www.pjoes.com/pdf/19.4/749-756.pdf i would like to learn about the calculations formulas involve in this mechanism. Any notes or formulas with explaination on the calculations of pressure loss, volumentric velocity, velocity, ect. will be very much helpful. In the pdf of the given link, the hydraulic loss coefficient was not clear to me. at the end results, i want to learn how to determine a right conical vortex regulator size when i have a wanted pressure loss, velocity ect. If there´s a price range for the conical vortex regulator according to size..it will be very much helpful too.