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INSTALLATION, OPERATION and
Figure 905 Air Release Valves
INTRODUCTION
This manual will provide the information to
properly install, operate and maintain the valve
to ensure a long service life. The Figure 905 Air
Release Valve is ruggedly constructed to
provide years of trouble-free operation with
minimal maintenance.
These Air Release Valves are not intended for
use with fluids containing suspended solids such
as wastewater and sewage. The GA Industries
Figure 925, 927 or 929 Air Release Valves are
recommended for such applications.
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 905 Air Release Valve is designed to
automatically vent air that has accumulated
within the valve.
These valves are usually
installed at high points in the system where air
tends to collect. The valve is "normally open" as
shipped and will vent air through its orifice at the
top of the valve.
The float rises when water
enters the valve and closes the orifice. Air from
the system accumulates in the valve forcing the
water level down until the float drops and opens
the venting orifice. As air is released the water
level rises lifting the float and re-closing the
valve.
This sequence occurs as often as necessary to
release air that has collected in the valve.
MAINTENANCE
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
The Figure 905 is standard with NPT screwed
connections. 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 during operation so the valve outlet
should be piped 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.
TIGHTEN.
VALVE CONSTRUCTION
The standard Figure 905 Air Release Valve has
a cast iron body, stainless steel float and linkage
mechanism and a rubber seat and is suitable for
use at working pressures from 10 to 150 PSI (69
to 1,034 kPa). If there is an "H" suffixed to the
figure number (e.g., 905H) the valve is suitable
for use at up to 200 PSI (1,379 kPa) working
pressure.
Refer to the List of Materials
DO NOT OVER-
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