Dry automatic sprinkler system (Figure 5-2) consists of pipeline system, closed sprinkler head, dry alarm valve, water flow indicator, alarm device, inflation equipment, exhaust equipment and water supply equipment, etc. composition.

Figure 5-2 Dry automatic sprinkler system

1—Water supply pipe; 2—Gate valve; 3—Dry alarm valve; 4—Pressure gauge; 5, 6— Stop valve; 7—filter; 8, 14—pressure switch; 9—hydraulic alarm; 10—air compressor; 11—check valve; 12—pressure gauge; 13—safety valve; 15—fire alarm control box; 16—Flow indicator; 17—Closed sprinkler head; 18—Fire detector

Dry sprinkler system has no water in the pipeline after the alarm valve, so it is not afraid of high ambient temperature or freezing, so It is suitable for buildings and places where the ambient temperature is lower than 4℃ or higher than 70℃.

Compared with the wet sprinkler system, the dry sprinkler system adds a set of inflatable equipment. The air pressure in the pipe network must always be maintained within a certain range, so the management is more complicated and the investment is More. The gas in the pipe needs to be discharged before spraying water, and the fire extinguishing speed is not as fast as the wet automatic sprinkler system.