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