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we already use some pipe diameters before and after the RO (restriction orifice). the multistage device is used because we need to decrease pressure from 40 to 5 bar. this kind of devices are used to gradually decrease pressure

Hi! Thanks for your answer. This is what I tried at the first step, but I had to compare that results with other ones calculated as a multistage assembly and they didn't really match... Does anybody know how to calculate a multistage restriction orifice device?

thread124-150149 Hi all, I've been reading that thread about Restriction Orifices and I still have some doubts. In our case, we must design a multistage device, wich includes 3 restriction orifices in series. Is there any difference between multistage and simple restriction orifice...