Control Valve Calculator: How to find the optimal valve dimension

Valve and pipe dimensions are still automatically selected to be the same by many installers, although a smaller valve dimension is often more advantageous for a precise flow. This online calculator helps you to calculate the best valve size for your installation.

Select the required valve type and pipe size and enter your process parameters. Then you can choose between different valve sizes. If the working range of the selected valve is optimal, you will see it, marked by two red lines, in the green area of the diagram. If not, please correct accordingly:

  • If the opening angle is in the front orange section (“vibration”), select a smaller valve size.
  • If the opening angle is in the back orange section (“cavitation”), select a bigger valve size.
  • If there is no red line in the graph, please check if the flow rate is within the range of the selected valve.

If you are not sure about the exact value of inlet pressure (P1) and outlet pressure (P2), we suggest to start with ΔP = 1 bar / 14.5 psi (ΔP = P1-P2).


Ms. Alexandra Kunze
Senior Marketing Executive
George Fischer Pte Ltd
11 Tampines Street 92
#04-01/07 Tampines Bizhub
528872 Singapore

alexandra dot kunze #at# georgfischer dot com