Abstract: A dry-type vacuum sprinkler system is provided, from which water remaining in a secondary pipe system can be easily removed and shortcomings typically seen in a dry-type sprinkler system are dissolved. The dry-type vacuum sprinkler system of the invention is secured from a quick fire extinguishment operation at the time of a fire. The sprinkler system of the invention includes a negative pressure state maintenance member for maintaining air charged in the secondary pipe system in a negative pressure state. The negative pressure state is defined as a normal state in the invention. The negative pressure state maintenance member includes a suction pipe 53 which extends to an upper position of the secondary pipe system 24, and communicates with the secondary pipe system 24, and a suction pump 51 provided on the suction pipe 53. The suction pump 51 suctions the air of the secondary pipe system 24 from the upper position of the secondary pipe system 24.

Abstract: The invention provides a wet-type sprinkler system by which the water damage caused when a sprinkler heads function in a wrong way with ensuring a quick extinguishing operation at the time of fire. A suction pipe is provided for the system so as to communicate with a top part of a secondary pipeline 24 of a feed pipe arrangement 20 forming a water supply line from a water supply unit 16 to sprinkler heads 12. Further, a suction unit (an electromagnetic valve 54 and a suction pump 50) for sucking the air in the secondary pipeline section 24 from the top part of the secondary pipeline section 24 is provided onto the suction pipe 52. The suction pipe 52, the suction pump 50 and the electromagnetic valve 54 constitute a negative-pressure-securing section. In the secondary pipeline 24, which is filled with water in a normal condition water is negatively pressurized by the suction operation of the suction unit. The negatively pressurized state of the water is ensured under a normal condition.