AVK 145 Series User manual

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
COPYRIGHT©AVK GROUP A/S 2020 - AVK INTERNATIONAL A/S, BIZONVEJ 1, DK-8464 GALTEN - WWW.AVKVALVES.EU MI GateValve 145 rev. AC 2020 GB
TABLE OF CONTENT
1. Introduction
2. Exploded view
3. Parts list
4. Receiving and storage
4.1 Unloading
4.2 Inspection after unloading
4.3 Storage
5. Installation and testing
5.1 Inspection prior to installation
5.2 Installation
5.3 Testing after installation
5.4 Application hazards
6. Operation and maintenance
6.1 Tools
6.2 Operation
6.3 Maintenance procedures
6.3.1 Inspection
6.3.2 Record keeping
7. Repair procedures
7.1 NRS valve repairs
7.1.1 Wrench nut repair
7.1.2 Upper stem seal components repair
7.1.3 Bonnet gasket replacement
7.2 OS&Y valve repairs
7.2.1 Handwheel replacement
7.2.2 Stem seal O-ring replacement
7.2.3 Supervisory switch installation
8. Troubleshooting guide
9. Parts and service

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
1. INTRODUCTION
AVK series 145 resilient wedge gate valves for use in fire protection are UL/FM approved and designed to be maintenance
free. They have a rated working pressure of 250 PSI and are available in DN65-200. All series 145 valves are configured for
CTC operation and have flanged end connections to ANSI B16.42 class 150. This manual will provide you with the information
needed to properly install and maintain the valves and to ensure a long service life.
2. EXPLODED VIEW
Page 2/12 MI GateValve 145 rev. AC 2020 GB
page 1
American AVK Series 145
Resilient Seated Gate Valve Exploded Parts Breakdown
Fig. 1
F220 F201
F221 F202
F225 F203
F261
F227 F262
F205
F228 F208
F230 F211
F231 F216
F230 F263
F229
F232 F218
F234
F233
F216
F217 F215
F218 F264
F237
F219 F219

3. PARTS LIST
4. RECEIVING AND STORAGE
4.1 UNLOADING
All valves should be unloaded carefully. Each valve should be carefully lowered from the truck to the ground; it should not be
dropped. Never lift valves by the wrench nuts or handwheels. Failure to carefully follow these recommendations is likely to
result in damage to the valve or personal injury.
INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 3/12 MI GateValve 145 rev. AC 2020 GB
Item Description Material
F201 Upper stem nut Copper alloy
F202 OS&Y handwheel Ductile iron, ASTM A536
F203 Anti friction washer Copper alloy
F205 Lower stem nut Copper alloy
F208 Gland follower Ductile iron, ASTM A536
F211 Stem seal O-rings SBR
F215 OS&Y stem assembly
Stainless steel stem
Wedge pin
Wedge
304 Stainless steel
304 Stainless steel
EPDM - encapsulated ductile iron core with
integral nylon wedge shoes
F216 Bonnet bolts Zinc plated steel
F217 NRS bonnet Ductile iron, ASTM A536
F218 Bonnet gasket NBR
F219 Body Ductile iron, ASTM A536
F220 Wrench nut/handwheel bolt Zinc plated steel
F221 Wrench nut/handwheel
washer
Zinc plated steel
F225 Wrench nut Ductile iron, ASTM A536
F227 Gland flange bolt Zinc plated steel
F228 Gland flange Ductile iron, ASTM A536
F229 Gland O-ring NBR
F230 Upper stem seal O-rings NBR
F231 Stem seal bushing Nylon
F232 Lower stem seal O-ring NBR
F233 Stainless NRS stem 304 Stainless steel
F234 Thrust collar Copper alloy
F237 NRS wedge EPDM - encapsulated ductile iron core with
integral akulon wedge shoes
F261 Gland follower bolt Zinc plated steel
F262 Gland follower washer Zinc plated steel
F263 Bonnet/yoke Ductile iron, ASTM A536
F264 OS&Y stem seal O-ring NBR

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 4/12 MI GateValve 145 rev. AC 2020 GB
4.2 INSPECTION AFTER UNLOADING
At the time of receipt, the resilient seated gate valves should be inspected for damage in shipment. The initial inspection should
verify compliance with specifications, direction of opening, size and shape of the operating nut, number of turns to open or
close, and type of end connections. A visual inspection of the seating surfaces should be performed to detect any damage
in shipment or scoring of the seating surfaces. Inspection personnel should look for bent stems, cracked parts, loose bolts,
missing parts and accessories, and any other evidence of mishandling during shipment. Each valve should be operated through
one complete opening and closing cycle in the position in which it is to be installed.
4.3 STORAGE
1. Resilient seated gate valves should be stored in a manner that protects them from the atmosphere, preferably indoors.
2. The valves should be stored with the wedges in the nearly closed position to prevent unnecessary compression of the
rubber compound.
3. The resilient wedges should also be protected from sunlight, ozone and chemical exposure.
4. In colder climates, valves should be drained and left slightly open before storage. Failure to do so may result in cracking
the valve castings.
5. Valves stored outside should be stored with the wedges in vertical position. If the valves are stored in horisontal or flat
position, rainwater may accumulate in the valve cavity, then freeze and crack the castings.
5. INSTALLATION AND TESTING
5.1 INSPECTION PRIOR TO INSTALLATION
1. Visually inspect each valve for any foreign material in the interior of the valve, and
remove it if present.
2. Inspect each valve in a similar manner as described in section 4.2 “INSPECTION AFTER
UNLOADING”.
5.2 INSTALLATION
1. All exposed bolts should be checked for proper tightness.
2. Where practical, valves should be located in easily accessible areas.
3. Valves should be supported and aligned to avoid damage to the valves. Valves should
not be used to correct misaligned piping.
4. Tighten bolts and nuts following the crossover method shown in Fig. 1 to load the pipe
and valve evenly and to prevent stress on the joints.
5.3 TESTING AFTER INSTALLATION
WARNING
The line must be isolated, depressurised and drained before installing or removing the valve
from the system line. Failure to do so may cause pressure to be released resulting in severe
injury or death.
NOTE
Before closing a fire protection system control valve for maintenance or inspection, permission to shut down the affected fire
protection systems must be obtained from the proper authorities, and all personnel who may be effected by this decision must
be notified.
It is recommended that automatic sprinkler systems are inspected, tested and maintained by a qualified inspection service.
The owner is responsible for inspection, maintenance and testing of the fire protection system and devices in accordance with
the applicable standards of the authorities having jurisdiction.
Fig. 1
1
2
3
45
6
7
8
page 4
INSTALLATION AND TESTING
INSPECTION PRIOR TO INSTALLATION:
1. Visually inspect each valve for any foreign material in the interior of the valve, and remove it if present.
2. Inspect each valve in a similar manner as described in the "INSPECTION AFTER UNLOADING" section of this manual.
INSTALLATION:
1. All exposed bolts should be checked for proper tightness.
2. Where practical, valves should be located in easily accessible areas.
3. Valves should be supported and aligned to avoid damage to the valves.
Valves should not be used to correct the misaligned piping.
4. Tighten the bolts and nuts in the crossover method shown in Fig. 2, to load the pipe and valve evenly and prevent stress
on the joints.
Fig. 2

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 5/12 MI GateValve 145 rev. AC 2020 GB
After installation, the newly installed piping sections, including valves, should be tested at some pressure above the system
designed pressure. The test pressure should not exceed the rated working pressure of the valve. After the test, any trapped
pressure in the body of the valve should be relieved. The resilient seated gate valve should not be operated in either the
opening or closing direction at differential pressures above the rated working pressure. It should be noted that valves seat
better at or near the rated working pressure of the valve. It is also recognised that wear or foreign material may damage valve
seating surfaces and may cause leakage.
Upon completion of the installation, valve location, size, brand, type, date of installation, number of turns to open, direction of
opening, and other information considered relevant should be entered on permanent records.
5.4 APPLICATION HAZARDS
1. Resilient seated gate valves should not be installed in lines where service pressure will exceed the rated working pressure
of the valve.
2. Resilient seated gate valves should not be used for throttling service unless the design is specifically recommended for that
purpose or approved in advance by the manufacturer.
3. Resilient seated gate valves should not be used in applications that are exposed to freezing temperatures.
4. Gate valves should not be installed in a dead end or near a bend in a pipeline without proper and adequate restraint to
support the valve and prevent it from blowing off the end of the line.
6. OPERATION AND MAINTENANCE
6.1 TOOLS
The following tool requirements are listed in both standard inch sizes as well as metric sizes.
PART INCH METRIC
Wrench nut retaining bolts
DN65-150 valves 1/2” 13mm (Open end wrench or socket)
DN200 valves 11/16” 17mm (Open end wrench or socket)
Gland flange retaining bolts
DN65 valves 3/8” 10mm (Allen wrench)
DN80-100 valves N/A 14mm (Allen wrench)
DN150-200 valves 11/16” 17mm (Allen wrench)
Gland follower/yoke retaining bolts
DN65-100 valves 3/8” 10mm (Allen wrench)
DN150-200 valves 11/16” 17mm (Allen wrench)
DN65 bonnet bolts 5/16” 8mm (Allen wrench)
DN80-200 bonnet bolts 3/8” 10mm (Allen wrench)

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 6/12 MI GateValve 145 rev. AC 2020 GB
6.2 OPERATION
Each valve should be operated through a complete cycle and returned to its normal position on a time schedule designed
to prevent a buildup of tuberculation or other deposits that could render the valve inoperable or prevent a tight shut-off. The
interval of time between operations of valves in critical locations, or valves subjected to severe operating conditions, should
be shorter than that for less important installations but can be whatever time period is found to be satisfactory based on local
experience. The number of turns required to complete the operation cycle should be recorded and compared with permanent
installation records to ensure full gate travel.
6.3 MAINTENANCE PROCEDURES
6.3.1 INSPECTION
Each valve should be operated through one complete cycle. If the stem action is tight as a result of “hard water” buildup on
the stem threads, the operation should be repeated several times until smooth opening an closing. With the gate in the partially
open position, a visual inspection should be performed, where practical, to check for leakages at all joints, connections, and
areas of packing or seals. If leakage is observed, all defective O-rings, seals, gaskets or end connection sealing parts should
be replaced. If the leakage can not be corrected immediately, the nature of the leakage should be reported promptly to those
who are responsible for repairs. If the valve is inoperable or irreparable, the precise valve location should be noted to save time
for repair crews. The condition of the valve and, if possible, the gate position should be reported to personnel responsible for
repairs. In addition, fire departments and other municipal departments should be informed that the valve is out of service.
6.3.2 RECORD KEEPING
In order to carry out a meaningful inspection and maintenance program, it is essential that the location, brand, type, size and
date of installation of each valve is recorded. Depending on the type of record system used, other information may be entered
in the permanent record. When a resilient seated gate valve is inspected, an entry should be made to the permanent record
indicating the date of inspection and condition of the valve. If repair work is necessary, this should be indicated. On completion
of the work, the nature of the repair and completion date should be recorded.
AVK series 145 NRS (Non-Rising Stem) valves - Turns to open
Valve size Turns to open
DN65 19
DN80 18
DN100 23
DN150 27
DN200 35
AVK series 145 OS&Y (Outside Stem and Yoke) valves - Turns to open
Valve size Turns to open
DN65 20
DN80 21
DN100 23
DN150 31
DN200 35

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 7/12 MI GateValve 145 rev. AC 2020 GB
7. REPAIR PROCEDURES
In most cases, in order to keep system downtime to a minimum, complete valve assembly replacement is implemented. This
may also be preferable due to physical access restrictions in the area of the valve. If this is the case, as in all installation/
maintenance and inspection procedures, follow all local installation and safety practices as directed by the authorities having
jurisdiction.
If system downtime is not an issue, the following procedures provide repair instructions for minor issues. Leakage, broken
parts, hard operation and other major defects should be corrected by a repair crew as soon as possible after the defect has
been reported. If repairs are to be performed in the field, the repair crew should take a full complement of spare parts to the job
site. Provisions should be made to isolate the defective valve from water pressure and relieve internal trapped pressure prior to
performing any corrective maintenance. Disassembly of the valve should be accomplished in accordance with the procedure
supplied in the following sections. After repairing the valve, the operating mechanism should be cycled through one complete
operating cycle. An inspection should be made with full line pressure applied to the valve in open position to detect leakage
in the areas around the seal plate, bonnet, packing gland and body-end connections. A record should be made to indicate
that the valve has been repaired and is in working condition. Any marking that the valve is inoperable should be removed. In
addition, fire department and other appropriate municipal departments should be informed of satisfactory repair of the valve.
7.1 NRS VALVE REPAIRS
7.1.1 WRENCH NUT REPAIR
WARNING
Although some of the following procedures can be performed
under full working line pressure, it is recommended that any
partial disassembly or maintenance will be performed with
the water main supply line shut off and after bleeding off the
pressure!
1. Remove the wrench nut bolt (F220) and wrench nut
washer (F221) using a 1/2” (13mm) wrench for DN65-100
valve sizes, and an 11/16” (17mm) wrench for DN150-200
valve sizes. Remove the wrench nut (F225) and replace
with a new one (Fig. 2A).
2. Replace the wrench nut bolt (F220) and wrench nut
washer (F221) using a 1/2” (13mm) wrench for DN65-100
valve sizes, and an 11/16” (17mm) wrench for DN150-200
valve sizes.
page 7
REPAIR PROCEDURES
In most instances, in order to keep system down time to a minimum, complete valve assembly replacement is
implemented. This also may be preferable due to physical access restrictions in the area of the valve in question. If this is the
case, as in all installation/maintenance and inspection procedures, follow all local installation and safety practices as directed
by the National Fire Protection Association, (NFPA #25 latest) and any other authorities having jurisdiction.
If system down time is not an issue, the following procedures provide repair instructions for minor issues. Leakage,
broken parts, hard operation, and other major defects should be corrected by a repair crew as soon as possible after the defect
has been reported. If repairs are to be performed in the field, the repair crews should take a full complement of spare parts to
the job site. Provisions should be made to isolate the defective valve from water pressure and relieve internal trapped pressure
prior to performing any corrective maintenance. Disassembly of the valve should be accomplished in accordance with the
procedure supplied in the following sections. After repairing the valve, the operating mechanism should be cycled through one
complete operating cycle. With full line pressure applied to the valve in the open position, an inspection should be made to
detect leakage in the areas around the seal plate, bonnet, packing gland, and body-end connections. A record should be made
to indicate that the valve has been repaired and is in working condition. Any marking that the valve is inoperable should be
removed. In addition, fire department and other appropriate municipal departments should be informed of satisfactory repair
of the valve.
NRS VALVE REPAIRS:
WRENCH NUT REPAIR:
WARNING: Although some of the following procedures can be
performed under full working line pressure, it is recommended
that any partial disassembly or maintenance be perform with the
Water Main Supply Line shut off and pressure bled!
1. Remove the Wrench Nut Bolt (F220) and Wrench Nut Washer
(F221) using a 1/2”, (13mm) wrench, for 2 1/2” to 4” valve
sizes, and 11/16”, (17mm) wrench for 6” to 8” valve sizes.
Remove the Wrench Nut (F225), and replace with a new one.
(See Fig.3A)
2. Replace the Wrench Nut Bolt (F220) and Wrench Nut Washer
(F221) using a 1/2”, (13mm) wrench, for 2 1/2” to 4” valve
sizes, and 11/16”, (17mm) wrench for 6” to 8” valve sizes.
Fig. 3A
F220
F221
F225
Fig. 2

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 8/12 MI GateValve 145 rev. AC 2020 GB
7.1.2 UPPER STEM SEAL COMPONENT REPAIR
CAUTION
With the valve in the fully open position, the following
procedures can be performed under full working pressure,
with no need to shut down the system.
1. Remove the wrench nut bolt (F220) and wrench nut
washer (F221) using a 1/2” (13mm) wrench for DN65-
100 valve sizes, and an 11/16” (17mm) wrench for
DN150-200 valve sizes. Remove the wrench nut (F225)
(Fig 3A).
2. Remove the two gland flange bolts (F227) using the
appropriate sized Allen wrench (see page 5).
3. Remove the gland flange (F228).
4. When performing step 3, verify the location of the
two upper stem seal O-rings (F230) and the stem seal
bushing (F231). They may be located on the stem
(F233) (Fig. 3A) or in the counterbore of the gland
flange (F228) (Fig. 3B).
5. There is a groove or recess in the bottom of the gland
flange (F228) for the gland O-ring (F229) (Fig. 3B).
6. Inspect and replace any damaged parts. Use a food
grade grease that contains no acetate or silicone on the
O-rings. Re-assemble in reverse order.
A
DETAIL A
SCALE 1 : 5
page 8
NRS (Non-Rising Stem) VALVE REPAIRS:
UPPER STEM SEAL COMPONENT REPAIR:
CAUTION: With the valve in the fully “OPEN” position, the
following procedures can be performed under full working
pressure, with no need to shut down the system.
1. Remove the Wrench Nut Bolt (F220) and Wrench Nut Washer
(F221) using a 1/2”, (13mm) wrench, for 2 1/2” to 4” valve
sizes, and 11/16”, (17mm) wrench for 6” to 8” valve sizes.
Remove the Wrench Nut (F225) . (See Fig.4A)
2. Remove the two Gland Flange Bolts (F227) using the
appropriate sized Allen Wrench. ( See page 5 )
3. Remove the Gland Flange (F228).
4. When performing step 3, verify the location of the Upper
Stem Seal O-rings, quantity 2, (F230) and the Stem Seal
Bushing (F231). They may be located on the Stem (F233),
(See Fig. 4A), or in the counterbore of the Gland Flange
(F228), (See Fig. 4B).
5. There is a groove or recess in the bottom of the Gland Flange
(F228), for the Gland O-ring (F229). (See Fig. 4B)
6. Inspect and replace any damaged parts. Use a food grade
grease that contains no acetate or silicone, on the o-rings.
Re-assemble in reverse order.
Fig. 4A
Fig. 4B
F220
F221
F225
F227
F228
F233
F230
F231
F230
F229
F228
F230
F231
F230
F229
Fig. 3A
A
DETAIL A
SCALE 1 : 5
page 8
NRS (Non-Rising Stem) VALVE REPAIRS:
UPPER STEM SEAL COMPONENT REPAIR:
CAUTION: With the valve in the fully “OPEN” position, the
following procedures can be performed under full working
pressure, with no need to shut down the system.
1. Remove the Wrench Nut Bolt (F220) and Wrench Nut Washer
(F221) using a 1/2”, (13mm) wrench, for 2 1/2” to 4” valve
sizes, and 11/16”, (17mm) wrench for 6” to 8” valve sizes.
Remove the Wrench Nut (F225) . (See Fig.4A)
2. Remove the two Gland Flange Bolts (F227) using the
appropriate sized Allen Wrench. ( See page 5 )
3. Remove the Gland Flange (F228).
4. When performing step 3, verify the location of the Upper
Stem Seal O-rings, quantity 2, (F230) and the Stem Seal
Bushing (F231). They may be located on the Stem (F233),
(See Fig. 4A), or in the counterbore of the Gland Flange
(F228), (See Fig. 4B).
5. There is a groove or recess in the bottom of the Gland Flange
(F228), for the Gland O-ring (F229). (See Fig. 4B)
6. Inspect and replace any damaged parts. Use a food grade
grease that contains no acetate or silicone, on the o-rings.
Re-assemble in reverse order.
Fig. 4A
Fig. 4B
F220
F221
F225
F227
F228
F233
F230
F231
F230
F229
F228
F230
F231
F230
F229
Fig. 3B

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, at 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, at 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

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 10/12 MI GateValve 145 rev. AC 2020 GB
7.2 OS&Y VALVE REPAIRS
7.2.1 HANDWHEEL REPLACEMENT (Fig. 5A and 5B)
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
As most OS&Y valves are used in fire protection applications,
verify that any alarm system has been disabled prior to
performing any maintenance or repair.
1. Remove the hot melt glue that covers the bonnet bolts
(F216) using a small, flat bladed screwdriver (Fig. 5A).
2. Once the hot melt glue has been removed, use a 5/16”
(8mm) Allen wrench to remove the DN65 valve bonnet
bolts (F216) and a 3/8” (10mm) Allen wrench for valve
sizes DN80-200.
3. Turn the remaining part of the handwheel (F202) in the
closing direction. This will lift the yoke/bonnet (F263)
head assembly, allowing removal of the upper stem nut
(F201) from the stem assembly (F215).
4. Remove the upper half of the stem nut (F201) from the
handwheel and place it in the new handwheel (F202).
NOTE: The stem nut pair is keyed with different sized
lugs. Make sure to align the lugs in the correct location
(Fig. 5B)!
5. Align the upper stem nut (F201) with the lower stem nut
(F205), and ensure that there is full engagement of the
lugs.
6. Carefully turn the handwheel (F202) in the opening
direction until the yoke/bonnet (F263) is fully down and
resting on the body (F219).
CAUTION: When lowering the head assembly back on
the body, ensure that the bonnet gasket (F218) is not
damaged.
7. Install the bonnet bolts (F216), ensuring they are inserted
through the bonnet gasket (F218) and tighten in a
diametrically opposite pattern.
8. To replace the protective hot melt glue over the bonnet
bolts, use any EPA approved caulk or hot melt glue.
9. Repressurise the system. If there is a leak around the
stem seal O-ring area, make sure that the upper gland
follower bolts (F261) are screwed down evenly into the
bonnet/yoke (F263). Tighten the nuts 1/4 turn each until
the leak stops.
NOTE: Since UL, ULC and FM approvals are for the
manufacturer, this procedure will have no effect on
listings or approvals.
page 10
OS&Y (Outside Stem & Yoke) VALVE REPAIRS:
HANDWHEEL REPLACEMENT (Figs.6A,6B)
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: As most OS&Y valves are used in fire protection
applications, verify that any alarm systems have been
disabled prior to performing any maintenance or repairs.
1. Using a small, at bladed screwdriver, remove the hot melt
glue that covers the Bonnet Bolts (F216).
( See Fig. 6A )
2. Once the hot melt glue has been removed, use 5/16", or 8mm
Allen wrench to remove the 2½" valve Bonnet Bolts (F216),
and a 3/8”, or 10mm Allen wrench for valve sizes 3"- 8".
3. Turn the remaining part of the Handwheel (F202) in the
closing direction. This will lift the Yoke/Bonnet (F263) head
assembly, allowing removal of the Upper Stem Nut (F201),
from the Stem Assembly (F215).
4. Remove the upper half of the Stem Nut (F201) from the
handwheel and place it in the “new Handwheel” (F202).
NOTE: The Stem Nut pair are keyed with different sized lugs.
Be sure to align the lugs in the correct location!
(See Fig. 6B)
5. Align the Upper Stem Nut (F201), with the Lower Stem Nut
(F205), And insure that there is full engagement of the lugs.
6. Carefully turn the Handwheel (F202) in the opening direction
until the Yoke/Bonnet (F263), is fully down and resting on the
Body (F219).
CAUTION: When lowering the head assembly back on the body,
take care to ensure that the Bonnet Gasket (F218), is not
damaged.
7. Install the Bonnet Bolts (F216), taking care to ensure they are
inserted through the Bonnet Gasket (F218), and tighten in a
diametrically apposed pattern.
8. To replace the protective hot melt glue over the Bonnet Bolts,
use any EPA approved caulk, or hot melt glue.
9. Repressurize the system. At this time, if there is a leak
around the Stem Seal O-ring area, be sure that the upper
Gland Follower Bolts (F261) are screwed down evenly in to
the Bonnet/Yoke (F263). Tighten the nuts 1/4 turn each until
the leak stops.
NOTE: Since UL , ULC and FM Approvals are for the
Manufacturer, this procedure will have no effect on
listings or approvals.
Fig. 6A
Fig. 6B
F201
F202
F263
F215
OS&Y Stem Nut Pair (F201
andF205) are drilled and
tapped as a pair
F201
F205
F205
F219
Fig. 5A
page 10
OS&Y (Outside Stem & Yoke) VALVE REPAIRS:
HANDWHEEL REPLACEMENT (Figs.6A,6B)
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: As most OS&Y valves are used in fire protection
applications, verify that any alarm systems have been
disabled prior to performing any maintenance or repairs.
1. Using a small, at bladed screwdriver, remove the hot melt
glue that covers the Bonnet Bolts (F216).
( See Fig. 6A )
2. Once the hot melt glue has been removed, use 5/16", or 8mm
Allen wrench to remove the 2½" valve Bonnet Bolts (F216),
and a 3/8”, or 10mm Allen wrench for valve sizes 3"- 8".
3. Turn the remaining part of the Handwheel (F202) in the
closing direction. This will lift the Yoke/Bonnet (F263) head
assembly, allowing removal of the Upper Stem Nut (F201),
from the Stem Assembly (F215).
4. Remove the upper half of the Stem Nut (F201) from the
handwheel and place it in the “new Handwheel” (F202).
NOTE: The Stem Nut pair are keyed with different sized lugs.
Be sure to align the lugs in the correct location!
(See Fig. 6B)
5. Align the Upper Stem Nut (F201), with the Lower Stem Nut
(F205), And insure that there is full engagement of the lugs.
6. Carefully turn the Handwheel (F202) in the opening direction
until the Yoke/Bonnet (F263), is fully down and resting on the
Body (F219).
CAUTION: When lowering the head assembly back on the body,
take care to ensure that the Bonnet Gasket (F218), is not
damaged.
7. Install the Bonnet Bolts (F216), taking care to ensure they are
inserted through the Bonnet Gasket (F218), and tighten in a
diametrically apposed pattern.
8. To replace the protective hot melt glue over the Bonnet Bolts,
use any EPA approved caulk, or hot melt glue.
9. Repressurize the system. At this time, if there is a leak
around the Stem Seal O-ring area, be sure that the upper
Gland Follower Bolts (F261) are screwed down evenly in to
the Bonnet/Yoke (F263). Tighten the nuts 1/4 turn each until
the leak stops.
NOTE: Since UL , ULC and FM Approvals are for the
Manufacturer, this procedure will have no effect on
listings or approvals.
Fig. 6A
Fig. 6B
F201
F202
F263
F215
OS&Y Stem Nut Pair (F201
andF205) are drilled and
tapped as a pair
F201
F205
F205
F219
Fig. 5B

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 11/12 MI GateValve 145 rev. AC 2020 GB
7.2.2 STEM SEAL O-RING REPLACEMENT (Fig. 6A and
6B)
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
As most OS&Y valves are used in fire protection
applications, verify that any alarm system has been
disabled prior to performing any maintenance or repair.
1. Remove the two upper gland follower bolts (F261) and
associated washers (F262). Lift up the gland follower
(F208) to expose the stem seal O-rings (F211) (Fig. 6A).
2. Use a small screwdriver or probe to access the three
stem seal O-rings (F211).
NOTE: These O-rings are split-type O-rings. When
replacing them, ensure that the splits DO NOT align.
Rotate the splits at approximately 30 degree intervals.
Use a light coat of FDA approved food grade grease for
lubrication (Fig. 6B).
3. Reverse steps 2 and 3 for re-assembly.
CAUTION: Do not over-tighten the upper pair of gland
follower bolts (F261). Tighten the bolts evenly so the
gland follower applies an even pressure on the O-rings.
If the gland follower is assembled at an angle, leaks
may occur.
4. Repressurise the system. If there is a leak around the
gland follower (F208), make sure that gland follower
bolts (F261) are screwed down evenly on the gland
follower (F208). Tighten the bolts 1/4 turn each until the
leak stops.
page 11
OS&Y (Outside Stem & Yoke) VALVE REPAIRS:
STEM SEAL O-RING REPLACEMENT
(Figs.7A,7B)
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: As most OS&Y valves are used in fire protection
applications, verify that any alarm systems have been
disabled prior to performing any maintenance or repairs.
1. Remove the two upper Gland Follower Bolts (F261)
and associated Washers (F262). Lift the Gland Follower
(F208) up expose the Stem Seal O-rings (F211). (See Fig. 7A)
2. Use a small screwdriver or probe to access the three Stem
Seal O-rings (F211).
NOTE: These O-rings are split-type o-rings. When replacing
them, insure that the splits DO NOT align. Rotate the
splits at approximately 30 degree intervals. Use a light
coat of FDA approved, food grade grease for lubrication.
(See Fig. 7B)
3. Reverse steps 2 and 3 for re-assembly.
CAUTION: Do not over tighten the upper pair of Gland Follower
Bolts (F261). Tighten the bolts evenly so the Gland Follower
applies even and level pressure on the O-rings. If the Gland
Follower is assembled at an angle, leaks may occur.
4. Repressurize the system. At this time, if there is a leak
around the Gland Follower (F208) be sure that Gland Follower
Bolts (F261) are screwed down evenly on the Gland Follower
(F208). Tighten the bolts 1/4 turn each until the
leak stops.
Fig. 7A
Fig. 7B
F211
F261
F262
F208
F211
Fig. 6A
page 11
OS&Y (Outside Stem & Yoke) VALVE REPAIRS:
STEM SEAL O-RING REPLACEMENT
(Figs.7A,7B)
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: As most OS&Y valves are used in fire protection
applications, verify that any alarm systems have been
disabled prior to performing any maintenance or repairs.
1. Remove the two upper Gland Follower Bolts (F261)
and associated Washers (F262). Lift the Gland Follower
(F208) up expose the Stem Seal O-rings (F211). (See Fig. 7A)
2. Use a small screwdriver or probe to access the three Stem
Seal O-rings (F211).
NOTE: These O-rings are split-type o-rings. When replacing
them, insure that the splits DO NOT align. Rotate the
splits at approximately 30 degree intervals. Use a light
coat of FDA approved, food grade grease for lubrication.
(See Fig. 7B)
3. Reverse steps 2 and 3 for re-assembly.
CAUTION: Do not over tighten the upper pair of Gland Follower
Bolts (F261). Tighten the bolts evenly so the Gland Follower
applies even and level pressure on the O-rings. If the Gland
Follower is assembled at an angle, leaks may occur.
4. Repressurize the system. At this time, if there is a leak
around the Gland Follower (F208) be sure that Gland Follower
Bolts (F261) are screwed down evenly on the Gland Follower
(F208). Tighten the bolts 1/4 turn each until the
leak stops.
Fig. 7A
Fig. 7B
F211
F261
F262
F208
F211
Fig. 6B

INSTALLATION, OPERATION AND MAINTENANCE MANUAL – ORIGINAL VERSION
AVK GATE VALVES FOR WATER AND FIRE PROTECTION
SERIES 145
Page 12/12 MI GateValve 145 rev. AC 2020 GB
7.2.3 SUPERVISORY SWITCH INSTALLATION (Fig. 7A)
1. AVK series 145 OS&Y valves have a pre-tapped 1/2”
NPT threaded hole in the yoke/bonnet (F263) for
mounting a supervisory switch (Fig. 7A).
2. With the valve in fully open position, there is a stem
groove that allows the switch to indicate the open
position.
3. Refer to the switch manufacturer’s instructions for
correct switch installation.
8. TROUBLESHOOTING GUIDE
WARNING
The valve must be isolated before performing any
maintenance. Failure to do so may cause pressure to be
released resulting in severe injury or death.
Several problems and solutions are presented below to
assist you in troubleshooting the valve.
PROBLEM: Valve leaking around stem/gland flange
Probable cause: Damaged or worn O-rings.
Corrective action: Refer to the upper and lower stem
seal component repair sections of
this manual and replace the O-rings.
PROBLEM: Valve leaking around bonnet and body
Probable cause: Bonnet bolts loose.
Corrective action: Tighten bonnet bolts.
Probable cause: Damaged bonnet gasket.
Corrective action: Replace bonnet gasket
PROBLEM: Valve leaking around pipe connections
Corrective action: Tighten flange hardware.
Corrective action: Verify gasket is not damaged.
Replace if necessary.
PROBLEM: Valve hard to operate
Probable cause: Gland bolts too tight or unevenly tightened.
Corrective action: Loosen and then re-tighten gland bolts evenly.
Probable cause: If the valve has not been operated over a prolonged period of time, build-up may occur on the internal
parts.
Corrective action: Open or close the valve one turn at a time until fully opened or closed. Repeat the process a few times
and then flush the system to remove any debris.
Probable cause: Pressure build-up in system.
Corrective action: Relieve pressure and bleed off any air build-up.
9. PARTS AND SERVICE
For information on parts and service for your area, please contact AVK International A/S. Make a note of the valve model
number and size which is to be found on the valve and contact:
AVK International A/S
Bizonvej 1
DK 8464 Galten
T: [phone]
www.avkvalves.eu
page 12
OS&Y (Outside Stem & Yoke) VALVE REPAIRS:
SUPERVISORY SWITCH INSTALLATION
(Fig.8A)
1. AVK Series 145 OS&Y valves have a pre-tapped, 1/2" NPT
threaded hole in the Yoke/Bonnet (F263), for mounting a
Supervisory Switch. (See Fig. 8A)
2. With the valve in the fully open position, there is a stem groove
that allows the switch to indicate the open position.
3. Refer to the switch manufacturer's instructions for correct
switch installation.
Fig. 8A
1/2" NPT
tapped hole
F263
Supervisory
Switch
Stem
groove
Fig. 7A