Dual Interlock Type

A valve group that holds water at the entrance of the line in a pre-action sprinkler system; water can only be supplied when both an alarm signal arrives from the fire detection system and a sprinkler head opens, reducing the air pressure in the pipe. Since the line does not receive water in a single condition, the risk of unwanted discharge due to pipe damage is reduced. It is used in volumes with freezing risk, data centers, and archives.