What is the valve controlling. If a gas and in choke condition, peak octave will be 1 to 2 K generally with a 6 to 9 dB drop off/octave as frequency decreases, 3 dB/octave for 4k & 8K. Not sure that this is what you are looking for. For gas under choke condition, valve size, etc. is of minimal...
I can help you with this.
Need the following information:
FLOWRATE IN LB/HR OR SIMILAR
RESERVOIR CONDIDITIONS (PRESSURE AND TEMPERATURE)
DISTANCE TO MEASUREMENT POINT OR RECEPTOR
ANY SPECIFIED LEVEL REQUIRED (AND PLEASE DON'T TELL ME 85 dB-A AT 3 FEET OR 1 METER).
Have not personally used either; however did get a report from SoundPlan about 5 years ago which said that the middle turbine oil cooler (there were 3 engines side-by-side) was approximately 20 dB-A louder than either of the other two. I can tell you from being at the site at the time the sound...