I’d suggest to use ...
Published by Muhammad Alfalah Fauzi, CFD Engineer Intern at Institut für Wasserbau und Technische Hydromechanik (IWD) - TU Dresden
I’d suggest to use peristaltic pump and use valve or increase the height of pipe downstream the pump to regulate the pressure. You can use PRV but note that there is a risk of being clogged and solid deposit formed which will deteriorate the PRV performance although you install strainer at the PRV inlet.