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)