Pipeline ancillaries
HVB3aslltvoaplveaslve
Steam
saturation
curve
7.4.89
Steam
saturation
curve
Pressure / temperature limits
M21Si2 ISO and M21Si3 ISO - PDR 0.8 seats
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M21Vi2 ISO and M21Vi3 ISO - PTFE seats
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The product must not be used in this region.
Body design conditions
PMA Maximum allowable pressure
TMA Maximum allowable temperature
Minimum allowable temperature
PMO Maximum operating pressure for saturated steam service
TMO Maximum operating temperature
Minimum operating temperature
Note: For lower operating temperatures consult Spirax Sarco
PMX MaximumdifferentialpressureislimitedtothePMO
Designed for a maximum cold hydraulic test pressure of 60 bar g
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Pressure bar g
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Pressure bar g
M21Si
M21Vi
M21Si
M21Vi
M21Si
M21Vi
PN40
40 bar g @ 120 °C
40 bar g @ 120 °C
260 °C @ 0 bar g
230 °C @ 0 bar g
-29 °C
17.5 bar g
10.0 bar g
260 °C @ 0 bar g
-29 °C
Page 2 of 7
TI-P133-77 ST Issue 4
M21Si ISO and M21Vi ISO Reduced Bore Ball Valves DN15 to DN150 Flanged PN40
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