Pricelist CE Oct 2024 - Flipbook - Page 212
FLOW, KV VALUES AND ZETA VALUES
FOR GATE VALVES
Calculated flow (m³/hr) going through a nominal valve size (DN40 = inside dia of 40 mm) at different flow velocities
Water velocity
(m/sec)
DN40
DN50
DN65
DN80
DN100
DN125
DN150
DN200
DN250
DN300
DN350
DN400
DN450
DN500
1
1,5
2
2,5
3
3,5
4
4,5
5
5
7
9
11
14
16
18
20
23
7
11
14
18
21
25
28
32
35
12
18
24
30
36
42
48
54
60
18
27
36
45
54
63
72
81
90
28
42
57
71
85
99
113
127
141
44
66
88
110
133
155
177
199
221
64
95
127
159
191
223
254
286
318
113
170
226
283
339
396
452
509
565
177
265
353
442
530
619
707
795
884
254
382
509
636
763
891
1018
1145
1272
346
520
693
866
1039
1212
1385
1559
1732
452
679
905
1131
1357
1583
1810
2036
2262
573
859
1145
1431
1718
2004
2290
2576
2863
707
1060
1414
1767
2121
2474
2827
3181
3534
Water velocity
(m/sec)
DN600
DN700
DN800
1
1,5
2
2,5
3
3,5
4
4,5
5
1018
1527
2036
2545
3054
3563
4072
4580
5089
1385
2078
2771
3464
4156
4849
5542
6234
6927
1810
2714
3619
4524
5429
6333
7238
8143
9048
2290
3435
4580
5726
6871
8016
9161
10306
11451
2827
4241
5655
7069
8482
9896
11310
12723
14137
DN900 DN1000
Hydraulic values, fully open valve
Kv (m³/hr - 1 bar)
Cv (Usg/min - 1 psi)
Zeta
Kv (m³/hr - 1 bar)
Cv (Usg/min - 1 psi)
Zeta
DN40
DN50
DN65
DN80
DN100
DN125
DN150
DN200
DN250
DN300
DN350
DN400
DN450
DN500
310
363
0.04
555
649
0.03
650
761
0.07
1050
1229
0.06
1945
2276
0.04
2770
3241
0.05
5715
6687
0.02
7755
9073
0.04
15405
18024
0.03
27295
31935
0.02
37150
43466
0.02
48520
56768
0.02
61410
71850
0.02
75815
88704
0.02
DN600
DN700
DN800
DN900 DN1000
109175 148600 194090 229572 283422
127735 173862 227085 268599 331604
0.02
0.02
0.02
0.02
0.02
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)
94 |
