The 2 thru 8 inch (DN50 thru DN200) Model PRV-1 Pressure Reducing Valves are factory assembled and fully trimmed valve arrangements for pressure control. They are used on water filled pipe where it is necessary to reduce a higher inlet pressure to a lower delivery pressure under static and/or residual flowing conditions. The PRV-1 is intended to automatically maintain the outlet “set pressure” (static and residual) within a close range, regardless of fluctuations in the higher pressure inlet line or varying flow rates.