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
