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SIZING CONSIDERATIONS
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For the most comprehensive procedure in sizing Series 3330 control valves, it is best to use our ValveMaster software or the guidelines shown here in conjunction with the Performance Charts in the Engineering Section of the OCV catalog.
With rare exceptions, altitude valves are line sized. This being said, the following criteria may be applied.
The valve flow rate may be verified from the equation: |
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Q = flow rate, gallons per minute
Cv = valve flow coefficient from chart, below
dp = available pressure drop
Tank Fill - (system pressure minus tank head in psi)
Flow Out of Tank - (tank head in psi minus system pressure)
In no case should the flow velocity exceed 25 ft/sec (see chart). If a greater flow is required, use a larger valve.
In some cases, in may be necessary to limit the flow, particularly for flow into the tank. In such cases, consider using either a smaller valve or a line size valve with a pressure sustaining feature (Model 3331-3 or 3333-3). |
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