Sewage Air Release Valve - Series 400 & 450
Series 400 and 450 APCO Sewage Air Release
Valves are specially designed for use with sewage
and waste media.
The concave float, stem and body keep the
valve venting mechanism as free from contact
with sewage as possible. The float hangs freely
in the center of the valve body and responds
instantaneously to the fall and rise of the sewage
media due to the concave float.
How It Works
When sewage enters the valve, it rises, forcing
air out ahead of it. Then as sewage reaches the
concave float, it raises the float and float stem
instantly, due to the very sensitive impact zone.
This fast action closes the venting mechanism,
trapping the remaining air in the valve body. This
entrapped air is initially at atmospheric pressure but
it’s compressed after the venting mechanism closes.
The sewage continues rising in the valve, until air
and sewage are at the same pressure. The sewage
then stops rising, leaving the venting mechanism
free from contamination.
N
o
w
30%
S
h
o
r
t
e
r
Venting
Mechanism
Shutoff
Valve
Shown 90°
Out of
Position
Body
Stem
Concave
Float
Backflushing
Attachments
Optional
Additional gases given off by the sewage rise into
the valve body, displacing and lowering the sewage
level until the float drops, opening the venting
mechanism allowing gases to escape. Sewage
again rises to occupy the space vacated by the
escaped gas, lifts the float and closes the venting
mechanism. This cycle is repeated frequently as
air and gas collect in the valve without spillage
or spurting, due to the sensitivity of the patented
concave float.
Optional
Blowoff
Valve
Optional
Inlet
Valve
8
www.dezurik.com
Dimensions and Specifications
Series 400 & 450 Sewage Air Release Valves
Model
Inch
Millimeter
400
450
Size Height
Inlet Outlet Valve w/Attach. Plain w/Attach.
2" NPT
Pounds
Kilograms
50
3" NPT
80
4" NPT
100
2" NPT
50
3" NPT
80
4" NPT
100
.5" NPT1317.5"
1" NPT
25
445
20"
508
23.5"
597
26.5"
673
*Orifice diameter is determined by pressure, not by size.
Major
Dia.
7.5"
191
9.5"
241
Operating
Pressure
psi/kpa
0-50
0-345
0-150
0-1034
0-300
0-2068
0-150
0-1034
0-300
0-2068
Orifice
Dia.*
.313"
8
.25 STD
6
.156"
4
.5" STD
13
.438"
11
Venting
Capacity
CFFAM
55
90
25
350
520
41
19
85
39
Weight
55
25
118
54
Specify APCO With Confidence
Sewage Air Release Valve Models 400 & 450
Sewage Air Release Valves shall have an elongated body and be designed to operate (open) while pressurized
allowing entrained air in a sewage force main line, sewage pump or waste water system to escape through
the air release orifice without spillage or spurting. After entrained air escapes through the air release orifice,
the valve orifice shall be closed by a needle mounted on a compound lever mechanism, (energized by a
concave float) and prevent media from escaping. The air release orifice will then remain closed until more
air accumulates and the opening cycle repeats automatically. The internal compound lever mechanism shall
be stainless steel to prevent corrosion. Optional: Inlet and blow off valves, quick disconnect couplings and
minimum 5’ (1.5m) hose for flushing. Engineer to specify.
The internal linkage shall be fitted with a stem, having a stainless steel concave float threaded onto the
opposite end. The concave float shall hang inside the valve body, slightly above the inlet and maintain an
air gap between the lever mechanism and the waste media. The valve body and float shall withstand 500
psi (3447kpa) shell test pressure. The valve inlet shall be 2", 3", 4" NPT (50, 80, 100mm) Model 400 or 450.
Engineer to specify.
Materials of construction shall be certified the following ASTM specifications:
Body & Cover Cast Iron ASTM A126 GR.B
Ductile Iron ASTM A536 GR 65-45-12
Internal Linkage, Stem Stainless Steel Series T300
Patented Concave Float Stainless Steel ASTM A240 T304
Needle Buna-N Nitrile Rubber
Exterior Paint Universal Metal Primer FDA Approved for Potable Water
www.dezurik.com
9
Loading...