GA FIGURE 942 User manual

Manual Number 942.2-IOM-111320
INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
FIGURE 942
3”, 4”& 6”Drawings ECAV7131, ECAV7118
COMBINATION AIR VALVES
FOR SEWAGE & WASTEWATER
TABLE OF CONTENTS
Introduction ….………………………… 2
Description of Operation .....………… 2
Receiving & Storage .....……………… 2
Installation ......…………………………. 2
Valve Construction ......………………. 3
Preventive Maintenance ....………….. 3
Trouble Shooting ...…………………… 3
Disassembly....………………………… 3, 4
Reassembly ....…………………………. 4
Backflushing Instructions …………… 5
Order Replacement Parts …………….. 5
Warranty .……………………………….. 5
Figure 942 Drawing/Parts List …….….. 6
234 Clay Avenue • Mars, PA 16046 USA
Telephone [phone] • Fax [phone]
E-mail: [e-mail]

2
INSTALLATION, OPERATION and
MAINTENANCE
Figure 942 Sewage Combination Air Valves
INTRODUCTION
This manual will provide the information to
properly install, operate and maintain the valve
to ensure a long service life. The GA Industries
Figure 942 Combination Air Valve is ruggedly
constructed to provide years of trouble-free
operation with minimal maintenance.
CAUTION
The valve is NOT recommended for use with
toxic fluids, fuels or fluids containing hazardous
gases
CAUTION
The valve will not function if used at a pressure
higher than the maximum working pressure
indicated on the nameplate.
The Shop Order (SO) Number, Figure Number,
size and pressure rating are stamped on a
nameplate attached to the valve. Please refer to
the SO number when ordering parts.
DESCRIPTION OF OPERATION
The Figure 942 Combination Air Valve is
designed to vent air through its large orifice as
the system is being filled with liquid and close
tight when the system is full and pressurized.
The valve automatically opens to admit air
through the large orifice during draining or when
the internal pressure falls below atmospheric.
The valve also releases air and sewage gas that
has accumulated within the valve while the
system is pressurized and operational.
These valves are usually installed at high points
in the system where air tends to collect and
vacuum conditions initially form during draining.
When empty of liquid, both the large and small
orifices are open allowing air to be vented ahead
of incoming liquid. The float rises when water
enters the valve and closes the orifices. As air
and sewage gas accumulate in the valve it
forces the water level down until the float drops
and opens the small air release orifice while the
large orifice remains closed. As air is released
the water level rises lifting the float and re-
closing the small orifice. This sequence occurs
as often as necessary to release air and gas that
has collected in the valve.
Should the pressure inside the valve fall below
atmospheric both the large and small orifices
open to allow air to be drawn into the system to
alleviate vacuum conditions.
RECEIVING AND STORAGE
Inspect the valve upon receipt for damage
during shipment. Carefully unload all valves to
the ground without dropping.
The valves should remain in a clean, dry and
weather protected area until installed. For long
term storage (greater than 6 months) the rubber
surfaces of the seat should be coated with a
non-toxic lubricant such as "SuperLube" made
by Synco Chemical. Do not expose the rubber
parts to sunlight or ozone.
INSTALLATION
Sizes 3”and 4”Figure 942 can be supplied with
an NPT or Class 125 pipeline connection; the 6”
has Class 125 flanged pipeline connection.
Consult the drawings of record to verify the
configuration supplied and installed.
The valve must be installed in an upright vertical
orientation, normally at a high point in the
system.
If installed outdoors, below ground in a vault or
in an unheated area, adequate freeze protection
must be provided.
An isolating valve should be installed between
the valve and the pipeline or system to facilitate
maintenance (included with backflushing
attachments).
Carefully screw threaded end valves onto pipe
nipple using compatible thread sealant. Tighten

3
valve using wrench flats. DO NOT OVER-
TIGHTEN.
Flat-faced flanged valves should be mated with
flat-faced flanges and full-face gaskets. If ring
gaskets are used the bolt material shall be
ASTM A307 Grade B (or equivalent). Higher
strength bolting should only be used with full-
face gaskets.
Lower heavy valves over the mating flange
using slings or chains around the valve body.
Lubricate the bolts or studs and insert around
flange. Lightly tighten bolts until gaps are
eliminated. Torque bolts in an alternating
pattern in graduated steps. If leakage occurs
wait 24 hours and re-torque the bolts but do not
compress the gasket more than 50% or exceed
bolt maximum torque rating.
VALVE CONSTRUCTION
The standard Figure 942 Sewage Combination
Air Valve has a cast iron body, 316 stainless
steel float and linkage mechanism and a Buna-N
rubber seat. It has a working pressure range of
10 to 150 PSI. Optional materials can be
provided for higher working pressures. Refer to
the List of Materials submitted for the order if
non-standard materials were provided.
Refer to Page 6 for details of construction and
parts location.
The valve has an inlet connection at the bottom
where the valve attaches to the system and an
outlet connection at the top through which air
exits and enters the valve.
WARNING
Removing the valve from the line or
disassembling the valve while there is pressure
in the valve body may result in injury or damage
to the valve
PREVENTIVE MAINTENANCE
Figure 942 Sewage Combination Air Valves
require no scheduled lubrication or adjustment.
A periodic visual inspection should be performed
to ensure the outlet piping is not obstructed and
to verify there is no fluid leakage.
Depending on the nature of the fluid, sewage air
valves may become clogged with sediment or
grease and require periodic cleaning. To
facilitate such cleaning GA Industries air valves
with an “F” at the end of the Figure Number
(e.g., 942F) were supplied with “backflushing
attachments.” Refer to the backflushing
instructions on Page 4 of this manual for
additional information.
TESTING
Valve operation can be easily tested. Close the
inlet isolation valve and remove or loosen the
pipe plug nearest the inlet to drain the water
from the valve. The float should drop as the
water leaves the valve. NOTE: A manual valve
can be installed in place of the pipe plug to
facilitate testing (valves are included with
backflushing attachments).
Replace or tighten the pipe plug and slowly open
the inlet isolating valve. After expelling air, the
valve should close and seal tightly.
TROUBLESHOOTING
•Valve Does Not Close / Fluid Leakage
Verify there is at least 10 PSI at the valve
inlet for tight sealing
Verify debris has not collected on the seat
preventing tight closure
Verify rubber small and/or large orifice
seating surfaces are not damaged
Verify float has buoyancy
Verify linkage mechanism operates freely
without binding or sticking
•Valve Does Not Open
Verify debris in the valve is not
preventing the float from freely falling
when fluid is drained from valve
Verify linkage mechanism operates freely
without binding or sticking
Verify pressure at valve inlet does not
exceed 150 PSI
DISASSEMBLY
While small valves may be more easily serviced
by removing it from the line, all valves can be
serviced while the body remains connected to
the pipeline. A skilled technician with proper
tools should perform all work. No special tools
are required.
2

4
Disassemble the valve only as far as needed to
replace damaged or worn parts.
First ensure there is no pressure within the
valve. Refer to Pages 5 and 6 for parts location
and identification.
Remove the cover bolts (9) and lift off cover (2)
with float and linkage attached. It may be
necessary to pry the cover off. Be careful not to
damage or lose the cover O-ring (6).
Remove the spring pin (16) to free the lever arm
(13) from the cage (3). Remove the cage bolts
(17) and lift cage from cover. Unscrew the seat
(4) from the cage and remove the plug (5) and
bushing (12). Note: Bushing only used in 6”
valves or smaller valves with ductile iron cage.
Remove the cage O-ring (7) and renewable seat
(8) from the seat.
If necessary, remove upper (10) and lower (11)
plug extensions. The extensions are secured to
the plug with Loctite so it may be necessary to
apply heat to remove them.
Remove spring pins (16) from universal
coupling.
The float ball (12) is removed by loosening the
hex nut (28) and unscrewing the float ball (21)
by hand being careful not to lose the lock
washer (20). It may be necessary to apply some
heat in order to unscrew the float.
Remove the float hood (23) by removing the cap
screw (22) and lock washer (25).
Inspect all parts for wear and damage. Minor
scratches and dents in the float are normal.
Replace the float if water is detected inside of it.
Replace damaged parts.
REASSEMBLY
Clean all parts especially seating and sealing
surfaces before reassembling valve. Worn parts
should be replaced during re-assembly.
Install bushing (12) and plug (5) in seat (4),
lubricate and install renewable seat (8) in seat
(4). Screw seat (4) into cage ensuring
renewable seat remains in place. Install cage O-
ring (7), position cage on cover and install cage
bolts (27) and tighten.
Sizes 3”and 4”:
Thread orifice button (17) all the way into
lever arm (13) and install hex nut (18) and
lock washer (19) but do not tighten.
Connect the lever arm (7) to the cage (3)
using spring pin (21).
Adjust orifice button (17) so that the end of
the lever arm (13) nearest the orifice button
is about 1/16” farther from the cover than the
opposite end when the orifice button (17) is
gently resting on the plug (5) with the plug
fully seated. Secure by tightening hex nut
(18).
Install hex nut (20) and lock washer (24)
onto end of float rod (10). Apply Loctite 263
to the threads on the float rod (10) and
screw float ball (12) onto float rod (10).
Tighten hex nut (20).
Size 6”:
Place orifice seal (17) on lever arm (13) and
install orifice seal screws (28), lock washers
(18) and hex nuts (19).Tighten but do not
deform orifice seal (17). No adjustment is
required.
Apply Loctite 263 to threads on float rod (14)
and screw float ball (21) tightly onto float rod
(14) by hand.
Apply Loctite 380 to cap screw threads (22).
Install lock washer (20) onto cap screw (22) and
insert through center hole in float hood (23),
screw onto float ball (21) and tighten.
Install spring pins (16) in universal coupling (15)
to attach the float rod (14) to the lever arm (13)
Position lever arm (14) and install spring pin (16)
to attach lever arm to the cage.
Verify free movement of linkage mechanism and
that the orifice button or seal (17) presses
against the plug (5) when the float rises and
pulls away when allowed to fall.
Lubricate and place O-ring (6) in cover (2) and
carefully place cover (2) on body (1) ensuring O-
ring is retained. Install the cover bolts (9) and
tighten in an alternating pattern.
Carefully introduce pressure and check for
leaks.

5
BACKFLUSHING INSTRUCTIONS
Follow all local cross-connection and safety
codes and regulations!
To determine if a GA Industries sewage air valve
needs cleaning or backflushing:
•Close the inlet isolating valve then slowly
open the ½” flushing ball valve (if installed)
or slowly remove the pipe plug at the top
of air valve to relieve internal pressure.
•Open the 1” blow off ball valve (if installed)
or remove the pipe plug near the bottom.
Liquid should freely drain from the valve
body. If it does not, then the valve is likely
in need of cleaning or backflushing.
To clean a GA Industries sewage air release
valve equipped with backflushing attachments:
•Close the inlet isolating valve and then
slowly open the ½” flushing valve to
relieve internal pressure.
•Open the 1” blow off valve
•Connect the ½” flushing valve to a
pressurized source of clean water using
the rubber hose provided with the
backflushing attachments.
•Introduce flushing water until liquid runs
freely from the blow off valve.
•Shut off and disconnect the supply of
clean water and close the blow off and
flushing valves.
•Slowly open the inlet isolating valve. The
air release valve should exhaust air and
then close tightly
REPLACEMENT PARTS
Genuine replacement parts are available from
your local VAG/GA Industries representative or
from the factory:
VAG USA, LLC
234 Clay Avenue
Mars, PA 16046 USA
Telephone: [phone]
Fax: [phone]
E-mail: [e-mail]
Pease have the nameplate data available when
ordering parts
REPAIR KITS
3”Soft Goods Kit A942-3, Part Number 2-80-
11000-025
4”Soft Goods Kit A942-4, Part Number. 2-80-
11000-026
6”Soft Goods Kit A942-6, Part Number 2-80-
11000-027
Soft Goods Kit contains Items 6, 7, 8, 17, 18 &
19
3”Linkage Kit AL942-3, Part Number 2-80-
11000-093
4”Linkage Kit AL942-4, Part Number 2-80-
11000-094
6”Linkage Kit AL942-6, Part Number 2-80-
11000-095
Linkage Kit contains Items 13, 14, 15 and 16,
All other items ordered individually.
WARRANTY
The Warranty for GA Industries valves is
included in our Terms and Conditions which can
be found here: https://gaindustries.com/terms

6
3”and 4”FIGURE 942 PARTS LIST
1. Body
2. Cover
3. Cage
4. Seat
5. Plug
6. Cover O-ring
7. Renewable Seat
8. Cage O-ring
9. Cover Bolt
10. Upper Plug Extension
11. Lower Plug Extension
12. Bushing
13. Lever Arm
14. Float Rod
15. Universal Coupling
16. Spring Pin
17. Orifice Button
18. Lock Washer
19. Hex Nut
20. Lock Washer
21. Float Ball
22. Cap Screw
23. Float Hood
24. ½” Pipe Plug
25. 1” Pipe Plug
26. 2” Pipe Plug
27. Cage Bolt
28. Hex Nut
6”FIGURE 942 PARTS LIST
1. Body
2. Cover
3. Cage
4. Seat
5. Plug
6. Cover O-ring
7. Cage O-ring
8. Renewable Seat
9. Cover Bolt
10. Upper Plug Extension
11. Lower Plug Extension
12. Bushing
13. Lever Arm
14. Float Rod
15. Universal Coupling
16. Spring Pin
17. Orifice Seal
18. Lock Washer
19. Hex Nut
20. Lock Washer
21. Float Ball
22. Cap Screw
23. Float Hood
24. ½” Pipe Plug
25. 1” Pipe Plug
26. 2” Pipe Plug
27. Cage Bolts
28. Orifice Seal Screws