www.yoshitake.jp
13
-13
13
T
emperatur
e Regulator
OB-30, 30U, 31, 31U
OB-30·30U Nominal Size Selection Chart (For Steam)
(a)
(b)
W: Flow rate kg/h
P
2
: Outlet pressure MPa
W: Flow rate kg/h
P
2
: Outlet pressure MPa
P
1
: Inlet pressure MPa
Nominal size
How to use the chart
When selecting the nominal size of a temperature regulator whose inlet pressure (P
1
), outlet pressure (P
2
), and steam
flow rate are 0.2 MPa, 0.15 MPa, and 20 kg/h, respectively, first find intersection point (a) of the inlet pressure of 0.2
MPa and the outlet pressure of 0.15 MPa. Trace down vertically from this intersection point (a) to find intersection point
(b) with the flow rate of 20 kg/h.
Since this intersection point (b) lies between nominal sizes 15A and 20A, select the larger one, 20A.
* Chart of the flow rate is a reference value.
OB-31·31U Nominal Size Selection Chart (For Water)
(a)
P: Differential pressure MPa
V: Flow rate m
3
/h
Nominal size
How to use the chart
When selecting the nominal size of a temperature regulator whose inlet pressure, outlet pressure, and flow rate are
0.3 MPa, 0.15 MPa, and 1 m
3
/h, respectively, first find intersection point (a) of the differential pressure (ΔP) of 0.15 MPa
(0.3 MPa – 0.15 MPa) before and after the valve and the flow rate of 1 m
3
/h. Since this intersection point (a) lies between
nominal sizes 15A and 20A, select the larger one, 20A.
· When the OB-30 or OB-30U is used and the fluid is hot water, use the selection chart shown above.
* Chart of the flow rate is a reference value.
