Hello everyone,

Now I am working on a vibration problem related to choke vale (reducing pressure from 325 bar to 80 bar) and the measurement from the site provides that after the choke valve NF is 2345 Hz and before the choke valve is 1500 Hz which is weird as there is no source for vibration before the choke valve. Do you have any idea from where this vibration (before choke valve) comes from and do you recommend any paper or reference which can help me in this problem and what is the possible solutions?

Thank you in advance