Control systems Safety valves
4
Table 1 - SV615 flow capacity for saturated steam in kilogrammes per hour (kg/h) (calculated in accordance with EN ISO 4126:2004 at 5% 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 dry saturated steam kg/h
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5
68
188
271
396
644
996
90
250
360
527
857
1324
112
312
449
656
1067
1650
134
373
537
785
1276
1973
156
434
624
913
1485
2295
178
494
712
1040
1692
2616
200
555
799
1168
1899
2936
221
615
885
1295
2106
3256
243
675
972
1422
2312
3574
265
735
1058
1548
2517
3892
286
795
1144
1674
2722
4208
4.7 33
308
855
1230
1799
2926
4524
329
914
1316
1925
3130
4839
350
974
1402
2050
3334
5154
372
1033
1487
2175
3537
5468
393
1092
1573
2300
3740
5783
414
1152
1658
2425
3943
6096
436
1211
1743
2549
4146
6410
457
1270
1828
2674
4348
6723
10.0
478
1329
1913
2798
4551
7036
11.0
521
1447
2084
3047
4955
7661
12.0 13.0 14.0 15.0 16.0 17.0 18.0
563
1565
2253
3295
5359
8286
606
1683
2423
3544
5763
8910
648
1801
2593
3792
691
1919
2762
4040
733
2037
2932
4288
775
2155
3101
4535
818
2272
3271
4783
TI-P316-01 CTLS Issue 20
Page 5 of 10
SV615 Safety Valve
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