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In preaction applications, reliability is essential. A premature water response could be as disastrous as a fire. The FireLock NXT Series 769-P Preaction Check Valve has a simple design that eliminates the additional check valve found in other systems.
In a preaction system, the pipe lines are precharged with pressurized air. Water is held from the piping by an electrically actuated solenoid. The solenoid is activated by an alarm signal and water is distributed to the site after a sprinkler is heat-activated.
If an alarm system detects smoke, for example, the valve opens to fill system piping. If temperatures rise from an actual fire, the sprinkler bulb bursts to distribute water immediately. False alarms are minimized in a Preaction System by requiring two events to occur before the system is activated. Depending on setup, a sprinkler broken by accident will not trigger the system. The Series 769-P device is also easily drained and reset if the alarm is activated.
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