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DFT Durabla Vacuum Breakers
provide effective protection
against collapse of pressure vessels, tanks
and rolls.
They Prefent condensate "back-up" when
equipment is
shut down or inlet steam is reduced by
modulating
control valves. In piping systems, DFT
Durabla
Vacuum Breakers
are used to break siphons, prevent pipe
collapse during
transient pressure drops, and to provide
addition of air
on the downstream side of check valves to
dampen
water hammer. |
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DFT Vacuum
Breaker Features |
| 1" to 4"
Size |
450 to 6000 CWP |
Threaded
O.D. (MNPT) |
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Unthreaded Inlet Bore |
Stainless Steel Construction |
Versatile |
| Tight
Shut-Off |
Soft Seat Option |
Easy
Maintenance |
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Horizontal or Vertical Installation |
Spring Assisted Silent Closing |
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Technical Information |
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Durabla
Vacuum Breaker |
CV |
Friction Loss
(Feet of Pipe) |
Valve Cracking Pressure* |
Approx.
Net WT.
Each (In lbs.) |
Nominal Size
(MNPT)
A |
Unthreaded
Inlet Bore
B |
(PSI) |
(Inches of Water) |
| 1" |
9/16" |
5.8 |
7 |
0.60(1) |
16.7 |
0.38 |
|
1-1/2" |
7/8" |
13.2 |
6 |
0.45 |
12.5 |
0.88 |
| 2" |
1-3/32" |
23.1 |
7 |
0.38 |
10.5 |
1.25 |
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2-1/2" |
1-1/2" |
36 |
12.5 |
0.20 |
5.5 |
2.25 |
| 3" |
1-23/32" |
57.4 |
11 |
0.14 |
3.9 |
3.75 |
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4" |
2-7/32" |
90 |
16 |
0.15 |
4.3 |
7.00 |
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* - Cracking
pressure for vertical flow will be
slightly different: upward flow,
slightly higher; downward flow, slightly
less. |
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(1) - Light spring
available: Cracking Pressure = .18 PSI
(5.0 inches of water) |
VACUUM BREAKER
SIZE |
SIZE |
COLD, NON-STOCK PRESSURE RATING (2) |
PRODUCT
CODE |
|
BSSV |
1" |
2500 |
8033 |
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1" |
2500 |
8103 (Light Spring)(2) |
| 1-1/2" |
2000 |
8034 |
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2" |
1500 |
8035 |
| 2-1/2" |
850 |
8036 |
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3" |
700 |
8037 |
| 4" |
450 |
8038 |
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BSSV6 |
1 |
6000 |
8094 |
| 1-1/2 |
5500 |
8095 |
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2 |
3000 |
8096 |
| 2-1/2 |
1100 |
8097 |
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3 |
900 |
8098 |
| 4 |
450 |
8099 |
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(2) 0.24 PSI
Crack Pressure Spring (+/- 10%) |
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