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6.1 Nominal size selection chart
■ For water (Cv = 1)
First calculate pressure loss ∆P and then find flow rate V in the above chart. Secondly, multiply the flow
rate V by Cv value for each model.
[Example]
Model: DD-3 (Cv value: 1.7)
•
Inlet pressure (P
•
Outlet pressure (P
•
Pressure loss is calculated as ∆P = P
by the dashed lines in the above chart. Next, multiply V = 14 L/min by the Cv value of 1.7.
Therefore:
6. Nominal Size Selection
∆P: Pressure loss (MPa)
):
0.15 MPa
1
): 0.05 MPa
2
- P
= 0.1 MPa. Then, find the flow rate V = 14 L/min as shown
1
2
14 L/min x 1.7 = 23.8 L/min
4
■EPDT-251b■
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