Victaulic FireLock NXT 764 Series, FireLock NXT 768 Series, FireLock NXT 769 Series Replacement Instructions Manual
Water Supply Main
Control Valve
Series 764, 768 and 769
REPLACING THE DIAPHRAGM IN SERIES 764, 768, AND 769 FIRELOCK NXT™ FIRE PROTECTION VALVES
IMPORTANT INFORMATION
WARNING WARNING
I-NXT.DIAREPLACEMENT KIT INSTRUCTIONS
Read and understand all instructions •
before attempting to perform maintenance
on any Victaulic piping products.
Wear safety glasses, hardhat, and foot •
protection.
Failure to follow these instructions could
result in serious personal injury, property
damage, and/or product failure.
The following instructions are a guide for removing and replacing the diaphragm in Series 764, 768,
and 769 FireLock NXT™ Fire Protection Valves. It is important to replace the diaphragm with a new,
Victaulic-supplied diaphragm of the correct diameter to ensure proper valve operation.
REMOVING THE SYSTEM FROM SERVICE
CAUTION
Any activities that require taking the •
valve out of service may eliminate the fire
protection provided.
Before servicing or testing the system, •
notify the authority having jurisdiction.
Consideration of a fire patrol should be •
given in the affected areas.
Failure to follow these instructions could
result in serious personal injury and/or
property damage.
Depressurize and drain the piping •
system before attempting to remove,
adjust, or perform maintenance on any
Victaulic piping products.
Failure to follow this instruction could
result in serious personal injury and/or
property damage.
1. Notify the authority having jurisdiction, remote station alarm monitors, and those in the affected area that the system is being taken
out of service.
2. Open the water supply main drain valve fully to flush the water
supply of any contaminants.
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VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2009 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
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3. Close the water supply main drain valve.
4. Close the water supply main control valve to take the system out of
service.
I-NXT.DIA_1
REPLACEMENT KIT INSTRUCTIONS
Series 764, 768 and 769
REPLACING THE DIAPHRAGM IN SERIES 764, 768, AND 769 FIRELOCK NXT™ FIRE PROTECTION VALVES
NOTE: If the system has operated, open the remote system test valve
(inspector’s test connection) and any auxiliary drain valves.
5. Open the water supply main drain valve.
6. Confirm that water is not flowing from the water supply main drain
valve.
9. Close the slow-fill ball valve on the Air Maintenance Trim Assembly
(AMTA).
10. PUSH DOWN ON THE AUTO DRAIN SCREW TO REMOVE
PRESSURE IN THE DIAPHRAGM CHARGE LINE.
I-NXT.DIA
7. Close the diaphragm-charge-line ball valve.
8. Open the system main drain valve to drain any water that has
accumulated and to release system air pressure.
www.victaulic.com
VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2009 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
I-NXT.DIA_2
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