The function of a pressure-reducing regulator is to reduce a pressure and keep this pressure as constant as possible while the inlet pressure and the flow may vary. There are different types of pressure-reducing regulators, but, when an application calls for maintaining consistent downstream pressures at high flows, it will most likely require the use of a dome loaded pressure-reducing regulator, instead of a spring loaded one. Even then, you may need to add external components to the regulator to achieve your desired performance. Your goal in doing so is to produce a reasonably flat flow curve for the regulator at a set pressure.
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