44
Control systems Self-acting controls
Pressure/temperature limits
Pressure psi g
0
72.5
145
217
290
362
500 392 302 212 122 32
Steam saturation curve
Pressure bar g
The product must not be used in this region.
Body design conditions
PN25
Maximum design pressure
25 bar g @ 260 °C
363 psi g @ 500 °F
Maximum design temperature
260 °C @ 10.5 bar g
500 °F @ 152 psi g
Minimum design temperature
-10 °C
14 °F
Maximum operating temperature
260 °C @ 10.5 bar g
500 °F @ 152 psi g
4.5 40
Minimum operating temperature Note : For lower operating temperatures consult Spirax Sarco
0 °C
Size
1"
1¼"
1½"
2"
10.0 (145)
9.0 (131)
8.2 (119) 16.0 (232)
6.9 (100) 13.8 (200)
KB51
Maximum differential pressure psi (bar)
KC51
-
-
Designed for a maximum cold hydraulic test pressure of:
38 bar g
551 psi g
Kv values Size
1"
1¼"
1½"
2"
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
KB51
9.80
16.48
23.70
34.00
KC51
-
-
16.48
34.00
Capacities For saturated steam sizing capacities see TI-GCM-08. For water valve sizing capacities see TI-GCM-09.
TI-P078-04 CTLS Issue 10
Page 2 of 5
KB51 and KC51 Bronze Self-Acting Control Valves
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