To improve workability during installation by eliminating any jobs such as iron pipe cutting, screw threading, insertion of screwed-in seals, and the like, and furthermore to reduce labor costs as well as to be free from a fear of freezing by eliminating a process of filling water.

The interval between a deluge valve 1 and a thermosensitive operation part 5 as well as that between the operation parts 5, are linked with a wire 4. The operation part 5 reacts to a fire heat to release linking of one end of the wire 4 or both opposite ends of the wire 4, which lets the deluge valve 1 open.