Control valves
Safety valves
Page 4 of 5
Valve size DN
20/32
25/40
32/50
40/65
50/80
65/100
80/125
100/150
125/200
150/250
Orifice (mm)
17.0
23.8
30.6
38.0
50.1
59.0
73.0
91.0
105
125
Area (mm2)
230
445
740
1140
1979
2734
4185
6504
8659
12272
Set pressure (bar g)
Flow capacity for hot water kW
1.0
122
236
327
504
875
1 172
1 795
3 050
4 061
5 756
1.5
149
288
437
673
1 168
1 569
2 402
3 733
4 970
7 044
2.0
176
341
531
818
1 421
1 883
2 882
4 416
5 879
8 333
2.5
204
394
580
894
1 552
2 143
3 281
5 099
6 789
9 621
3.0
229
443
653
1 005
1 745
2 411
3 691
5 737
7 637
10 824
3.5
256
496
730
1 125
1 953
2 698
4 131
6 419
8 546
12 112
4.0
282
545
803
1 237
2 147
2 966
4 541
7 057
9 395
13 315
4.5
307
594
875
1 349
2 341
3 234
4 951
7 694
10 244
14 518
5.0
333
643
948
1 460
2 535
3 502
5 361
8 332
11 092
15 720
5.5
358
693
1 020
1 572
2 729
3 770
5 771
8 969
11 941
16 923
6.0
382
738
1 088
1 676
2 909
4 019
6 152
9 561
12 729
18 040
6.5
414
802
1 181
1 819
3 158
4 363
6 679
10 380
13 820
19 586
7.0
431
833
1 228
1 891
3 283
4 536
6 943
10 790
14 365
20 359
7.5
456
882
1 300
2 003
3 477
4 804
7 353
11 428
15 214
21 562
8.0
480
928
1 368
2 107
3 657
5 052
7 734
12 019
16 002
22 679
8.5
500
967
1 425
2 195
3 810
5 263
8 056
12 520
16 669
23 624
9.0
529
1 023
1 507
2 322
4 031
5 569
8 525
13 249
17 638
24 998
9.5
556
1 076
1 585
2 442
4 239
5 856
8 964
13 932
18 548
26 287
10.0
574
1 111
1 637
2 522
4 378
6 048
9 257
14 387
19 154
27 146
4.7.23
Valve size DN
20/32
25/40
32/50
40/65
50/80
65/100
80/125
100/150
125/200
150/250
Orifice (mm) do
17.0
23.8
30.6
38.0
50.1
59.0
73.0
91.0
105
125
Area (mm2) Ao
230
445
740
1140
1979
2734
4185
6504
8659
12272
Set pressure bar g
w values
1.0
0.79
0.79
0.66
0.66
0.66
0.64
0.64
0.70
0.70
0.70
1.5
0.79
0.79
0.72
0.72
0.72
0.70
0.70
0.70
0.70
0.70
2.0
0.79
0.79
0.74
0.74
0.74
0.71
0.71
0.70
0.70
0.70
2.5 to 10
0.79
0.79
0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
Set pressure bar g
K
1.0
0.67
1.5
0.82
2.0
0.97
2.5
1.12
3.0
1.26
3.5
1.41
4.0
1.55
4.5
1.69
5.0
1.83
6.0
2.10
7.0
2.37
8.0
2.64
9.0
2.91
10.0
3.16
Table 1 - SV60H flow capacities for hot water in kilowatts (kW) at or above 100°C
(calculated in accordance with TRD 721)
Table 2 - TRD 721 sizing
The safety valve discharge capacity expressed as heat output p of the heat generator in kW is calculated according to the following
formula:
P = Ao .
w
. K
Constant K depending on the set pressure (bar g)
SV60H Safety Valve
TI-P317-02 CH Issue 4
Page 4 of 5
