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Control systems Self-acting controls
Pressure/temperature limits
Steam saturation curve
Pressure bar g
The product must not be used in this region.
Body design conditions
PN16
16 bar g @ 120 ° C
Maximum design pressure
220 ° C @ 13.8 bar g
Maximum design temperature
-10 ° C
Minimum design temperature
220 ° C
Maximum operating temperature
0 ° C
Minimum operating temperature
Note: For lower operating temperatures consult Spirax Sarco
4.5 28
Size
DN15
DN20
DN25
DN32
DN40
DN50
KA31
13.0
10.3
4.5
3.0
2.0
1.5
KA33
13.0
10.3
4.5
3.0
2.0
1.5
Maximum differential pressure bar
KB31
10.3
9.0
8.2
6.9
KB33
10.3
9.0
8.2
6.9
Designed for a maximum cold hydraulic test pressure of:
24 bar g
Kv values Size
DN15
DN20
DN25
DN32
DN40
DN50
For conversation Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
KA31, KA33
2.90
4.64
9.80
16.48
23.70
34.00
KB31, KB33
9.80
16.48
23.70
34.00
Capacities For saturated steam sizing capacities see TI-GCM-08. For water valve sizing capacities see TI-GCM-09.
TI-P078-02 CTLS Issue 14
Page 2 of 5
KA31, KA33, KB31 and KB33 Cast Iron Self-acting Control Valves
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