Which type of sprinkler system uses a deluge-type valve, but has closed sprinklers?

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Multiple Choice

Which type of sprinkler system uses a deluge-type valve, but has closed sprinklers?

Two-stage water release is being tested here. In a preaction system, a deluge-type valve is used to release water into the piping only after an initiating event (such as a detector). The piping is kept dry, and the sprinklers themselves stay closed until a sprinkler head is heated and actuates. So you have water present in the system only after the detection event, but individual sprinklers do not discharge until their heads are activated. That combination—deluge-type valve with sprinklers remaining closed—fits a preaction system perfectly. Wet-pipe has water-filled pipes with immediate release at a heated head, dry-pipe involves air-filled piping that fills with water after the valve but still prepares heads to release, and special extinguishing systems aren’t described by this two-stage, interlocked behavior.

Two-stage water release is being tested here. In a preaction system, a deluge-type valve is used to release water into the piping only after an initiating event (such as a detector). The piping is kept dry, and the sprinklers themselves stay closed until a sprinkler head is heated and actuates. So you have water present in the system only after the detection event, but individual sprinklers do not discharge until their heads are activated. That combination—deluge-type valve with sprinklers remaining closed—fits a preaction system perfectly. Wet-pipe has water-filled pipes with immediate release at a heated head, dry-pipe involves air-filled piping that fills with water after the valve but still prepares heads to release, and special extinguishing systems aren’t described by this two-stage, interlocked behavior.

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