Pipeline ancillaries Vacuum breakers
10
VB21 and VB21 Food+
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
72.5
145
218
290
363
752 572 392 212 32
Steam saturation curve
Pressure bar g
The product must not be used in this region.
Body design conditions
PN25
PMA Maximum allowable pressure
25 bar g @ 120 °C 363 psi g @ 248 °F
TMA Maximum allowable temperature
400 °C @13 bar g
752 °F @ 189 psi g
Minimum allowable temperature
-48 °C
-54.4 °F
PMO Maximum operating pressure for saturated steam service
21 bar g
305 psi g
TMO Maximum operating temperature
400 °C @ 13 bar g
752 °F @ 189 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:
38 bar g
551 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 5
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 5 of 6
VB14, VB21 and VB21 Food+ Vacuum Breakers
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