A standard pressure reducing valve (PRV) is familiar to most users worldwide. For a utility that is undertaking pressure management and establishing DMAs, this is often an excellent selection. This valve has typically one pilot and one pressure setting. Operators manually set the pilot to the one pressure they desire downstream and that is the pressure they get. Downstream pressure setting is maintained as a constant regardless of varying upstream pressures or flow rates. This style of valve needs a differential pressure of 10 psi or .6 bar between the inlet and outlet of the valve to function effectively. To change pressure, the operator must adjust the valve manually by changing the pressure setting on the pilot. This style of valve works very well with medium to high system pressures. If available pressure differential drops below 10 psi (.6 bar), pressure reducing valves can not open fully and, as the available pressure drop is further reduced, flow approaches zero.

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