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OB-30, 30U, 31, 31U
OB-30·30U Nominal Size Selection Chart (For Steam)
How to use the chart
When selecting the nominal size of a temperature regulator whose inlet pressure (P
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.
OB-31·31U Nominal Size Selection Chart (For Water)
13
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
(0.3 MPa – 0.15 MPa) before and after the valve and the flow rate of 1 m
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.
-13
13
(a)
Nominal size
(b)
* Chart of the flow rate is a reference value.
P: Differential pressure MPa
3
/h, respectively, first find intersection point (a) of the differential pressure (ΔP) of 0.15 MPa
* Chart of the flow rate is a reference value.
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), outlet pressure (P
1
Nominal size
(a)
3
/h. Since this intersection point (a) lies between
), and steam
2
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