Pressure reducers are designed to reduce pressure in pressure pipes. We use it constantly, most often in the part where there are no users or networks of hydrants. The valve reduces the inlet pressure to a lower constant value, regardless of the flow through the valve and the pressure fluctuation on the inlet side of the valve.
Examples of recommended uses:
reducing the pressure in the distribution network, as a safety device that maintains the pressure in case of large consumption requirements, to ensure a constant flow in the tank (a calibrated hole with holes is added to the exit side).