To reintroduce appropriate pressure management to this water supply zone.

The existing flow meter and old PRV (figure 1) were surveyed for possible service and re-use. The valve was seized, again puttingit beyond economic repair.

Replace seized GA PRV with new 150mm (6”) diaphragm type PRV
Pressure logging has identified a possible 20-25 m reduction in pressure with some form of modulation at night
A 150mm Dorot PRV was purchased mated to a Fluid Controls hydraulic modulator with high pressure limitation pilot rail (figure 2).

As demonstrated in the charts below and in the next page: The volumetric reduction is 0.23 Mld (million
litres per day). Graph 1 - Pressure and Flow results illustrating post-commissioning of PRV and modulator.