Double Interlock Preaction Valve

The Double Interlock Preaction Valve provides the highest level of accidental discharge protection available in a sprinkler system — requiring two completely independent confirmation events before water enters the system piping. Both a fire detection device must activate AND a sprinkler head must open before the preaction valve releases water, virtually eliminating the possibility of accidental discharge from a single point of failure. Viking double interlock preaction valves are the system of choice for mission-critical environments including Tier III and Tier IV data centers, server rooms, archival storage facilities, and museums where any unintended water release would result in catastrophic and irreplaceable losses. Engineered to NFPA 13 standards with UL and FM approvals, they represent the gold standard in water-based fire protection for sensitive, high-value spaces.