface.
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