Control valves
Safety valves
Sizing and selection
Refer to:- http://www.spiraxsarco.com/prs/product-sizing.asp
Dimensions, weights and orifice sizes (approximate) in inches and lbs
Valve inlet
Size
Connection
Valve outlet
Size
Connection
Orifice
letter
A
ins
B
ins
C
ins
Weight
Ibs
11⁄2"
ASME 300
2"
ASME 150
F
4.25
4.5
15.7
31
11⁄2"
ASME 300
2"
ASME 150
G
4.25
4.5
15.7
31
11⁄2"
ASME 300
21⁄2"
ASME 150
H
4.90
4.8
16.2
46
11⁄2"
ASME 300
21⁄2"
ASME 150
J
4.90
4.8
16.2
46
2"
ASME 300
3"
ASME 150
K
5.60
5.1
18.5
62
21⁄2"
ASME 300
4"
ASME 150
L
6.40
6.1
20.1
90
3"
ASME 300
4"
ASME 150
M
6.50
6.5
25.0
117
4"
ASME 300
6"
ASME 150
N
7.50
7.2
26.7
198
4"
ASME 300
6"
ASME 150
P
8.30
7.1
28.7
212
6"
ASME 300
8"
ASME 150
Q
9.40
9.9
34.8
384
6"
ASME 300
8"
ASME 150
R
10.00
10.9
43.9
633
Safety information, installation and maintenance
For full details see the Installation and Maintenance Instructions
(IM-S13-33) supplied with the product.
Installation note:
The safety valve should always be fitted with the centre line of the
spring housing vertically above the valve.
SV7 safety valve selection guide
SV7
4
Series number
Construction
ASME section
C
Size and
connection
Actual
orifice area
Sq. In.
B
Set pressure
A
-
-
-
How to order
Example 1: 1 off Spirax Sarco SV74-V-XP-180 safety valve having
a set pressure of 180 psi g.
SV7
4 =
V =
U =
Blank =
S =
T =
U =
V =
W =
X =
Y =
F =
G =
H =
J =
K =
L =
M =
N =
P =
Q =
Cast steel
ASME Code Section I
ASME Code Section VIII
Valve without code stamp
11⁄2"ASME300 x 2" ASME150
11⁄2"ASME300 x 21⁄2"ASME150
2"ASME300 x 3" ASME150
21⁄2"ASME300 x 4" ASME150
3"ASME300 x 4" ASME150
4"ASME300 x 6" ASME150
6"ASME300 x 8" ASME150
0.328
0.537
0.841
1.374
1.968
3.054
3.846
4.633
6.830
11.811
V
X
P
R = 17.123
Specify set pressure from
5 psi g to 250 psi g
180
SV7
4 X
P
V
180
TI-S13-30 CH Issue 13
SV74 Carbon Steel Safety Valve
Page 5 of 5
4.7.40
