Q = C * √ΔP

Q = desired flow

C = valve flow rate (from table below)

ΔP = psi

Example:

For a 3" valve C = 170 gpm at 1 psi

Let's say that you want to know what the flow rate is at

a pressure of:

Δp = 0.85

and

Δp = 3

For the first psi of 0.85:

Q = 170 *√0.85 = 156.74 gpm

For the second psi of 3:

Q = 170 *√3 = 294.45 gpm

Asepco Valve Cv's (at 1 psi):

0.5" |
02.8 gallons per minute (gpm) |
10.6 liters per minute (lpm) |

1.0" |
15.8 gallons per minute (gpm) |
60 liters per minute (lpm) |

1.5" |
32.0 gallons per minute (gpm) |
121 liters per minute (lpm) |

2.0" |
72.0 gallons per minute (gpm) |
273 liters per minute (lpm) |

3.0" |
170 gallons per minute (gpm |
643 liters per minute (lpm) |

4.0" |
302 gallons per minute (gpm) |
1143 liters per minute (lpm) |