Pre-Action Sprinkler Systems

Pre-action sprinkler systems are similar to dry systems and are used when the heat cannot be maintained above 4°C , or when the area being protected may have water sensitive items. This is typical for storage in freezers, computer server rooms, libraries or museums. A pre-action system is activated by a secondary device like a smoke or heat detector which sends a signal to a release panel, and the release panel will activate the pre-action valve. Once a sprinkler head activates air pressure is dropped and the valve opens, water is delivered into the piping system and then onto the fire and an alarm is activated. Sprinkler heads are activated by the heat in a fire and only the sprinkler heads that have enough heat to activate them go off.