Common 11 – Pressure Reducing Valves (PRVs)
Pressure Reducing Valves are used to limit the pressure in the lower parts of a system.
The pressure at the outlet points of this system would be high, about 70 psig at node N3, and 92 psig at node N5, if the pressure reducing valves were not included.
To reduce pressure at the lower elevations, PRV's have been included at the end of pipes P1 & P3. PRVs can help provide reduced likelihood of leakage at pipework joints in the lower parts of the system.
NOTE: The PRV cannot add pressure. If the PRV pressure setting is higher than the maximum pressure that would occur at the following node then the system will not be solved.