4
(3). The float and linkage will be free from the
cover.
Remove the spring pins (13) connecting the
valve links (14) to the float arm (12). Remove
the spring pin (13) from the pivot link (15) and
the hex nut (8) and lock washer (9). Unscrew the
float rod (21) from the float ball (20). It may be
necessary to apply some heat to these threaded
connections as they are secured with Loctite.
Remove the hex nut (8) and lock washer (9) and
unscrew the orifice button (7) from the lever arm
(11).
Remove the bracket screw (5) to remove the
leverage bracket (3). Using a hex socket
remove the orifice (4) from the cover.
Inspect all parts for wear and damage. Minor
scratches and dents in the float are normal.
Some floats may contain sand for added weight
but if water is detected replace the float.
Carefully clean the orifice of scale. Replace
damaged parts.
REASSEMBLY
Clean all parts especially seating and sealing
surfaces before reassembling valve. Worn parts
should be replaced during re-assembly.
Apply Loctite
©
PST thread sealant to orifice (4)
and thread into cover. Torque to 22 ft-lbs
(maximum).
Install bracket (3), bracket screws (5) and lock
washers (6) and tighten.
Thread orifice button (7) all the way into lever
arm (11) and install hex nut (8) and lock washer
(9) but do not tighten. Connect the lever arm
(11) and float arm (12) to the bracket (3) using
two spring pins (13).
Adjust the orifice button (7) so that the end of
the lever arm (11) nearest the orifice button is
about 1/16” (1.6mm) farther from the cover than
the opposite end when the orifice button (7) is
gently resting on the orifice (4). Secure by
tightening hex nut (8).
Install valve links (14) and spring pins (13) to
connect the float arm (12) to the lever arm (11).
Apply Loctite 263 to one end of float rod threads
and Install lock washer (9) and float rod (21) into
float ball (20) and tighten. Apply Loctite 263 to
the threads on the other end of float rod. Install
pivot link (15), lock washer (9) and hex nut (8)
on opposite end of float rod (19) and tighten.
Attach pivot link (15) to float arm (12) using
spring pin (13).
Verify free movement of linkage mechanism and
that the orifice button (7) presses against the
orifice (4) when the float rises and pulls away
when allowed to fall.
Lubricate and place O-ring (10) in cover (2) and
carefully place cover (2) on body (1) ensuring o-
ring is retained. Install the cover bolts (16) and
tighten in an alternating pattern.
Carefully introduce pressure and check for
leaks.
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
