FieldengFluid & Pressure
Valve Pressure Drop
Incompressible valve ΔP from US Cv: Q_gpm = Cv √(ΔP_psi / SG).
Fluid & Pressure
Incompressible valve ΔP from US Cv: Q_gpm = Cv √(ΔP_psi / SG).
App id: FLUID-13. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
ΔP_psi = SG (Q_gpm / Cv)²Inputs
| Name | Unit |
|---|---|
| Volumetric flow | gpm |
| Valve Cv | 1 |
| Specific gravity | 1 |
Outputs
| Name | Unit |
|---|---|
| Pressure drop (hero result) | psi |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
Every result | US Cv convention | info |
Assumptions
- Cv is the US customary coefficient (gpm of water at 1 psi).
- Not valve authority, cavitation, or compressible-gas sizing.
Provenance
- ISA/US Cv liquid sizing. Liquid, turbulent, no flashing.