PURPOSE: To achieve an immediate spraying of water from sprinkler heads when a fire occurs and moreover, a stoppage of the spraying from the sprinkler heads when the fire is subsided though this extinguishing equipment is of a preoperation type which is adapted to keep water from spraying from sprinkler heads even when the sprinkler heads work violently encountering an external impact.

CONSTITUTION: A branch pipe 3 having sprinkler head S1... mounted thereon and a main 2 connected to the branch pipe 3 are always filled with water. The branch pipe 3 has a valve seat 7 inside and a valve body 8 having a vertically moving device 9 is set on the valve seat 7. The vertically moving device 9 is operated by a signal of a fire sensor H1 having the plurality of the sprinkler heads S1... as territory.