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
4
5
6
7
8
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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