44
Control systems Safety valves
Table 2 - SV615 flow capacity for air in litres per second (normal I/s) at 0 °C and 1.013 bar a (calculated in accordance with EN ISO 4126:2004 at 10% overpressure) Derated coefficient of discharge (Kdr) = 0.71
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 air I/s
0.5
24
67
97
142
230
356
1.0
33
91
131
191
311
481
1.5
41
115
165
241
392
606
2.0
50
138
199
291
473
732
3.0
67
186
267
391
635
982
4.0
84
233
335
490
797
1 233
5.0
101
280
403
590
959
1 483
6.0
118
328
472
690
1 121
1 734
7.0
135
375
540
789
1 283
1 984
8.0
152
422
608
889
1 446
2 235
4.7 34
9.0
169
470
676
988
1 608
2 485
10.0
186
517
744
1 088
1 770
2 736
11.0
203
564
812
1 188
1 932
2 986
12.0
220
612
880
1 287
2 094
3 237
13.0
237
659
948
1 387
2 256
3 487
14.0 16.0 18.0
254
706
1 017
1 487
2 418
3 738
288
801
1 153
1 686
322
896
1 289
1 885
TI-P316-01 CTLS Issue 20
Page 6 of 10
SV615 Safety Valve
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