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