Control systems Safety valves
4
Table 3 - SV615 flow capacity for water in kilogrammes per hour (kg/h) at 20 °C (calculated in accordance with EN ISO 4126:2004 at 10% overpressure) Derated coefficient of discharge (Kdr) = 0.52
Valve size DN in/out
15/20
20/32
25/40
32/50
40/65
50/80
Flow area (mm 2 )
113
314
452
661
1 075
1 662
Set pressure (bar g)
Flow capacity for water kg/h
0.5
2 216
6 159
8 866
12 965
21 086
32 599
1.0
3 135
8 710
12 538
18 335
29 819
46 102
1.5
3 839
10 668
15 356
22 456
36 521
56 463
2.0
4 433
12 318
17 731
25 930
42 171
65 198
3.0
5 429
15 086
21 717
31 758
51 649
79 851
4.0
6 269
17 420
25 076
36 671
59 639
92 204
5.0
7 009
19 476
28 036
40 999
66 678
103 088
6.0
7 678
21 335
30 712
44 913
73 042
112 927
7.0
8 293
23 045
33 173
48 511
78 895
121 975
8.0
8 866
24 636
35 463
51 861
84 342
130 397
4.7 35
9.0
9 404
26 130
37 614
55 006
89 458
138 307
10.0
9 912
27 544
39 649
57 982
94 297
145 788
11.0
10 396
28 888
41 584
60 812
98 900
152 904
12.0
10 858
30 172
43 433
63 516
103 298
159 703
13.0
11 302
31 405
45 207
66 110
107 515
166 224
14.0 16.0 18.0
11 728
32 590
46 913
68 605
111 574
172 499
12 538
34 840
50 152
73 342
13 299
36 954
53 194
77 791
TI-P316-01 CTLS Issue 20
Page 7 of 10
SV615 Safety Valve
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