Product Overview
D
B
E
A
A
A
D
B
E
A
A
D
B
E
A
F
G
F
B
A
D
E
F F
A
D
B
E
F
A
G
F
B
A
D
E
T
max
250ϒF
P
max 150 psi
T
max
220ϒF
P
max 150 psi
BI-DIRECTIONAL
38466.01
T
max
250ϒF
P
max 150 psi
T
max
220ϒF
P
max 150 psi
BI-DIRECTIONAL
38466.01
A
A
D
E
C C C
C C
C C
B
G
D
B
E
A
A
A
D
B
E
A
A
D
B
E
A
F
F J
C
B
A
H
D
E
F F
A
D
B
E
F
A
F
T
max
250ϒF
P
max 150 psi
T
max
220ϒF
P
max 150 psi
BI-DIRECTIONAL
38466.01
A
A
D
E
C C C
C C
G
B
G
WALL
Max amount in gallons of dissolved air per 100 gallons of water
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
15 psi
30 psi
45 psi 60 psi 75 psi 90 psi 105 psi 120 psi
Absolute pressure
Water temperature
32 65 100 135 170 205 240 275 310 345
D
B
E
A
A
A
D
B
E
A
A
D
B
E
A
F
G
F
B
A
D
E
F F
A
D
B
E
F
A
G
F
B
A
D
E
T
max
250ϒF
P
max 150 psi
T
max
220ϒF
P
max 150 psi
BI-DIRECTIONAL
38466.01
T
max
250ϒF
P
max 150 psi
T
max
220ϒF
P
max 150 psi
BI-DIRECTIONAL
38466.01
A
A
D
E
C C C
C C
C C
B
G
** Add prefix NA to flanged code number when ordering ASME tagged and registered with the
National Board of boiler and Pressure Vessel Inspector and CRN registered.
†
This dimension allows for a minimum of 3" wall clearance to accommodate insulation if used.
* Add suffix C to sweat and NPT code number when ordering the brass
DISCAL
®
to ship with expansion tank service check valve, code561402A.
* Add suffix C to sweat and NPT code number when ordering the brass
DISCAL
®
to ship with expansion tank service check valve, code561402A.
Dimensions
The process of air formation
The amount of air which can remain dissolved in a water solution is a
function of pressure and temperature.
This relationship is governed by Henry’s Law and the graph to the right
demonstrates the physical phenomenon of the air release from water.
As an example, at a constant absolute pressure of 30 psi (2 bar), if
the water is heated from 65ºF (18ºC) to 170ºF (75ºC), the amount of air
released by the solution is equal to 1.8 gallons of air per 100 gallons
ofwater.
According to this law it can be seen that the amount of air released
increases with temperature rise and pressure reduction. The air comes
in the form of micro-bubbles of diameters in the order of tenths of
amillimeter.
In heating and cooling systems there are specific points where this
process of formation of micro-bubbles takes place continuously: in the
boiler and in any device which operates under conditions of cavitation.
Code A B C D E F Wt (lb)
551003A*
3
⁄4" 3
1
⁄16" 2
3
⁄16" 5
3
⁄8" 6
7
⁄8"
1
⁄2" 2.0
551022A*
3
⁄4" SWT 3
1
⁄16" 2
3
⁄16" 5
3
⁄8" 6
7
⁄8"
1
⁄2" 2.0
NA551995
3
⁄4" 5
1
⁄16" 2
3
⁄16" NA 9
3
⁄16"
1
⁄2" 4.5
NA551996 1" 6
1
⁄16" 2
3
⁄16" NA 9
9
⁄16"
1
⁄2" 4.5
Code A B C D E F G H J
†
Wt (lb)
**551050A 2" 13
3
⁄4" 1" 14
3
⁄4" 19
15
⁄16" 6
5
⁄8" 2
13
⁄16" 6" 6
5
⁄16" 34
**551060A 2
1
⁄2" 13
3
⁄4" 1" 14
3
⁄4" 19
15
⁄16" 6
5
⁄8" 2
13
⁄16" 7" 6
5
⁄16" 35
**551080A 3" 18
3
⁄8" 1" 17
1
⁄8" 23
7
⁄16" 8
5
⁄8" 2
13
⁄16" 7
1
⁄2" 7
5
⁄16" 62
**551100A 4" 18
1
⁄2" 1" 17
1
⁄8" 23
7
⁄16" 8
5
⁄8" 2
13
⁄16" 9" 7
5
⁄16" 67
NA551120A 5" 25" 1" 21
7
⁄16" 30
1
⁄2" 12
3
⁄4" 2
13
⁄16" 10" 9
3
⁄8" 106
NA551150A 6" 25" 1" 21
7
⁄16" 30
1
⁄2" 12
3
⁄4" 2
13
⁄16" 10" 9
3
⁄8" 117
Size 2" 2
1
⁄2" 3" 4" 5" 6"
Cap. (Gal) 1.8 1.8 4.8 4.8 13.7 13.7
Code A B C D E F Wt (lb)
551005A*
3
⁄4" 4
5
⁄16" 2
3
⁄16" 5
3
⁄4" 7
1
⁄2"
1
⁄2" 3.7
551006A* 1" 4
5
⁄16" 2
3
⁄16" 5
3
⁄4" 7
1
⁄2"
1
⁄2" 3.7
551007A* 1
1
⁄4" 4
7
⁄8" 2
3
⁄16" 6
9
⁄16" 8
1
⁄4"
1
⁄2" 4.9
551008A* 1
1
⁄2" 4
7
⁄8" 2
3
⁄16" 6
9
⁄16" 8
1
⁄4"
1
⁄2" 4.9
551009A* 2" 5
1
⁄8" 2
3
⁄16" 6
9
⁄16" 8
1
⁄4"
1
⁄2" 5.5
551028A* 1" SWT 5
1
⁄16" 2
3
⁄16" 5
3
⁄4" 7
1
⁄2"
1
⁄2" 3.7
551035A* 1
1
⁄4" SWT 5
3
⁄16" 2
3
⁄16" 6
5
⁄16" 8
1
⁄4"
1
⁄2" 3.7
551041A* 1
1
⁄2" SWT 5
3
⁄4" 2
3
⁄16" 6
9
⁄16" 8
1
⁄4"
1
⁄2" 4.9
551054A* 2" SWT 6
1
⁄8" 2
3
⁄16" 6
9
⁄16" 8
1
⁄4"
1
⁄2" 5.5