Control systems Self-acting controls
4
Pressure/temperature limits
Pressure psi g
0
72.5
145
217
290
362
500 449 392 302 212 122 32
Steam saturation curve
Pressure bar g
The product must not be used in this region. When the valve is operated with a self-acting temperature control system in this region, a Spirax Sarco spacer must be used.
Body design conditions
PN25
Fitted to a Spirax Sarco spacer
260 °C
500 °F
Maximum design temperature
Fitted directly to an actuator
232 °C
450 °F
4.5 23
BX
17.2 bar
250 psi
Maximum differential pressure
BXRA
10.3 bar
150 psi
Designed for a maximum cold hydraulic test pressure of:
38 bar g
550 psi g
Kv values BX2
BX3
BX4
BX6
BXRA
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
0.38
0.64
1.03
1.65
0.59
Capacities For saturated steam sizing capacities, see TI-GCM-08. For water sizing capacities, see TI-GCM-09.
TI-P036-02 CTLS Issue 7
Page 3 of 5
BX and BXRA Gunmetal Self-acting Control Valves
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