Laboratory Analysis of a Piston-Actuated Pressure-Reducing Valve under Low Flow Conditions
| Autor: | Marco Franchini, Valentina Marsili, Stefano Alvisi, Riccardo Zarbo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Hydraulic engineering
Geography Planning and Development 0211 other engineering and technologies 0207 environmental engineering 02 engineering and technology Pressure regulator Aquatic Science Biochemistry Instability NO law.invention Piston lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 law 021105 building & construction pressure-reducing valve (PRV) laboratory analyses anomalies instability Pressure management Initial value problem PE8_3 020701 environmental engineering Water Science and Technology lcsh:TD201-500 geography geography.geographical_feature_category Mechanics Inlet Volumetric flow rate Flow conditions Environmental science |
| Zdroj: | Water Volume 12 Issue 4 Water, Vol 12, Iss 4, p 940 (2020) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12040940 |
| Popis: | The effectiveness of pressure-reducing valves (PRVs) for optimal pressure management of water distribution networks (WDNs) is proven, but problems and operational limitations have been highlighted by some recent experiences. In this study, we analyse the functioning of a piston-actuated pressure-reducing valve (PA-PRV) with a mechanical pilot which is subjected to low-flow regimes, a condition that is often observed in real water distribution networks. The analyses were carried out by means of laboratory tests featuring two sets of experiments, i.e., (a) by testing the behaviour of the PRV when a pre-established initial value and subsequent variation of flow rate occurs in the system and (b) by testing the PRV against a temporal series of flow rates observed at the inlet section of a real district metered area. The first set of tests showed that the PA-PRV tends not to maintain pressure at the imposed set-point and exhibits an unstable behaviour characterised by significant pressure oscillations under some flow rate conditions. The second set of laboratory tests showed that the anomalous behaviour identified in the first set of tests can occur under ordinary operational conditions of a network. |
| Databáze: | OpenAIRE |
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