2
START-UP
The valve does not require any calibration or
adjustment prior to putting it into service.
In rare situations, it may be necessary to
“adjust” the
surge check
’s reduced area. If noted that the air &
vacuum valve
“slams” shut and/or there is a
significant pressure surge when the valve closes,
install a pipe plug in one of the tapped holes in the
surge check disc. If this does not mitigate the
slam/surge install another pipe plug. DO NOT PLUG
ALL THE HOLES.
PREVENTATIVE MAINTENANCE
No routine lubrication or adjustments are needed.
The valve should be visually to check for leaks. If
leakage is detected, see
TROUBLESHOOTING
to
resolve.
WARNING
Personal injury may occur if the valve is disassembled
while pressurized. Before attempting disassembly,
follow appropriate lockout/tag out procedures to
prevent accidental pressurization.
TESTING
The valve can be tested to ensure it is in good
working order.
1. Isolate the valve from the pipeline
2. Remove the pipe plug from the top of the
Figure 905 to de-pressurize the assembly
3. Remove the pipe plug in the side of the
Figure 930 just above the pipe flange
4. The float in the Figure 930 should fall as
water leaves the valve
5. Replace the pipe plugs and slowly open the
isolating valve
6. The Figure 930 float should rise and seal
tightly while the Figure 905 may continue to
release air for a while then close tightly.
TROUBLESHOOTING
SYMPTOM or PROBLEM
SOLUTION
Leakage from outlet of Air & Vacuum valve when closed
•
Debris lodged between float and seat
Remove debris, inspect for damage
•
Worn or damaged seat ring
Inspect, replace (See Figure 930 Repair Instructions)
•
Deformed or damaged float
Inspect, replace (See Figure 930 Repair Instructions)
Leakage from outlet of Air Release valve when closed
•
Debris lodged between orifice and orifice button
Remove debris, inspect for damage
•
Worn or damaged orifice or orifice button
Inspect, replace (See Figure 905 Repair Instructions)
•
Deformed or damaged float
Inspect, replace (See Figure 905 Repair Instructions)
REPAIR INSTRUCTIONS
Refer to the instructions for the inspection,
troubleshooting and repair of each of the valves used
in the Figure 983-D assembly.
REPLACEMENT PARTS
Genuine replacement parts are available from your
local GA Industries representative or from the factory:
VAG USA, LLC
234 Clay Avenue
Mars, PA 16046 USA
Telephone: 724-776-1020
Fax: 724-776-1254
E-mail:
Please have the nameplate data available when
ordering parts.
WARRANTY:
The Warranty for GA Industries valves is included in
our Terms and Conditions which can be found here:
https://gaindustries.com/terms
3
” and 4” Figure 983-D
