| 摘要 |
<p>PROBLEM TO BE SOLVED: To certainly prevent erroneous water discharge by preventing that a valve element opens even if rapidly filling pressurized fire extinguishing water by a simplified and downsized structure.SOLUTION: A joint body 12 includes: a primary port 14; a secondary port 16; and a thermosensitive port 18 mounted with a thermosensitive decomposition part 28. The joint body 12 is formed with a valve hole 24 in a position coaxial with the thermosensitive port 18 of a partition 22. A disk member 44 is formed with a valve element part 46 inserted into the valve hole 24 and opening/closing a flow passage in one end, and is formed with an abutment part 50 abutting on a closed portion of the thermosensitive port 18 by the thermosensitive decomposition part 28 in the other end. A first lift amount L1 from an initial position needed for that the valve element part 46 opens the valve hole 24 is set to be larger than a second lift amount L2 from an initial position needed to abut on the closed portion of the thermosensitive port 18 of the abutment part 50 by water filling of pressurized fire extinguishing water on the primary port side and to perform a stop.</p> |
