Valve Pressure Differential for Liquid Formulas |
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\( \Delta P \;=\; SG \cdot \dfrac{ Q }{ C_v }\) (English units) \( \Delta P \;=\; SG \cdot \dfrac{ Q }{ K_v }\) (Metric units) |
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| Symbol | English | Metric |
| \( \Delta P \) = valve pressure differential | \(lbf \;/\; in^2\) | \(Pa\) |
| \( C_v \) = valve flow coefficient | \( dimensionless \) | \( dimensionless \) |
| \( K_v \) = valve flow coefficient | \( dimensionless \) | \( dimensionless \) |
| \( Q \) = valve flow rate | \(ft^3 \;/\; sec\) | \(m^3 \;/\; s\) |
| \( SG \) = liquid specific gravity (water at 60°F = 1.0000) | \(dimensionless \) | \( dimensionless \) |
