Abstract
This paper is about some instabilities that have been observed during the testing procedure of a flow-control valve. It was observed that the complete closure of the valve was very often reached after a transient state with oscillating behaviour of its mobile element whose displacement was recorded by means of proximity sensors, facing on opposite sides the moving body of the valve. The outputs have been collected by two signal conditioning devices and sent to a dual channel spectrum analyser. Measurements have also been performed through a servo-accelerometer which has been fixed to the pipe. The influence of the pipe length on the behaviour of the system was studied. The oscillations recorded by the proximity sensors are fairly well reproduced by a series of square waves, with a number of low amplitude, strongly damped, higher frequency contents. During a single test the frequency of the oscillations is not a constant but increases in its central part. The phenomenon cannot be related to one of the natural frequencies of the piping system, that are much higher. The observed frequency depends on the length of the adduction pipe.
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References
Brunone, B., Golia, U.M., and Greco, M. (1995) Effects of two-dimensionality on pipe transients modeling, J. of Hydr. Eng. ASCE, 121 (12), 906–912.
Doeblin, E. O. (1990) Measurement Systems: Application and Design,McGraw-Hill, New York.
Fanelli, M. (1976) Bibliographie raisonnee sur: “Les resonances hydrauliques dans les circuits industriels”, ENEL - CRIS, Milano.
Fbllmer, B. and Zeller, H. (1980) The influence of pressure surges on the functioning of safety valves, Proc. of the Third Int. Conf on pressure surges, Canterbury, England, paper J2, 429–444.
Green, W.L. and Wood., G.D. (1980) The stability of direct acting spring loaded relief valves taking into account the upstream conditions, Proc. of the Third Int. Conf on pressure surges, Canterbury, England, paper G4, 45–62.
Orsi, E. (1994) Su un fenomeno di instabilità in valvole a limitazione flusso (in Italian), Proc. of the Seminar “Moto vario nei sistemi acquedottistici”, Ban, 72–75.
Press, W., Flannery, B., Teukolsky, S. and Vetterling, W. (1992) Numerical Recipes: The Art of Scientific Computing ( Second Edition ). Cambridge University Press, New York.
Tanda, M.G., and Zampaglione, D. (1991) Analisi di fenomeni di risonanza in un sistema distributore al termine di un’adduttrice a gravità: primi risultati (in Italian), Giomata di studio per la celebrazione del centenario della nascita di Girolamo Ippolito. Napoli.
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© 1996 Springer Science+Business Media Dordrecht
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Cigada, A., Guadagnini, A., Orsi, E. (1996). Instabilities in a Flow-Control Valve. In: Cabrera, E., Espert, V., Martínez, F. (eds) Hydraulic Machinery and Cavitation. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9385-9_48
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DOI: https://doi.org/10.1007/978-94-010-9385-9_48
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-9387-3
Online ISBN: 978-94-010-9385-9
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