Vag GA Industries 930-DT User manual

INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
Figures 930-T, 930-DT, 930-UT
½” to 4” Air & Vacuum Valves
for Clean Water
Drawings EAV-7051, EAV-7052, EAV-7053
234 Clay Avenue • Mars, PA 16046 USA
Telephone [phone] • Fax [phone]
E-mail: [e-mail]
Manual Number 931.1-IOM 120220

1
INSTALLATION, OPERATION and
MAINTENANCE
Figure 930 Air & Vacuum Valves
INTRODUCTION
This manual will provide the information to
properly install, operate and maintain the valve
to ensure a long service life. The Figure 930 Air
& Vacuum Valve is ruggedly constructed to
provide years of trouble-free operation with
minimal maintenance.
These Air & Vacuum Valves are not intended for
use with fluids containing suspended solids such
as wastewater and sewage. The GA Industries
Figure 935 or 939 Sewage Service Air &
Vacuum Valves are recommended for such
applications.
CAUTION
The valve is NOT recommended for use with
toxic fluids, fuels or fluids containing hazardous
gases
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 930 allows air that is being pushed
ahead of the incoming fluid to escape and
ensure a complete filling of the pipeline or
vessel. Once the air has been exhausted and
the system is pressurized the valve closes tight.
It does not re-open unless and until the system
is drained and/or a negative pressure condition
occurs within the pipe or vessel in order to admit
air to minimize the vacuum condition.
The Figure 930 employs the Kinetic aero-
dynamic operating principle designed to ensure
the valve is not prematurely blown shut by the
high velocity exiting air.
RECEIVING AND STORAGE
Inspect the valve upon receipt for damage
during shipment. Carefully unload all valves to
the ground without dropping. Do not pick up the
valve by the “cowl.”
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
The Figure 930 is standard with NPT inlet and
outlet connections in sizes ½” to 3” while the 4”
is standard with ANSI Class 125 or 250 flanged
inlet and NPT outlet. The inlet and outlet
connections are the same size. 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. Some discharge of water
may occur just prior to valve closure. If installed
indoors or in a vault, the valve outlet should be
directed to an adequate drain.
An isolating valve should be installed between
the valve and the pipeline or system to facilitate
maintenance.
Carefully screw threaded end valves onto pipe
nipple using compatible thread sealant. Tighten
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 using slings or chains
around the valve body and/or the lifting eye.
Lubricate the bolts or studs and insert around
flange. Lightly tighten bolts until gaps are

3
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 930 Air & Vacuum Valve
has a cast iron body and cover, a 316 stainless
steel float ball and Buna-N rubber seat. Refer
to the List of Materials submitted for the order if
non-standard materials were provided.
Refer to Figure 1 or 2 on Page 3 for details of
construction and parts location.
All Figure 930 Air & Vacuum Valves have a 10
PSI minimum working pressure. Maximum
working pressure for Figure 930-DT Class 125
flanged inlet valves is 150 PSI. Figure 930-T
NPT inlet and Figure 930-UT Class 250 flanged
inlet valves have a 300 PSI maximum working
pressure.
The body (1) has an inlet connection at the
bottom where the valve attaches to the system
and an outlet connection at the top through
which air leaves the valve (during filling) and
enters the valve (during draining). The outlet
may be fitted with a “cowl” to deflect air during
venting and minimize entry of foreign matter
during air admission.
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 930 Air & Vacuum Valves require no
scheduled lubrication, adjustment or preventive
maintenance.
The float ball with attached float guide are the
only moving parts and require no lubrication.
A periodic visual inspection should be performed
to ensure the outlet piping is not obstructed and
to verify there is no fluid leakage.
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 ball or gate
valve can be installed in place of the pipe plug to
facilitate testing.
Replace or tighten the pipe plug and slowly open
the inlet isolating valve. The valve should float
closed and seat tightly.
TROUBLESHOOTING
•Valve Does Not Close / Fluid Leakage
Verify debris has not collected on the seat
preventing tight closure
Verify there is at least 10 PSI pressure at
the valve inlet
Verify rubber seat and/or float ball seating
surfaces are not deformed or damaged
Verify float guide is undamaged and
attached to float
Verify float has buoyancy
Verify float ball rises freely without
binding or sticking
•Valve Does Not Open
Verify there is no debris in the valve that
is preventing the float from freely falling
when fluid is drained from valve
DISASSEMBLY
Although small a size Figure 930 Air & Vacuum
Valve 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.
First ensure there is no pressure within the
valve. Remove the cover screws (7) and lift off
cover (2), it may be necessary to pry the cover
off.
Remove the rubber seat (3) and lift out the float
ball (5) with float guide (8) attached. Remove
the rubber cushion (9) and flange bearing (10).
Inspect all parts for wear and damage. Minor
scratches in the float are normal. Some floats
may contain sand for added weight but if water
is detected replace the float. Clean any scale
build up from the float ball. Replace damaged
parts.

4
REASSEMBLY
Reassembly is performed in reverse order from
disassembly. Clean all parts especially the
threaded, seating and sealing surfaces before
reassembling valve. Worn or damaged parts
should be replaced.
Carefully introduce pressure and check for leaks
REPAIR KITS
Soft Goods Repair Kits are available and include
Items 3 and 9. Order by kit number or part
number:
½” to 1”Kit A930 Part Number 2-80-11000-011
2”Kit A930-2 Part Number 2-80-11000-014
3”Kit A930-3 Part Number 2-80-11000-015
4”Kit A930-4 Part Number 2-80-11000-016
Other parts are ordered individually.
PARTS LIST
½” to 4” Figure 930
Item Name Standard Material
1. Body Cast Iron
2. Cover Cast Iron
3. Seat Buna-N Rubber
4. Cover Bolts Steel, Zinc Plated
5. Float Ball 316 Stainless Steel
6. Pipe Plug Malleable Iron
7. Cover Nuts Steel, Zinc Plated
8. Float Guide ½”–3”UHMW Polyethylene
4”–Stainless Steel
9. Cushion Buna-N Rubber
10. Bearing Acetal Polymer
Figure 1
NPT Inlet
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: quo[email protected]
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
VAG USA, LLC
234 Clay Avenue •Mars, PA 16046 USA
Phone: [phone] •Fax: [phone]
[e-mail] •
www.gaindustries.com
Figure 2
Flanged Inlet