Series 756 FireLock
®
European Dry Valve Stations
26
Cover Bolt Torque Requirements
6. Place the system back in service by following the “Placing
the System in Service” section, starting on page 11.
Removing and Replacing Piston Assembly
1. Perform steps 1 - 7 of the “Required Internal Inspection”
section, starting on page 21.
2. Disconnect the trim from the piston.
3. Remove the piston from the valve body.
4. Clean the back of the valve body to remove any debris that
may interfere with proper piston seating.
5. Replace the piston with a new, Victaulic-supplied assem-
bly. Make sure the o-ring is installed flush to the piston body.
Tighten the piston into the valve body until metal-to-metal con-
tact occurs.
6. Re-attach the trim. Refer to the applicable trim drawing for
complete details.
7. Place the system back in service by following the “Placing
the System in Service” section, starting on page 11.
Valve
Size
Torque
N•m
DN 100 136
DN 150 156
WARNING
• Depressurize and drain the piping system
before attempting to install, remove, or adjust
any Victaulic piping products.
Failure to follow this instruction could cause
product failure, resulting in serious personal
injury and/or property damage.
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 cause seri-
ous personal injury and/or property damage.
CAUTION
• DO NOT extend the piston manually. Manually extending the piston could
damage the internal diaphragm.
Failure to follow this instruction could result in improper valve operation and/
or valve leakage
CAUTION
• Make sure the piston is reinstalled correctly.
Failure to follow this instruction could cause
improper valve operation.
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