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4. Nominal Size Selection
4.1 Nominal Size Selection Chart (For Water)
Note: *The Chart shown above is for a GD-24 valve without SY-24.
*Considering such factors as noise and durability, a 2 m/s flow velocity
within the pipe is ideal.
●Cv Value
Nominal size
Cv value
●Calculation formula for Cv value
Cv
P
: Inlet pressure
1
P
: Reduced pressure
2
ΔP : P
－P
1
ΔP: Inlet/reduced pressure differential (MPa)
15A
20A
1.5
1.9
. 0
365
V
G
=
∆
P
[MPa･A]
[MPa･A]
[MPa]
2
25A
32A
3
4
V : Rated flow rate [m
G : Specific gravity relative to water
Cv : Cv value of the nominal size
-5-
Nominal size
40A
50A
7
10
/h]
3
■ EPDT-175d■
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