This system is another type of dry-pipe sprinkler system, in which water flow from the pipe system through the pre-action alarm valve is initiated only by the activation of an automatic detection system. Water does not flow into the pipe system until the sprinkler is activated.
The single-interlock pre-action sprinkler system is suitable for use in areas where water discharge due to an accident would cause serious damage. The activation method is determined based on the detection system option suitable for use in the area. The activation can be either pneumatic or electric.