Spirax Sarco Spira-trol K Series, Installation And Maintenance Instructions Manual

Page: 19 / 68

IM-S24-42 CTLS Issue 10
19
0 4 8 12 16
300
250
200
150
100
50
0
-50
0 4 8 12 16
400
300
200
100
0
-50
Notes:
1.
Where the process fluid temperature is sub-zero and the ambient temperature is below +5 °C, the external
moving parts of the valve and actuator must be heat traced to maintain normal operation.
2. When selecting a valve with a bellows sealed bonnet, the pressure/temperature limits of the bellows
must be read in conjunction with the valve pressure/temperature limits shown in table below.
Body design conditions PN40
Maximum design pressure 40 bar g @ 50 °C
Maximum design temperature 400 °C
Minimum design temperature -50 °C
Maximum operating temperature
PTFE soft seat (G) 200 °C
Standard packing PTFE chevron
250 °C PEEK seat (K and P)
Extended bonnet (E) with PTFE chevron
High temperature packing (H)
400 °C
Extended bonnet (E) with graphite packing
Note:
We recommend that an extended bonnet (E) with graphite packing is used where valve operation is
above 300 °C.
The product must not be used in this region.
Bellows D
Te
mp
er
atu
re
°C
Pressure bar g
Te
mp
er
atu
re
°C
Pressure bar g
Steam
saturation
curve
Steam
saturation
curve
Bellows C