Orifice Size Approximate Cv Chart
The table below can be used to estimate a Cv if the orifice size is known, or to relate the approximate orifice size if the Cv is not known.
Approximate Orifice Size (ins.)
Approximate Cv
1/32
.02
3/64
.06
1/16
.09
3/32
.20
1/8
.30
9/64
.36
3/16
.53
1/4
.70
5/16
1.7
3/8
2
1/2
3.5
5/8
4.5
11/16
5
3/4
7.5
1
13
1 1/4
17
1 1/2
25
48
2 1/2
60
3
100
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