BULLETIN 600
FEBRUARY 2014
APCO CLEAN WATER
AIR RELEASE VALVES
Model 55
Model 50
Model 200A
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Air Release Valves
Why and Where to Use
An Air Release Valve has a small venting orifice and is used wherever air is entrained in water under
pressure. These pockets of air increase the resistance to the flow of water. In critical installations, air
can reduce the capacity of a line down to zero. More common is an increased resistance of 10 to 15%.
The increased resistance must be overcome by the pump using more power than necessary to move
the required amount of water. Such a loss can continue unnoticed for years creating excessive power
consumption costs. This is a major reason why all points where air can collect should be equipped with
an APCO Air Release Valve.
How to Operate
These valves have much smaller orifices than the Air/Vacuum Valves. Their function is to release small
pockets of air which gather at the high points of a system after it is filled and under pressure. The Air
Release Valve has the ability to open against internal pressure because it has a small orifice and a leverage
mechanism which multiplies the force of the float. This force must be greater than the internal pressure
across the orifice in order to open it when a pocket of air needs to be vented. This explains why, as the
internal pressure increases, the orifice decreases in size to facilitate the valve opening.
Simple Lever
All APCO Air
Release Valves
are 100%
Hydrostatically
factory tested
to ANSI/AWWA
C512 standards.
#50
.5, .75, 1" (15, 20, 25 mm) Inlet
Physical Dimensions
Height - 5.875" (149 mm)
Width - 3.75" (95 mm)
Weight - 6 lbs (3 kg)
Standard pressures up to 175 psi
(1207 kpa) and up to 300 psi (2068 kpa)
with special orifice.
Specify if operating pressure is below
20 psi (138 kpa).
#55
.5" (15 mm) Inlet
Physical Dimensions
Height - 5" (127 mm)
Length - 6.375" (162 mm)
Width - 3.313" (84 mm)
Weight - 5.5 lbs (2.5 kg)
Standard pressures up to
175 psi (1207 kpa).
APCO Uses Stainless Steel
Floats Exclusively
Examine these quality features provided at
no extra cost:
1. ASTM quality materials guaranteed throughout
2. Stainless steel floats
3. Conserve pumping power – eliminate restricted
high points
4. Create maximum pipeline efficiency
#65
.75" (20mm) Inlet
Physical Dimensions
Height - 7" (178 mm)
Length - 8.5" (216 mm)
Width - 4.5" (114 mm)
Weight - 9 lbs (4 kg)
Standard pressures up to
150 psi (1034 kpa).
Materials of Construction
Body and Cover - Cast Iron or Ductile Iron
Float - Stainless Steel
Seat - Bronze-Stainless or Buna-N
Needle - Bronze or Stainless Steel
Linkage - Delrin, Bronze or Stainless Steel
Other internal parts – Lever Pins, Retaining
Rings, and Screws are Stainless Steel
or Bronze.
© 2014 DeZURIK, Inc.
2
Note: Great care is taken in the choice of materials
to avoid galvanic action. Bronze components meet
current lead-free requirments
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Where to Install
Typical pipeline and position of necessary APCO air valves
Hydraulic Gradient
APCO Combination Air Valve
at peaks and sharp change in gradient due to
possibility of column separation and vacuum
APCO Hydraulically Controlled Air/Vacuum Valve
where secondary surges due to rejoining of
previously separated water column could occur
APCO Air Release Valve
on long ascending stretch at
1/4 to 1/2 mile intervals
Pump
APCO Air/Vacuum Valve on pump discharge before check valve (not necessary for pumps with positive suction head)
APCO Hydraulically Controlled Air/Vacuum Valve where a discharge gate valve is normally closed during pump start-up to develop head
Note: Installing manways at intervals in larger size pipelines provides an excellent point to install air valves
or
Datum
APCO Hydraulically Controlled
Air/Vacuum Valve
where secondary surges due to rejoining of
previously separated water column could occur
APCO Combination Air Valve
at peaks and sharp change in gradient due to
possibility of column separation and vacuum
APCO Air Release Valve
on long horizontal and descending
stretch at 1/4 to 1/2 mile intervals
or
line where no significant amount of air is anticipated
APCO Air/Vacuum Valve
at peaks and sharp change in gradient near end of
Compound Lever
or
Also install on:
1. Centrifugal pumps
2. Hydropneumatic tanks
3. Enclosed systems
4. Sewage lines
Reservoir
or
Discharge
Air/Vacuum Valve
Air Release Valve
Combination Air Valve
Hydraulically Controlled
Air/Vacuum Valve
#200A
1", 2" (25, 50 mm) Inlet
Physical Dimensions
Height - 10" (254 mm)
Width - 7" (179 mm)
Weight - 20 lbs (9 kg)
Inlet - 1" or 2"
(25, 51mm)
pipe thread
Standard pressures up to
150 psi (1034 kpa) and up
to 300 psi (2068 kpa) or higher
with special orifice.
Concave float is patented.
Higher pressure classes available.
For selection and sizing of all the above air valves, see the Venting Capacity Graph for Air
Release Valves on the back page of this bulletin or ask for APCO Air Valve Sizing Software.
#200
2" (50 mm) Inlet
Physical Dimensions
Height - 12.5" (318 mm)
Width - 9.5" (241 mm)
Weight - 45 lbs (20 kg)
Inlet - 2" (51mm)
pipe thread
Standard pressures up to
150 psi (1034 kpa) and up
to 300 psi (2068 kpa) or higher
with special orifice.
#205
2" (50 mm) Inlet
Physical Dimensions
Height - 13" (330 mm)
Width - 12" (305 mm)
Weight - 75 lbs (34 kg)
Inlet - 2" (51mm)
pipe thread
Flanged inlet available
150 or 300 lb. class
Standard pressures up to
500 psi (3447 kpa) and up
to 1500 psi (10342 kpa) with
special orifice.
Manufactured to AWWA C-512
ISO connections available
#207
6" (150 mm) Inlet
Physical Dimensions
Height - 28" (711 mm)
Width - 13.5" (343 mm)
Weight - 200 lbs (91 kg)
Inlet - 6" (152 mm)
125# flange
Discharge orifice - 1"
(25mm) diameter
HIGH VENTING CAPACITY
Standard pressures up to
150 psi (1034 kpa) and up
to 300 psi (2068 kpa) with
special orifice.
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3
Selection
How to select and size an
air release valve when a
specific venting capacity is
required:
1500
1000
500
Ve nti ng Capacity Graph for Air Release Valves
Orifice Sizes
A. Enter graph with pressure
in system and venting
capacity required.
B. Read off nearest orifice
diameter to intersection
of pressure and capacity
lines on graph.
C. Enter table below with
orifice diameter and
select valve which can
use this orifice diameter
at the pressure involved.
Standard orifices on chart are shaded gray
Model Inlet size
.5", .75", 1"
50
15, 20, 25
55
65
200A
200
205
206
207
400
450
.5"
15
.75"
20
1", 2"
25, 50
2"
50
2"
50
2"
50
6"
150
2", 3", 4"
50, 80, 100
2", 3", 4"
50, 80, 100
10
69
.094"
2
.094"
2
.219"
6
.313"
8
.5"
13
— — — —
— — — — — — — — — — — —
1"
25
.313"
8
.5"
13
Maximum orifice sizes which can be used with the following pressures - psi/kpa
25
172
.094"
2
.094"
2
.219"
6
.313"
8
.5"
13
1"
25
.313"
8
.5"
13
200
150
100
50
20
10
5
2
Pressure Di fferential Across Valve in psi
1
50
345
.094"
2
.094"
2
.219"
6
.313"
8
.5"
13
1"
25
.313"
8
.5"
13
Ve nti ng Capacity in Cubic Feet of Free Air Per Minute
75
517
.094"
2
.094"
2
.219"
6
.25"
6
.5"
13
1"
25
.25"
6
.5"
13
100
689
.094"
2
.094"
2
.125"
3
.188"
5
.375"
10
.5"
13
1"
25
.25"
6
.5"
13
125
862
.094"
2
.094"
2
.125"
3
.188"
5
.375"
10
.375"
10
1"
25
.25"
6
.5"
13
150
1034
.094"
2
.094"
2
.125"
3
.188"
5
.375"
10
.375"
10
1"
25
.25"
6
.5"
13
200
1379
— — — — — —
— — — — — —
.156"
4
.219"
6
.219"
6
.75"
19
.188"
5
.438"
11
250
1724
.156"
4
.219"
6
.219"
6
.75"
19
.156"
4
.438"
11
300
2068
.156"
4
.219"
6
.219"
6
.75"
19
.156"
4
.438"
11
500
3447
— — —
— — —
— — —
.219"6.125"
— — —
— — —
— — —
800
5516
3
1500
10342
—
.094"
2
Inch
Millimeter
Sewage Air Release Valves
Please see Bulletin 400, “APCO Sewage Air Valves Generation II”
Sales and Service
For information about our worldwide locations, approvals, certifications and local representative:
Web Site: www.dezurik.com E-Mail: info@dezurik.com
250 Riverside Ave. N. Sartell, Minnesota 56377 • Phone: 320-259-2000 • Fax: 320-259-2227
DeZURIK, Inc. reserves the right to incorporate our latest design and material changes without notice or obligation.
Design features, materials of construction and dimensional data, as described in this bulletin, are provided for your information only
and should not be relied upon unless confirmed in writing by DeZURIK, Inc. Certified drawings are available upon request.
Printed in the U.S.A.
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