Yoshitake OB-30, Руководство пользователя

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13
-7
13
T
emperatur
e Regulator
Temperature Regulator
Step
2
Nominal Size Selection for Temperature Regulator

Calculation formula for Cv value
(1) For steam
When
P
2
> P
1
2 Cv =
Wk
138 ΔP(P
1
+ P
2
)
When P
2
P
1
2 Cv =
Wk
120P
1
(2) For liquid
Cv = 0.365V
G
ΔP
W : Max. flow rate of steam [kg/h]
P
1
: Inlet pressure [MPa ∙ A]
P
2
: Outlet pressure [MPa ∙ A]
ΔP : P
1
- P
2
[MPa]
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
3
/h]
Cv : Cv value of each nominal size

Cv value table
Nominal size
Model
15A 20A 25A 32A 40A 50A 65A 80A 100A 125A 150A
OB-30, 31 0.8 1 1.2 − − − − − − − −
OB-2000 5.0 7.2 10.9 14.3 18.8 32 54 70 108 − −
OB-1, 1G 2 2 4 7 10 − − − − − −
OB-2, 2G 2 2 4 7 10 14 21 27 42 72 94
OB-3, 3G 2 2 4 7 10 − − − − − −
OB-4, 4G 2 2 4 7 10 14 21 27 42 72 94
OB-5 1 1 2 − − − − − − − −
OB-6 1 1 2 − − − − − − − −

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.