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Temperature Regulator
Nominal Size Selection for Temperature Regulator
Calculation formula for Cv value
(1) For steam
P
1
When P
>
2
2
P
1
When P
2
2
(2) For liquid
0.365V G
Cv =
Cv value table
Nominal size
Model
OB-30, 31
OB-2000
OB-1, 1G
OB-2, 2G
OB-3, 3G
OB-4, 4G
OB-5
OB-6
Point to remember when selecting the size
∙ If system has small capacity and seat leakage become a problem, select single valve type such as OB-30 Series, OB-5 or OB-6.
∙ Differential pressure between inlet and outlet of temperature regulator should be 0.05 MPa in principle. It is recommended that inlet
pressure be 0.2-0.3 MPa to obtain the best performance of the temperature regulator and its longer product life.
13
-7
13
Wk
Cv =
138 ΔP(P
+ P
)
1
2
Wk
Cv =
120P
1
ΔP
15A
20A
25A
0.8
1
1.2
5.0
7.2
10.9
2
2
4
2
2
4
2
2
4
2
2
4
1
1
2
1
1
2
W : Max. flow rate of steam [kg/h]
P
: Inlet pressure [MPa ∙ A]
1
P
: Outlet pressure [MPa ∙ A]
2
ΔP : P
- P
1
k
: 1 + 0.0013 x {superheated steam temperature [˚C]
– saturated steam temperature [˚C]}
G : Specific gravity (against water in the case of fluid)
V : Max. flow rate of fluid [m
Cv : Cv value of each nominal size
32A
40A
50A
65A
−
−
−
−
14.3
18.8
32
54
7
10
−
−
7
10
14
21
7
10
−
−
7
10
14
21
−
−
−
−
−
−
−
−
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[MPa]
2
3
/h]
80A
100A
125A
150A
−
−
−
70
108
−
−
−
−
27
42
72
−
−
−
27
42
72
−
−
−
−
−
−
Step
2
−
−
−
94
−
94
−
−
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