Nominal Size Selection; Nominal Size Selection Chart - Yoshitake GD-24 Installation & Operation Manual

5. Nominal Size Selection

5.1 Nominal Size Selection Chart (For Water)
Note: *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
=
Δ
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
-4-
Nominal size
40A 50A
7 10
/h]
3
■EPDT-209■