Reliable DDX Single Interlock Preaction System Instructions

The Reliable DDX Single Interlock Preaction System is designed for water sensitive areas that require protection from inadvertent water flow into the sprinkler system piping. There are three configurations of this system: Wet Pilot Line, Dry Pilot Line and Electric Actuation. It is a hydraulically operated, straight-through-design, differential latching clapper-type valve that can be reset externally without removing its cover plate.

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Reliable DDX Single Interlock Preaction System Instructions | Manualzz

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Key features

  • Externally resettable clapper
  • One main drain
  • Wet Pilot Line
  • Dry Pilot Line
  • Electric Actuation
  • UL Listed
  • FM Approved
  • cULus Certified

Frequently asked questions

The Reliable DDX Single Interlock Preaction System comes in three configurations: Wet Pilot Line, Dry Pilot Line, and Electric Actuation.

The benefits of using a Single Interlock Preaction System over a wet pipe or deluge system include: a fire alarm sounds prior to the operation of a sprinkler head, a trouble annunciator signals whenever the integrity of the piping or sprinklers is accidentally or intentionally disturbed, and speedy detection and an early fire alarm are provided by fire detectors.

The Wet Pilot Line configuration uses closed sprinklers or pilot line detectors that are more sensitive to heat than the sprinkler heads in the fire sprinkler system. The Dry Pilot Line configuration uses an air-pressurized line of closed sprinklers or pilot line detectors that are located in the area to be protected. The Electric Actuation configuration uses an electrical detector to activate the solenoid valve, which then releases water into the sprinkler system piping.

To reset the Model DDX Deluge Valve, simply push in and turn the reset knob at the rear of the valve.
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