# Valve Pressure Differential for Liquid

## Valve Pressure Differential for Liquid Formulas

\(\large{ \Delta P = SG \left( \frac{Q}{C_v} \right) }\) | (US units) |

\(\large{ \Delta P = SG \left( \frac{Q}{K_v} \right) }\) | (US units) |

### Where:

Units |
English |
Metric |

\(\large{ \Delta P }\) = valve pressure differential | \(\large{\frac{lbf}{in^2}}\) | \(\large{Pa}\) |

\(\large{ C_v }\) = valve flow coefficient (US units) | \(\large{ dimensionless }\) | |

\(\large{ K_v }\) = valve flow coefficient (SI units) | \(\large{ dimensionless }\) | |

\(\large{ Q }\) = valve flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |

\(\large{ SG }\) = specific gravity of liquid (water at 60°F = 1.0000) | \(\large{ dimensionless }\) |

Tags: Pressure Equations Differential Equations Valve Equations Valve Sizing Equations