Pipeline ancillaries Vacuum breakers
10
Materials
1
5
2
4
No.
Part
Material
1 2 4 5
Cap
Stainless steel
AISI 303
Valve (internal)
Stainless steel
AISI 440 C
Body
Stainless steel
AISI 303
Gasket
Stainless steel
AISI 304
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
10.12 74
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
TI-P095-01 CMGT Issue 1
Page 2 of 3
VBS21 and VBS21 Food+ Vacuum Breaker
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