-4-
■
EPDT-209
■
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
15A
20A 25A 32A 40A 50A
Cv value
1.5
1.9
3
4
7
10
●
Calculation formula for Cv value
P
G
V
Cv
Δ
=
365
.
0
P
1
: Inlet pressure
[MPa
･
A]
V : Rated flow rate [m
3
/h]
P
2
: Reduced pressure [MPa
･
A] G : Specific gravity relative to water
Δ
P : P
1
－
P
2
[MPa] Cv : Cv value of the nominal size
Δ
P: Inlet/reduced pressure differential (MPa)
V
: Flow rate
(m
3
/h)
Nominal size
