DFT Vacuum Breakers From Durabla

Durabla Vacuum Breaker
Two Durabla Vacuum Breakers
used in a "dry can".

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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.
Durabla Vacuum Breaker Diagram

 

DFT Vacuum Breaker Features

1" to 4" Size 450 to 6000 CWP Threaded O.D. (MNPT)
Unthreaded Inlet Bore Stainless Steel Construction Versatile
Tight Shut-Off Soft Seat Option Easy Maintenance
Horizontal or Vertical Installation Spring Assisted Silent Closing


 

 
Technical Information
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
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
4" 2-7/32" 90 16 0.15 4.3 7.00

 * - Cracking pressure for vertical flow will be slightly different: upward flow, slightly higher; downward flow, slightly less.

 (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
1" 2500 8103 (Light Spring)(2)
1-1/2" 2000 8034
2" 1500 8035
2-1/2" 850 8036
3" 700 8037
4" 450 8038
BSSV6 1 6000 8094
1-1/2 5500 8095
2 3000 8096
2-1/2 1100 8097
3 900 8098
4 450 8099

(2) 0.24 PSI Crack Pressure Spring (+/- 10%)



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