Pressure relief valves in water pipes are known to sometimes chatter when the inlet pressure slightly exceeds the set pressure. While these devices are responsible for numerous fatigue issues in process industries, there is a relatively low number of technical publications covering their performance, especially in heavy fluid applications. The present study is intended as a contribution to the understanding of pressure relief valve dynamics, taking into account fluid-structure interactions. A series of tests were performed with a water relief valve in a test rig. Adjusting the set pressure of the valve to about 30 bars, an upstream pressure varying from 20 bars to 35 bars was imposed, so that the valve opened and the water flow varied from a few to about . During the tests, the pipe was equipped upstream and downstream of the valve with static pressure sensors and a flowmeter, the disk lift was measured with a laser displacement sensor, and the spring force was recorded simultaneously. Several fluctuating pressure sensors were also installed in the inlet pipe. Static instability is investigated by comparing the spring force to the hydraulic force. Dynamic instability is observed and it is shown that the resonant behavior of the disk generates an apparent negative pressure drop coefficient at some frequencies. This negative pressure drop coefficient can trigger a dynamic instability in a manner similar to the negative damping effect in leakage-flow vibrations.
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August 2010
Research Papers
Instability of Pressure Relief Valves in Water Pipes Available to Purchase
G. Brasseur,
G. Brasseur
Department of Analysis in Mechanics and Acoustics,
e-mail: [email protected]
EDF R&D
, F-92141 Clamart, France
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Ch. Teygeman,
Ch. Teygeman
Department of Materials and Mechanics of Components,
e-mail: [email protected]
EDF R&D
, F-77818 Moret-sur-Loing, France
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J. Ferrari,
J. Ferrari
Department of Materials and Mechanics of Components,
e-mail: [email protected]
EDF R&D
, F-77818 Moret-sur-Loing, France
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J. F. Rit
J. F. Rit
Department of Materials and Mechanics of Components,
e-mail: [email protected]
EDF R&D
, F-77818 Moret-sur-Loing, France
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P. Moussou
R. J. Gibert
G. Brasseur
Department of Analysis in Mechanics and Acoustics,
EDF R&D
, F-92141 Clamart, Francee-mail: [email protected]
Ch. Teygeman
Department of Materials and Mechanics of Components,
EDF R&D
, F-77818 Moret-sur-Loing, Francee-mail: [email protected]
J. Ferrari
Department of Materials and Mechanics of Components,
EDF R&D
, F-77818 Moret-sur-Loing, Francee-mail: [email protected]
J. F. Rit
Department of Materials and Mechanics of Components,
EDF R&D
, F-77818 Moret-sur-Loing, Francee-mail: [email protected]
J. Pressure Vessel Technol. Aug 2010, 132(4): 041308 (7 pages)
Published Online: August 5, 2010
Article history
Received:
October 8, 2009
Revised:
July 7, 2010
Online:
August 5, 2010
Published:
August 5, 2010
Citation
Moussou, P., Gibert, R. J., Brasseur, G., Teygeman, C., Ferrari, J., and Rit, J. F. (August 5, 2010). "Instability of Pressure Relief Valves in Water Pipes." ASME. J. Pressure Vessel Technol. August 2010; 132(4): 041308. https://doi.org/10.1115/1.4002164
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