AVK SUPPORTExpect... AVK
AVK SUPPORTOPERATION AND MAINTENANCE
OPERATION
WARNING: Flush the system prior to operating valves to prevent damage to seats and plugs.
1. Do not operate the valves in a system that exceed the valves rated working pressure of 250 PSI.
2. AVK Eccentric Plug Valves are “Open Left” or counter-clockwise to open, quarter turn or 90 degrees to open or close.
3. Manually actuated valves have mechanical stops for the open and closed positions that are clearly marked on the Stop
Plate (F718). There are also detents in the Stop Plate (F718), if valve throttling is desired. ( See Fig. 5 )
4. For valves with gearboxes, the number of turns to open and close are as follows:
2½”, 3″, and 4″ – 8.5 turns
6″ – 9.5 turns
8″ – 12 turns
10″ and 12″ – 24 turns
5. Valve operation and cycling should be scheduled more frequently for systems that have higher solid contents in the water.
6. Never force the valve to seat. Re-open the valve and flush the system again to verify that debris has been dislodged from
the seating area.
MAINTENANCE
WARNING: Flush the system prior to operating valves to prevent damage to seats and plugs. When performing
maintenance that requires disassembly on valves, ensure that the system pressure is at 0 PSI.
1. AVK Eccentric Plug Valves are designed to be relatively maintenance free. Do not disassemble valves unless an
interruption to normal service has occurred in the system.
2. Periodic lubrication is not required. Lubrication is only required if disassembly/reassembly of the valve is performed.
3. Regular functional inspections should be performed at a minimum of twice a year. When performing a functional
inspection, operate the valves under normal working pressure, making sure they operate normally without any vibrations.
4. For valves with gearboxes, refer to the gearbox manufacturer’s maintenance procedures.
5. Proper records should be maintained for all maintenance procedures and schedules.