Product Overview

VBN2, VBN3 CONTROL BALL VALVES WITH THREADED CONNECTIONS
62-2648 6
Effective C
V
When valves are mounted between pipe reducers, there is a
decrease in actual valve capacity because the reducers create
additional pressure losses in the system. This is especially true
for ball valves because of their high capacity.
The C
V
values in Tables 4 and 5 are a guideline. Use the
Effective C
V
, not the valve C
V
by itself, to more accurately
apply a control valve to the piping system. Multiply the C
V
value by 0.865 to get the capacity in K
VS
, if metric units are
required.
Table 5. Effective C
V
’s Using Pipe Reducers (Two-way) Table 6. Effective C
V
’s Using Pipe Reducers (Three-way)
Flow Characteristics
The VBN2 Two-Way Ball Valves have:
• an equal percentage flow characteristic with characterized
flow control insert.
• a linear flow characteristic with full port balls.
The VBN3 Three-Way Ball Valves have:
• between ports A and AB: an equal percentage flow
characteristic.
• between ports B and AB: a linear flow characteristic.
Valve
Size
(in.)
Effective C
V
Pipe Size (NPT)
1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4" 5"
1/2"
0.38 0.38 0.38 0.38
0.68 0.68 0.68 0.68
1.3 1.3 1.3 1.3
2.0 2.0 2.0 2.0
2.6 2.5 2.5 2.4
4.7 4.3 4.1 3.9
8.0 6.5 5.7 5.4
11.7 7.9 6.7 6.2
3/4"
0.31 0.31 0.31 0.31
0.63 0.63 0.63 0.63
1.2 1.2 1.2 1.2
2.5 2.5 2.5 2.5
4.3 4.3 4.2 4.2
7.4 7.2 6.4 6.8
10.1 9.6 9.1 8.8
14.7 7.1 6.5 6.2
29 21.1 17.1 15.4
1"
4.4 4.4 4.4 4.4 4.4 4.3
9.0 8.9 8.8 8.7 8.6 8.6
15.3 14.9 14.4 13.8 13.5 13.4
26 24 22 20 19 19
44 37 31 26 24 23
54 42 34 28 26 25
1-1/4"
4.4 4.4 4.4 4.4 4.4 4.4
8.3 8.3 8.2 8.2 8.2 8.1
14.9 14.8 14.5 14.3 14.2 14.0
25 25 23 22 22 22
37 35 31 30 29 28
41 39 34 32 31 29
102 79 53 46 42 39
1-1/2"
23 22 22 22 22 21
30 29 28 28 27 27
41 39 37 36 35 34
74 64 56 52 48 47
172 101 77 67 60 57
2"
42 41 41 40 40
57 56 54 52 51
71 69 65 62 61
100 94 87 79 72
108100928379
210 165 135 111 102
266 190 146 117 106
2-1/2"
45 44 43 42
55 53 51 50
72 67 63 61
101888076
162 119 101 94
202 132 109 101
3"
49 46 45
63 57 55
82 69 67
124 90 85
145 97 91
Valve
Size
(in.)
Effective C
V
Pipe Size (NPT)
1/2" 3/4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4" 5"
1/2"
0.33 0.33 0.30 0.30
0.59 0.59 0.60 0.60
1.0 1.0 1.0 1.0
2.4 2.4 2.3 2.3
4.3 4.3 4.0 3.8
8.0 8.0 7.9 5.7
3/4"
0.40 0.40 0.40 0.40
0.66 0.66 0.66 0.66
1.3 1.3 1.3 1.3
2.4 2.4 2.4 2.4
3.8 3.8 3.7 3.7
12.6 11.7 10.7 10.4
1"
0.40 0.40 0.40 0.40 0.40 0.40 0.40
0.65 0.65 0.65 0.65 0.65 0.65 0.65
1.3 1.3 1.3 1.3 1.3 1.3 1.3
2.3 2.3 2.3 2.3 2.3 2.3 2.3
3.5 3.5 3.5 3.5 3.5 3.5 3.5
4.5 4.5 4.5 4.5 4.5 4.4 4.4
8.6 8.6 8.5 8.4 8.3 8.2 8.2
14.9 14.9 14.6 14.1 13.5 13.3 13.1
22 22 21 20 18.0 18.0 17.0
31 31 28 25 22 21 21
1-1/4"
4.1 4.0 4.0 4.0 4.0 4.0
7.7 7.7 7.6 7.6 7.6 7.6
8.7 8.6 8.6 8.5 8.5 8.5
12.7 12.6 12.4 12.3 12.2 12.2
19 19 19 18.1 17.9 17.6
27 26 25 24 23 23
34 33 30 28 27 27
1-1/2"
4.0 4.0 4.0 4.0 4.0
8.3 8.2 8.2 8.2 8.2
13.4 13.3 13.2 13.2 13.1
24 23 23 22 22
32 31 30 29 27
61 55 50 47 44
2"
24 24 24 24
38. 38 37 37
57 56 54 52
83 70 75 70
109 101 92 83
2-1/2"
38 37 37
74 68 65
100 87 79