Control systems Safety valves
4
Table 1 - SV60H flow capacities for hot water in kilowatts (kW) at or above 100 °C (calculated in accordance with TRD 721) 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 4.0 4.5
256
496
730
1 125 1 953 2 698 4 131 6 419 8 546 12 112
282
545
803
1 237 2 147 2 966 4 541 7 057 9 395 13 315
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 6.0 6.5
358
693
1 020 1 572 2 729 3 770 5 771 8 969 11 941 16 923
4.7 57
382
738
1 088 1 676 2 909 4 019 6 152 9 561 12 729 18 040
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
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 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
TI-P317-02 CTLS Issue 5
Page 5 of 7
SV60H Safety Valve
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