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4.3 Commissioning and pressure testing
Exceeding the permitted values shown on the valve may damage the valve and, in the worst case, lead to
an uncontrolled pressure discharge. This can damage the product and could also cause personal injury
and property damage. When the valve is closed, the maximum permitted testing pressure is 1.1xPN.
While the pipeline is being pressure-tested, (1.5xPN) the valve must be opened.
4.4 Determining the pre-set value for the balancing valve
The desired Kv value can be pre-set for the valve:
· If the desired Kv value is known, the suitable valve size and pre-set value can be verified using Table 1.
· If the desired Kv value is not known, the suitable valve size and pre-set value can be determined using
pressure loss diagrams (pages 18–20) if the valve's flow rate and pressure loss are known.
Pre-set value
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
Table 1. Kv values for Vexve X balancing valves
12
DN 15
DN 20
-
0,04
0,04
0,07
0,06
0,12
0,11
0,20
0,18
0,30
0,25
0,45
0,33
0,63
0,45
0,83
0,59
1,02
0,72
1,51
0,90
2,10
1,13
2,72
1,42
3,52
1,70
4,39
2,04
5,40
2,32
6,66
2,61
8,18
DN 25
DN 32
0,19
0,22
0,35
0,41
0,56
0,61
0,77
0,85
1,10
1,21
1,41
1,67
1,80
2,17
2,29
2,68
2,86
3,46
3,60
4,50
4,63
5,89
5,62
7,35
6,77
9,14
8,35
11,01
9,96
12,85
11,76
15
13,75
17,29
DN 40
DN 50
0,48
0,71
0,6
1,29
0,82
2,09
1,29
3,10
1,84
4,02
2,47
5,11
3,29
6,48
4,19
8,20
5,44
10,43
7,05
13,01
9,09
16,25
11,45
20,39
13,99
24,53
17,09
29,30
20,24
34,13
22,78
37,10
25,14
39,73
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