Here is an online calculator of the flow through the orifice. Using this chart you can determine both flow through existing orifice or estimate the orifice diameter for required flow.

value |
imperial |
metrical |
---|---|---|

Inlet pressure, p_{in}: |
psi |
bar |

Consumer's work pressure, p_{w}: |
psi |
bar |

Pressure drop across orifice, Δp=p_{in}−p_{w}: |
psi |
bar |

Required flow trough orifice, Q: | GPM |
LPM |

Oil Specific Gravity, SG: | See table for reference | |

Orifice coefficient, cd: | See table for reference | |

Orifice Diameter, D: | in |
mm |

**How to use this chart.**

Just change any values in the input fields, others will be re-calculated automatically.

Like an option, you can use Characteristic curves for calibrated orifices (PDF, 38Kb)

PabloDoes this calculation work also for lubrication oil, in a range between 50 and 70 deg C where the dynamic viscosity almost changes by a factor of 2?