The Viking SUREFIRE® Double Interlock Preaction TRIMPAC® Model D-2 and D-2B used with either a Model E or F Deluge Valve, a Viking Easy Riser Check Valve or VFR-500 Release Control Panel and all associated trim piping form a unique operating system. The system piping is normally dry and pnuematically pressurized to supervise the integrity of the piping, fitting and sprinklers and provide the failsafe operation of the system upon loss of the primary and secondary power supplies. Double Interlock Preaction systems are commony used in areas subject to freezing and to help minimize accidential water damage.

The Viking SUREFIRE® Double Interlock Preaction TRIMPAC® Model D-2 & D-2B is a factory assembled and tested unit. The enclosure incorporates access doors for the emergency release and alarm test valves and view ports for the prime and water supply pressure gauges. The TRIMPAC® Model D-2 and D-2B eliminates the field assembly of the deluge valve trim and release module piping. The enclosure protects the trim from damage or inadvertent operation. The included stainless steel hoses (or field provided piping) from the deluge valve to the enclosure assembly allows the TRIMPAC® Model D-2 & D-2B to be installed remote from the sprinkler system riser. A valve drain package is required for the deluge valve and is ordered based on the size of the deluge valve. 

Note: Viking SUREFIRE® Double Interlock Preaction TRIMPAC® D-2 & D-2B is a complete system, and is listed as a unit. As such, it is normally not possible to modify the components of the system or their interrelationship without comprising the listing.