Swinging pressure reducing valve in a real water distribution network: Where is the catch?

To reduce leakage in water distribution networks, several strategies have been developed, each addressing different aspects of the problem. Alongside advanced leak detection technologies, pressure control has proven to be one of the most powerful and widely implemented strategies to reduce leakage. In this perspective, a key technology in pressure management is the use of pressure reducing valves (PRVs). This paper presents field measurements showing significant instability (swing) of a PRV installed in a real pressure management area in Trieste (Italy). Such instability is characterized by very frequent and significant pressure variations. The various factors influencing this feature are pointed out, finding the catch of the problem and suggesting effective solutions.