Armstrong 21AR Installation et maintenance - Page 3
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An unusual increase in system pressure may cause the
air vent to lock shut.
the
one that can handle the peak pressures.
Vent
Fails
3 .
Dirt may be lodged in the orifice.
a.
the mechanism, the body, and the cap.
b.
The valve and seat may be worn.
mechanism.
c .
There may be a leak in the float.
and shake it close to your ear.
inside you will be able to hear it sloshing.
the
An
d.
collapsed.
For help with unusual installations or service problems, contact
your
Armstrong
Applications
Engineering
PLACEMENT OF LEVERAGE SYSTEM
1 .
Make sure the parts you have received are for the correct
orifice
size
for example) is stamped on the valve seat.
2 .
Remove the air vent cap and place it in a vise with the
mechanism up.
3 .
Disassemble the float and lever mechanism by removing the
valve lever pin and the valve seat.
4 .
Clean all dirt, pipe scale, and foreign materials from the
cap,
especially
5 .
Place the valve seat through the hole in the valve lever
clip and tighten both parts into the air vent cap.
valve
seat is tightened,
symmetrical with respect to the gasket surfaces to the left
and right of it and with respect to the centerline of the
The ears for the valve lever pin should be on the side
cap.
of the valve seat closest to the gasket surface (away from
the center of the cap).
DO
NOT use pipe dope or lubricant on the valve seat threads.
seal is made, not by the threads, but by metal to metal contact
at the ground end of the valve seat.
in the cap is clean before screwing the valve seat into position.
6 .
Use the valve lever pin to assemble the valve lever to the
valve
lever
between the ears of the valve lever clip.
ARMSTRONG
increased
pressure
to
Close
Tightly
float.
unlikely
possibility
Replace
Representative
Department.
for
your
from
the
clip.
The ears of the valve lever fit in
21AR
AND
21-312AR
Either eliminate the cause of
or
replace
(Leaks
Water).
is
that
the
float.
or
the
Armstrong
FOR NO. 21-AR.NO.
operating
pressure.
threaded
holes.
the lever
Make sure the seating area
3
AIR
VENTS
the
mechanism
Clean
the
Replace the whole
Disconnect
the
If liquid has leaked
Replace
the
float
Machine
The orifice size
When
clip should be
with
orifice,
float
has
Works
the
The