Yoshitake OB-30 Manual page 28

OB-4, 4G
OB-4,4G Nominal Size Selection Chart (For Water)
Nominal size
(a)
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ΔP: Differential pressure MPa
How to use the chart
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When inlet pressure is 0.3 MPa, outlet pressure is 0.15 MPa, and flow rate is 9 m /h, first find
the intersection point (a) with the differential pressure (ΔP) 0.15 MPa (0.3 MPa – 0.15 MPa)
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before and after valve and the flow rate 9 m /h. Since this intersection point (a) locates between
nominal sizes 32A and 40A, select the larger one, 40A.
* Chart of the flow rate is a reference value.
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