Spirax Sarco Spira-trol K Series Installation And Maintenance Instructions Manual page 23

Notes:
1. Where the process fluid temperature is sub-zero and the ambient temperature is below +5 °C (41 °F),
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 above.
3.
As standard the KEA, KFA, KLA series two-port control valves are supplied with the PTFE stem sealing
option.
Body design conditions
ASME 150 (6" to 12" only)
Maximum design
pressure
ASME 300
Maximum design temperature
Minimum design temperature
PTFE soft seat (G)
Standard packing PTFE chevron
PEEK seat (K and P)
Maximum operating
temperature
Extended bonnet (E) with PTFE chevron
Graphite packing (H)
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 (572 °F).
Bellows C
Pressure bar g
0 50 100
425
400
300
200
Steam
100
saturation
curve
0
-29
0 5
Pressure bar g
The product must not be used in this region.
IM-S24- 42 CTLS Issue 10
150 200 250 284
797
600
400
200
0
-20
10 15 19.6
ASME 150 and ASME 300
19.6 bar g @ 38 °C
51.1 bar g @ 38 °C
425 °C
-29 °C
200 °C
250 °C
425 °C
Bellows D
Pressure bar g
0 50 100
300
250
200
150
Steam
saturation
100
curve
50
0
-29
0 4 8
Pressure bar g
(284 psi g @ 100 °F)
(740 psi g @ 100 °F)
(800 °F)
(-20 °F)
(392 °F)
(482 °F)
(800 °F)
150 200 232
572
500
400
300
200
100
0
-20
12 16
23