Victaulic FireLock NXT 776 Series User Manual

INSTALLINGTHECOVERPLATEGASKETANDCOVERPLATE
CAUTION
UseonlyVictaulic-suppliedreplacementparts.•
Failuretofollowthisinstructioncouldcauseimpropervalve
operation,resultinginpropertydamage.
1. Verify that the cover plate gasket is in good condition. If the gasket
is torn or worn, replace it with a new, Victaulic-supplied gasket.
2. Align the holes of the cover plate gasket with the holes in the cover
plate.
3. Insert one cover plate bolt through the cover plate and cover plate
gasket to ease alignment. NOTE: For 1 ½-inch/48.3-mm and
2-inch/60.3-mm valve sizes, a washer must be re-installed under
the head of each cover plate bolt.
CAUTION
DONOTover-tightenthecoverplatebolts.•
Failuretofollowthisinstructioncouldcausedamagetothe
coverplategasket,resultinginvalveleakage.
4. Align the cover plate/cover plate gasket to the valve. Make sure the
clapper spring’s arms are rotated to their installed position. Tighten
all cover plate bolts into the cover plate/valve body.
5. Torque all cover plate bolts in an even, crossing pattern. Refer
to the “Required Cover Plate Bolt Torques” table below for the
required torque values. DO NOT over-tighten the cover plate bolts.
REQUIREDCOVERPLATEBOLTTORQUES
Size Torque
NominalSize
inches
Actual
OutsideDiameter
inches
mm
ft-lbs
N•m
1 ½
1.900 30
48.3 41
2
2.375 30
60.3 41
2 ½
2.875 60
73.0 81
76.1 mm
3.000 60
76.1 81
3
3.500 60
88.9 81
4
4.500 100
114 . 3 136
165.1 mm
6.500 115
165.1 156
6
6.625 115
168.3 156
8
8.625 100
219.1 136
6. Place the system back in service by following the “Placing the
System in Service” section.
I-769D_41
FireLockNXT™DelugeValve
SERIES 769
I-769DINSTALLATION,MAINTENANCE,ANDTESTINGMANUAL
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VICTAULIC IS A REGISTERED TRADEMARK OF VICTAULIC COMPANY. © 2007 VICTAULIC COMPANY. ALL RIGHTS RESERVED. PRINTED IN THE USA.
REV_D

Victaulic FireLock NXT 776 Series Specifications

General

Brand	Victaulic
Model	FireLock NXT 776 Series
Category	Control Unit
Language	English