# Valve Flow Coefficient for Liquid

## Valve Flow Coefficient for Liquid Formulas

\(\large{ C_v = Q \sqrt {\frac {\Delta p} {SG} } }\) | (US units) |

\(\large{ K_v = Q \sqrt {\frac {\Delta p} {SG} } }\) | (SI units) |

### Where:

Units |
English |
Metric |

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

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

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

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

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

Tags: Coefficient Equations Flow Equations Valve Equations Liquid Equations Valve Sizing Equations