44
Control systems Self-acting controls
Pressure/temperature limits
Pressure psi g
0
150
290
435
580
572
A
392
The product must not be used in this region.
Steam saturation curve
212
D
E
C
B
32
Pressure bar g
A - B Flanged EN 1092 PN40, ASME 300 and BS 10 Table H. A - C Flanged EN 1092 PN25 and ASME 150
A - D Flanged JIS/KS 10 A - E Flanged JIS/KS 20
Body design conditions
PN40
Maximum design pressure
40 bar g @ 20 °C
580 psi g @ 68 °F
4.5 34
Maximum design temperature
300 °C @ 25.8 bar g
572 F @ 374 psi g
Minimum design temperature
-10 °C
14 °F
A - B A - C A - D
300 °C @ 25.8 bar g
572 °F @ 374 psi g
300 °C @ 10.0 bar g
572 °F @ 145 psi g
Maximum operating temperature
300 °C @ 10 bar g
572 °F @ 145 psi g
A - E
300 °C @ 25.8 bar g
572 °F @ 374 psi g
Minimum operating temperature Note : For lower operating temperatures consult Spirax Sarco
0 °C
DN15 (½") 17.0 (247)
DN20 (¾") 10.0 (145)
DN25 (1")
DN32 (1¼")
DN40 (1½")
DN50 (2")
Size
4.5 (65)
3.0 (44)
2.0 (29)
1.5 (22)
KA43
Maximum differential pressure bar
10.0 (145)
9.0 (131) 16.0 (232)
8.2 (119) 16.0 (232)
6.9 (100) 13.8 (200)
KB43
KC43
24 bar g (348 psi g)
Designed for a maximum cold hydraulic test pressure of:
Kv values Size
DN15 (½")
DN20 (¾")
DN25 (1")
DN32 (1¼")
DN40 (1½")
DN50 (2")
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
KA43
2.90
4.64
9.80
16.48
23.70
34.00
KB43
-
-
9.80
16.48
23.70
34.00
KC43
-
-
-
16.48
16.48
34.00
Capacities For saturated steam sizing capacities see TI-GCM-08. For water valve sizing capacities see TI-GCM-09.
TI-P078-06 CTLS Issue 9
Page 2 of 5
KA43, KB43 and KC43 Steel Self-acting Control Valves
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