Technical data

1.1.3 Model DDX Electrical Actuation Trim

Where electrical actuation of the system is preferred over wet or dry pilot lines, or where otherwise re-

quired by project specifications, a listed normally-closed (de-energized) solenoid valve is installed on

the outlet of the Model DDX Deluge Valve push-rod chamber. The solenoid provides a separation be-

tween the hydraulically pressurized push-rod chamber and atmospheric pressure drain tubing. Upon

receipt of a signal from the electric detection system, the release panel opens (energizes) the solenoid

valve. Pressure is released from the push-rod chamber allowing the Model DDX Deluge Valve to open

and deliver water to the open sprinklers, nozzles, or other discharge devices in the protected area.

Alarm devices are activated upon the flow of water into the sprinkler system piping.

Approvals and technical data for Model DDX electrical actuation deluge systems can be found on Reli-

able Automatic Sprinkler Company Bulletins 516 through 519.

Figure 4