Pipeline ancillaries Vacuum breakers
10
VB14
Sizes and pipe connections ½ "
(system connection) screwed BSP or NPT.
"
(air inlet connection) screwed BSP or NPT.
Pressure/temperature limits
Pressure psi g
0
29
58
87
116 145 174 203 232
500 392 302 212 122 32
Steam saturation curve
Pressure bar g
The product must not be used in this region.
Body design conditions
PN16
PMA Maximum allowable pressure
16 bar g @ 180 °C 232 psi g @ 356 °F
TMA Maximum allowable temperature
260 °C @ 7 bar g
500 °F @ 102 psi g
Minimum allowable temperature
-196 °C
-321 °F
PMO Maximum operating pressure for saturated steam service
14 bar g
203 psi g
7.12.3
TMO Maximum operating temperature
260 °C @ 7 bar g
500 °F @ 102 psi g
Minimum operating temperature
0 °C
32 °F
Note: For lower operating temperatures consult Spirax Sarco Designed for a maximum cold hydraulic test pressure of :
24 bar g
348 psi g
Capacity D p required to open vacuum breaker 4.6 mm Hg (0.2 in Hg)
∆p (in Hg)
1 1.2 1.6 2
4
8
12 16 20
6.4
10.12 2
4.2
2.1 1.9 1.7 1.5 1.3 1.1
D p (mm Hg)
TI-P019-02 CMGT Issue 12
Page 2 of 6
VB14, VB21 and VB21 Food+ Vacuum Breakers
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