DFT® Vacuum Breakers provide effective protection against collapse of pressure vessels, tanks and rolls. They prevent condensate "back-up" when equipment is shut down or inlet steam is reduced by modulating control valves. In piping systems, DFT® 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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Style

Size (in)

Size (mm)

ENDS

ASME CWP

Cv

Prod. #

Style

Size

Nominal Size (MNPT) A

Unthreaded Inlet Bore B

Valve Cracking Pressure

Cold Working Pressure

ENDS

Cv

N/A BSSV N/A 1.00 inDN 25 N/A 1.00 in N/A 0.56 in14 mm N/A 0.60 psi16.7 in.water424 mm.water31.1 mmHg0.041 bar N/A 0 psig2500 psig0 barg172 barg N/A NPT N/A 5.8
N/A BSSV N/A 1.00 inDN 25 N/A 1.00 in N/A 0.56 in14 mm N/A 0.24 psi6.6 in.water167 mm.water12.4 mmHg0.017 bar N/A 0 psig2500 psig0 barg172 barg N/A NPT N/A 5.8
N/A BSSV N/A 1.50 inDN 40 N/A 1.50 in N/A 0.88 in22 mm N/A 0.44 psi12.1 in.water307 mm.water22.6 mmHg0.03 bar N/A 0 psig2000 psig0 barg138 barg N/A NPT N/A 13.2
N/A BSSV N/A 2.00 inDN 50 N/A 2.00 in N/A 1.09 in28 mm N/A 0.36 psi10.1 in.water257 mm.water18.8 mmHg0.025 bar N/A 0 psig1500 psig0 barg103 barg N/A NPT N/A 23.1
N/A BSSV N/A 2.50 inDN 65 N/A 2.50 in N/A 1.50 in38 mm N/A 0.16 psi4.5 in.water114 mm.water8.4 mmHg0.011 bar N/A 0 psig850 psig0 barg58.6 barg N/A NPT N/A 36
N/A BSSV N/A 3.00 inDN 80 N/A 3.00 in N/A 1.72 in44 mm N/A 0.15 psi4.2 in.water107 mm.water7.8 mmHg0.01 bar N/A 0 psig700 psig0 barg48.3 barg N/A NPT N/A 57.4
N/A BSSV N/A 4.00 inDN 100 N/A 4.00 in N/A 2.22 in56 mm N/A 0.10 psi2.6 in.water66 mm.water4.8 mmHg0.007 bar N/A 0 psig450 psig0 barg31.0 barg N/A NPT N/A 90
N/A BSSV6 N/A 1.00 inDN 25 N/A 1.00 in N/A 0.56 in14 mm N/A 0.60 psi16.7 in.water424 mm.water31.1 mmHg0.041 bar N/A 0 psig6000 psig0 barg414 barg N/A NPT N/A 5.8
N/A BSSV6 N/A 1.50 inDN 40 N/A 1.50 in N/A 0.88 in22 mm N/A 0.44 psi12.1 in.water307 mm.water22.6 mmHg0.03 bar N/A 0 psig5500 psig0 barg379 barg N/A NPT N/A 13.2
N/A BSSV6 N/A 2.00 inDN 50 N/A 2.00 in N/A 1.09 in28 mm N/A 0.36 psi10.1 in.water257 mm.water18.8 mmHg0.025 bar N/A 0 psig3000 psig0 barg207 barg N/A NPT N/A 23.1
N/A BSSV6 N/A 2.50 inDN 65 N/A 2.50 in N/A 1.50 in38 mm N/A 0.16 psi4.5 in.water114 mm.water8.4 mmHg0.011 bar N/A 0 psig1100 psig0 barg75.8 barg N/A NPT N/A 36
N/A BSSV6 N/A 3.00 inDN 80 N/A 3.00 in N/A 1.72 in44 mm N/A 0.15 psi4.2 in.water107 mm.water7.8 mmHg0.01 bar N/A 0 psig900 psig0 barg62.1 barg N/A NPT N/A 57.4
N/A BSSV6 N/A 4.00 inDN 100 N/A 4.00 in N/A 2.22 in56 mm N/A 0.10 psi2.6 in.water66 mm.water4.8 mmHg0.007 bar N/A 0 psig450 psig0 barg31.0 barg N/A NPT N/A 90
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