INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 9/12
MI GateValve 145 rev. AC 2020 GB
7.1.3 BONNET GASKET REPLACEMENT
WARNING
To perform the following steps, make sure that the water
main supply line has been shut off and that the pressure has
been bled off!
NOTE
Ensure that the valve is in fully open position to ease head
assembly removal.
1. Remove the hot melt glue that covers the bonnet bolts
(F216) using a small, flat bladed screwdriver (Fig. 4A).
2. Once the hot melt glue has been removed, use a 5/16”
(8mm) Allen wrench to remove the valve bonnet bolts
(F216) from DN65 valves. For DN80-200 valves, use a
3/8” (10mm) Allen wrench (Fig. 4B).
3. Replace the bonnet gasket (F218). Place the bonnet
gasket into the relief in the bonnet (F217) and insert the
bonnet bolts (F216) into the bolt holes in the bonnet
(F217) and through the bonnet gasket (F218).
4. Re-assemble in reverse order, torquing the bonnet bolts
to 40 ft. lbs. in a diametrically opposite pattern (180
degrees apart).
5. To replace the protective hot melt glue over the bonnet
bolts, use any EPA approved caulk or hot melt glue.
NOTE
The procedure for bonnet gasket replacement can also be
used on OS&Y assemblies.
page 9
NRS (Non-Rising Stem) VALVE REPAIRS:
BONNET GASKET REPLACEMENT
WARNING:
To perform the following steps, be sure the Water
Main Supply Line has been shut off, and that the pressure has
been bled off!
NOTE:
Ensure that the valve is in the fully open position to ease
head assembly removal.
1. Using a small, flat bladed screwdriver, remove the hot melt
glue that covers the Bonnet Bolts (F216).
( See Fig. 5A )
2. Once the hot melt glue has been removed, use 5/16", or 8mm
Allen wrench to remove the 2½" vavle Bonnet Bolts (F216),
and a 3/8”, or 10mm Allen wrench for valve sizes 3"- 8".
( See Fig. 5B )
3. Replace the Bonnet Gasket (F218). Place the Bonnet gasket
into the relief in the Bonnet (F217), and insert the Bonnet
Bolts (F216), into the bolt holes in the Bonnet (F217), and
through the Bonnet Gasket (F218).
4. Re-assemble in reverse order, torquing the Bonnet Bolts to 40
ft. lbs., in a diametrically opposed (180 degrees apart) pattern.
5. To replace the protective hot melt glue over the Bonnet Bolts,
use any EPA approved caulk, or hot melt glue.
NOTE:
The Bonnet Gasket procedures can also be used on
OS&Y assemblies.
Fig. 5A
Fig. 5B
F216
F218
F217
Fig. 4A
page 9
NRS (Non-Rising Stem) VALVE REPAIRS:
BONNET GASKET REPLACEMENT
WARNING:
To perform the following steps, be sure the Water
Main Supply Line has been shut off, and that the pressure has
been bled off!
NOTE:
Ensure that the valve is in the fully open position to ease
head assembly removal.
1. Using a small, flat bladed screwdriver, remove the hot melt
glue that covers the Bonnet Bolts (F216).
( See Fig. 5A )
2. Once the hot melt glue has been removed, use 5/16", or 8mm
Allen wrench to remove the 2½" vavle Bonnet Bolts (F216),
and a 3/8”, or 10mm Allen wrench for valve sizes 3"- 8".
( See Fig. 5B )
3. Replace the Bonnet Gasket (F218). Place the Bonnet gasket
into the relief in the Bonnet (F217), and insert the Bonnet
Bolts (F216), into the bolt holes in the Bonnet (F217), and
through the Bonnet Gasket (F218).
4. Re-assemble in reverse order, torquing the Bonnet Bolts to 40
ft. lbs., in a diametrically opposed (180 degrees apart) pattern.
5. To replace the protective hot melt glue over the Bonnet Bolts,
use any EPA approved caulk, or hot melt glue.
NOTE:
The Bonnet Gasket procedures can also be used on
OS&Y assemblies.
Fig. 5A
Fig. 5B
F216
F218
F217
Fig. 4B