Backflow Preventer Pressure Loss

Pressure loss interpolated from manufacturer-published curves.

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Formula and source

Linear interpolation of manufacturer pressure-loss curves by device class (RP / DCV / PVB / AVB) and pipe size.

Manufacturer technical bulletins (Watts Series 909 RP / 909 DCV / 800 PVB / Series 8 AVB) by name.

Audience

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Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.