Pipeline ancillaries Ball valves
10
Pressure/temperature limits M21Si2 ISO and M21Si3 ISO - PDR 0.8 seats
Steam saturation curve
Pressure bar g
M21Vi2 ISO and M21Vi3 ISO - PTFE seats
Steam saturation curve
Pressure bar g
The product must not be used in this region.
Body design conditions
PN40
M21Si
40 bar g @ 120 °C
PMA Maximum allowable pressure
M21Vi
40 bar g @ 120 °C
M21Si
260 °C @ 0 bar g
TMA Maximum allowable temperature
M21Vi
230 °C @ 0 bar g
Minimum allowable temperature
-29 °C
M21Si
17.5 bar g
7.3.155
PMO Maximum operating pressure for saturated steam service
M21Vi
10.0 bar g
TMO Maximum operating temperature
260 °C @ 0 bar g
Minimum operating temperature Note: For lower operating temperatures consult Spirax Sarco PMX Maximum differential pressure is limited to the PMO Designed for a maximum cold hydraulic test pressure of 60 bar g
-29 °C
10.3 152
TI-P133-77 CMGT Issue 5
Page 2 of 9
M21Si ISO and M21Vi ISO Reduced Bore Ball Valves DN15 to DN150 Flanged PN40
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