2 Series 769 FireLock NXT™ Preaction Valve
30.82
SYSTEM DESCRIPTION
Non-Interlocked
Non-interlocked systems are designed so that either an event detection by the release mechanism or loss
of supervisory air in the sprinkler system will cause the valve to operate. When the valve operates, water
will enter the sprinkler system and flow from any open sprinklers or other openings in the system.
Pneumatic Release:
The pneumatic release system uses a supervisory pilot line to detect a release event.
When EITHER a pilot sprinkler or a system sprinkler operates, the water in the diaphragm chamber is
released and the valve operates. If the pilot sprinkler activates and a system sprinkler does not operate,
water will fill the sprinkler system, alarms will be activated and the Victaulic Series 769 Actuated Valve will
act as an Alarm Check Valve. If the valve is actuated by the activation or damage of a sprinkler, water will
enter the system and flow from any open sprinklers. Alarms will activate due to water entering the
intermediate chamber of the valve.
Pneumatic/Electric Release:
The Victaulic Electric Release System uses an electric solenoid valve,
approved electric panel and a compatible detection system. When EITHER an electric detection or a
system sprinkler operates, the water in the diaphragm chamber is released and the valve operates. If
there is an electric detection and a system sprinkler does not operate, water will fill the sprinkler system,
alarms will be activated and the Victaulic Series 769 Actuated Valve will act as an Alarm Check Valve. If
the valve is actuated by the activation or damage of a sprinkler system sprinkler, water will enter the
system and flow from any open sprinklers. Alarms will activate due to water entering the intermediate
chamber of the valve.
Single Interlocked
Single interlocked systems are designed so that only an event detection by the release mechanism will
cause the valve to operate. When the valve operates water will enter the sprinkler system and flow from
any open sprinklers or other openings in the system.
Pneumatic Release:
The pneumatic release system uses a supervisory pilot line to detect a release event.
Only when a pilot sprinkler operates will the water in the diaphragm chamber be released and the valve
operate. Pneumatic pressure is maintained in the sprinkler system only for supervisory purposes and a
low pressure alarm is installed in the sprinkler system in order to detect any leaks in the system. If the pilot
sprinkler activates and a system sprinkler does not operate, water will fill the sprinkler system, alarms will
be activated and the Victaulic Series 769 Actuated Valve will act as an Alarm Check Valve. If a system
sprinkler is damaged or activates and there is no release mechanism detection the low pressure alarm in
the system will activate but no water will flow until there is a release detection.
Electric Release:
The Victaulic Electric Release System uses an electric solenoid valve, approved electric
panel and a compatible detection system. Only when a release system event occurs, will the water in the
diaphragm chamber be released and the valve operate. Pneumatic pressure is maintained in the
sprinkler system only for supervisory purposes and a low pressure alarm is installed in the sprinkler
system in order to detect any leaks in the system. If there is an electric release activation and a sprinkler
system sprinkler does not operate, the valve will operate and water will fill the sprinkler system, alarms will
be activated and the Victaulic Series 769 Actuated Valve will act as an Alarm Check Valve. If a system
sprinkler is damaged or activates and there is no release mechanism detection, the low pressure alarm
in the system will activate but the valve will not operate and no water will flow until there is a release
detection.
Double Interlocked
Double interlocked systems are designed so that the valve will actuate only in the event of multiple fire
detections by the release mechanisms. If a single release event occurs alarms will sound but the valve
will not operate and water will not flow until a second release event is detected. Double interlocked
systems are commonly used in refrigerated systems and in systems where water entering the sprinkler
system is critical as well as when accidental discharge of water is critical.
Pneumatic/Electric Release:
The electric/pneumatic preaction system uses both an electric release
system, (composed of an approved solenoid valve, electric panel and an appropriate sensor), and
pneumatically pressurized sprinkler system. The Victaulic Series 769 Actuated Valve will activate ONLY
when there is a pressure loss in the sprinkler system AND the electric detection of a release event. In the
event of a loss of pressure in the sprinkler system without an electric detection the valve will not actuate
until a second release event is detected. In this way if there is accidental damage to the sprinkler system
no water will flow. Additionally, if there is an electric detection and no pressure loss in the sprinkler system
the valve will not actuate. Alarms will activate in both cases alerting the user of a detection condition.
Electric (Electric-Pneumatic/Electric):
The electric/pneumatic/electric release uses two electric detection
devices, a fire detection device and a low pressure switch installed in the sprinkler system. Both electric
detection devices are wired into an approved control panel in a “cross-zoned” configuration. The electric
control panel controls a solenoid valve piped to the Victaulic Series 769 Actuated Valve piston. In the
event of a fire detection device activation and no pressure loss in the sprinkler system the control panel
will not trigger the solenoid valve and the valve will not actuate. If there is a loss of pressure in the sprinkler
system due to damage or a sprinkler activating and no fire detection the control panel will not trigger the
solenoid and the valve will not actuate. The valve will actuate ONLY when BOTH a fire detection event and
loss of system pressure occurs. When BOTH signals are received by the control panel the panel triggers
the solenoid valve. This allows the water supply pressure in the Series 769 diaphragm chamber to be
released and the valve will actuate allowing water into the system.
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