Pricelist CE Oct 2024 - Flipbook - Page 215
FLOW, KV VALUES AND ZETA VALUES
FOR BUTTERFLY VALVES
Calculated flow (m³/hr) going through a nominal valve size (DN 200 = inside dia of 200 mm)
at different flow velocities
Water velocity (m/sec)
DN 150 DN 200 DN 250 DN 300 DN 350 DN 400 DN 450 DN 500 DN 600 DN 700 DN 800
DN
900
DN
1000
DN
1200
DN
1400
DN
1500
6362
1
64
113
177
254
346
452
573
707
1018
1385
1810
2290
2827
4072
5542
1,5
95
170
265
382
520
679
859
1060
1527
2078
2714
3435
4241
6107
8313
9543
2
127
226
353
509
693
905
1145
1414
2036
2771
3619
4580
5655
8143
11084
12723
2,5
159
283
442
636
866
1131
1431
1767
2545
3464
4524
5726
7069
10179
13854
15904
3
191
339
530
763
1039
1357
1718
2121
3054
4156
5429
6871
8482
12215
16625
19085
3,5
223
396
619
891
1212
1583
2004
2474
3563
4849
6333
8016
9896
14250
19396
22266
4
254
452
707
1018
1385
1810
2290
2827
4072
5542
7238
9161
11310
16286
22167
25447
4,5
286
509
795
1145
1559
2036
2576
3181
4580
6234
8143
10306
12723
18322
24938
28628
5
318
565
884
1272
1732
2262
2863
3534
5089
6927
9048
11451
14137
20358
27709
31809
Water velocity (m/sec)
DN
1600
DN
1800
DN
2000
DN
2200
DN
2400
DN
2800
DN
3000
DN
3200
DN
3600
DN 600
DN 700
1
7238
9161
11310
13685
16286
22167
25447
28953
36644
1,5
10857
13741
16965
20527
24429
33251
38170
43429
54965
2
14476
18322
22619
27370
32572
44334
50894
57906
73287
2,5
18096
22902
28274
34212
40715
55418
63617
72382
91609
3
21715
27483
33929
41054
48858
66501
76341
86859
109931
3,5
25334
32063
39584
47897
57001
77585
89064
101335 128252
4
28953
36644
45239
54739
65144
88668
101788 115812 146574
4,5
32572
41224
50894
61581
73287
99752
114511 130288 164896
5
36191
45804
56549
68424
81430
110835 127234 144765 183218
DN 150
DN 200
DN 250
DN 300
DN 350
DN 400
DN 450
DN 500
DN 800
DN 900
Kv (m³/hr - 1 bar)
1385
2460
4360
6120
10195
13335
17320
22460
34330
37845
57665
69930
Cv (Usg/min - 1 psi)
1620
2878
5101
7160
11928
15602
20264
26278
40166
44279
67468
81818
Zeta (K)
0,42
0,42
0,33
0,33
0,23
0,23
0,22
0,20
0,18
0,27
0,20
0,21
DN 1000
DN 1200
DN 1400
DN 1500
DN 1600
DN 1800
DN 2000
DN 2200
DN 2400
DN 2800
DN 3000
DN 3200
Kv (m³/hr - 1 bar)
90720
133345
196585
207335
247675
332095
432320
524915
533425
798585
916740
1043046
DN 3600
1320105
Cv (Usg/min - 1 psi)
106142
156014
230004
242582
289780
388551
505814
614151
624107
934344
1072586
1220364
1544523
Zeta (K)
0,19
0,19
0,16
0,19
0,17
0,15
0,14
0,14
0,19
0,15
0,15
0.15
0.15
NOTE: Hydraulic figures are based on tests or calculations, depending on size. Value uncertainty as per ref EN1267
Definitions / formulas:
Kv-value: Actual flow of water (m³/ hr) creating pressure loss of 1 bar.
Pressure loss coefficient Zeta (K) value: Ratio of static to dynamic pressure loss.
Zeta (K) = Diff pressure / (500 X V²)
Diff pressure (Pa)
V: Water flow velocity (m/sec)
Actual diff pressure (bar) = (Q / Kv)²
Q: Actual water flow (m³/hr)
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