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5.2 Nominal size selection
Cv value calculation formula
<Steam>
>
P
When
2
≤
P
When
2
<Air>
>
P
When
2
≤
P
When
2
<Liquid>
. 0
365
=
Cv
∆
Cv: Cv value of each nominal size
W: Max. steam flow rate [kg/h]
Q: Max. gas flow rate [m
V: Max. liquid flow rate [m
P
: Inlet pressure [MPa·A]
1
P
: Outlet pressure [MPa·A]
2
Cv value
Nominal size
DP-100, DP-100F,
DP-100-D, DP-100F-D,
DP-100-C, DP-100F-C
Electric wiring work must be done by experienced professional.
1. If there is a risk of death, bodily injury or damage to property at the time of malfunction of the product,
be sure to install a suitable safety device that controls fluid flow interception/release or sounds an
alarm.
2. The product cannot be used as an emergency shutoff valve.
* The product is not designed as a safety valve such as an emergency shutoff valve. If the product
is applied to a system that needs safety measures, install other equipment besides the product to
ensure the safety.
3. The product is not explosion-proof. Do not use it in the area or ambience where explosive gases
accumulate.
* Using the product under the said conditions may cause fire.
4. Connect the cables only after confirming that no power is supplied.
* Failure to follow this notice may cause an electric shock.
5. Connect the cables according to the instructions after confirming the rated voltage.
* Erroneous cable connection may cause an electric shock or fire.
6. Do not supply electric power to the coil while it is detached from the valve.
* Failure to follow this notice may result in coil burnout or fire due to an overcurrent.
P
=
1
Cv
∆
2
138
P
Wk
Cv =
1
2
120
P
1
P
Q
=
1
Cv
2
2940
Q
(
273
P
=
1
Cv
2
2550
V
G
P
3
/h (standard condition)]
3
/h]
10A
15A
3.0
4.5
Wk
+
P
P (
P
)
1
2
+
(
273
) t
G
∆
+
P
P (
P
)
1
2
+
) t
G
P
1
∆P: P
– P
[MPa]
1
2
K: 1 + 0.0013 × {superheated steam temp.[˚C]
– saturated steam temp. [˚C]}
G: Specific gravity (relative to air for gas,
or relative to water for liquid)
20A
25A
32A
7.5
12.0
17.7
6. Installation
Warning
9
40A
50A
65A
25.0
33.6
33.6
■EPDT-247i■
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