Control systems Safety valves
4
Sizing and selection Refer to:- http: // www.spiraxsarco.com / resources / steam-engineering-tutorials / safety-valves / safety-valve-sizing.asp
Dimensions, weights and orifice sizes (approximate) in inches and lbs Valve inlet Valve outlet Orifice A A1
B
C Weight
Size
Connection Size
Connection letter
ins
ins
ins
ins
lbs
1½"
NPT NPT NPT NPT
2½"
NPT NPT NPT NPT NPT NPT NPT NPT NPT NPT NPT
J
3.5
-
4.3
15.8
33
2"
3" 4" 4"
K
4.0
-
4.6
17.1
46
2½"
L
4.6
-
5.5
18.5
66
3"
M
5.1
-
5.6
24.3
93
1½"
ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250 ANSI 250
2½" 2½"
J J
3.5
-
4.3
15.8
38
2" 2"
3.5
-
4.3
15.8
40
3" 3" 4" 4" 4" 4" 4" 6" 6" 8" 8"
K K L L M
4.0
-
4.6
17.1
49
2½" 2½"
4.0
-
4.6
17.1
51
4.6
-
5.5
19.5
71
3" 3" 3" 3" 4" 4" 6" 6"
4.6
-
5.5
19.5
73
4.7 103
5.1
-
5.4
24.3
101
ANSI 125 ANSI 125 ANSI 125 ANSI 125 ANSI 125 ANSI 125
L
-
5.5
5.5
19.5
82
M
-
5.5
5.4
24.3
110
N
-
7.1
6.8
26.5
187
P
-
7.1
6.8
28.5
196
Q
-
9.3
9.3
34.5
355
R
-
10.0
10.9
43.9
595
Note: Drain hole connection ½" NPT on all valve sizes
C
C
B
B
A
A1
TI-S13-25 CTLS Issue 12
Page 7 of 8
SV73 Cast Iron Safety Valve
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