8 Series 769 FireLock NXT™ Preaction Valve
30.82
OPERATION
The Victaulic Preaction System utilizes the Series 769 Preaction Valve to control the entry of the water
supply into the Preaction System piping and sprinklers. The Series 769 Preaction Valve is constructed
with a clapper having a replaceable rubber face. The clapper makes contact with the valve seat ring
which has access holes to the intermediate chamber of the valve. The clapper is contacted by the latch
which is contacted by the diaphragm. In the set position, water supply pressure from upstream of the
water supply control valve is maintained in the diaphragm chamber which holds the clapper in the closed/
set position. The water is maintained in the diaphragm by one of the system release mechanisms
(pneumatic, hydraulic or electric). Upon the detection of an appropriate actuating event of the Preaction
System (see system description above) the water supply pressure in the diaphragm chamber is released.
This release allows the latch to move to its open position, permitting the clapper to pivot freely, thus
allowing water into the system. Water will flow from all open sprinklers in the piping. Also, water enters the
intermediate chamber of the valve through the holes in the seat ring. The water flows from the
intermediate chamber to the alarm line thus activating the system alarms. These alarms will continue to
sound until the flow of water is stopped. When the flow of water is stopped the spring assisted valve
clapper returns to the closed position and the valve acts as an alarm check valve until the system is put
back into service as a Preaction System.
Manual Operation
Any time the manual release handle is pulled water will be released from the diaphragm chamber and the
valve will actuate, allowing water into the Preaction System. Water motor alarms and alarm pressure
switches will activate.
WARNING
• This product must be installed by an experienced, trained installer, in accordance with the instructions
provided with each valve. These instructions contain important information.
Failure to follow these instructions may result in serious personal injury, property damage, or valve
leakage.
If you need additional copies of this product literature or the valve installation instructions, or if you have
any questions about the safe installation and use of this device, contact Victaulic Company, P.O. Box 31,
Easton, PA 18044-0031 USA, Telephone: 001-610-559-3300.
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