Fluid pressure penetration for advanced FEA of metal-to-metal seals

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Abstract

This numerical study investigates the behaviour of the contact faces in the metal-to-metal seal of a typical pressure relief valve in the commercial FE-package ANSYS. The valve geometry is simplified to an axisymmetric problem, which comprises a simple representative geometry consisting of only three components. A cylindrical nozzle, which has a valve seat on top, contacts with a disk, which is preloaded by a compressed linear spring. Analysis considerations include the effects of the Fluid Pressure Penetration (FPP) across the valve seat which exists at two different scales. In-service observations show that there is certain limited fluid leakage through the valve seat at operational pressures about 90% of the set pressure, which is caused by the fluid penetrating into surface asperities at the microscale. At the macroscale, non-linear FE-analysis using the FPP technique available in ANSYS revealed that there is also a limited amount of fluid penetrating into gap, which is caused primarily by the global plastic deformation of the valve seat. Accurate prediction of the fluid pressure profile over the valve seat is addressed in this study by considering the FPP interaction on both scales. The shape of this pressure profile introduces an additional component of the spring force, which needs to be considered to provide a reliable sealing.
Original languageEnglish
Pages (from-to)197-198
Number of pages2
JournalProceedings in Applied Mathematics and Mechanics, PAMM
Volume15
Issue number1
DOIs
Publication statusPublished - 21 Oct 2015
Event86th Annual Meeting of the International Association of Applied Mathematics and Mechanics, GAMM 2015 - Grand Hotel Tiziano, Lecce, Italy
Duration: 23 Mar 201527 Mar 2015
Conference number: 2015
http://conference.unisalento.it/ocs/index.php/gamm/gamm2015

Keywords

  • metal-to-metal seal
  • pressure relief valves
  • fluid pressure penetration
  • FEA
  • axisymmetric problem
  • static face seals

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  • Modelling of metal-to-metal seals in a pressure relief valve using advanced FE analysis

    Gorash, Y., Dempster, W., Nicholls, W. & Hamilton, R., 21 Apr 2015. 12 p.

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  • Modelling of metal-to-metal seals in a pressure relief valve using advanced FE-analysis

    Gorash, Y., Dempster, W., Nicholls, W. & Hamilton, R., 21 Apr 2015, Surface Effects and Contact Mechanics including Tribology XII: Proceedings of Contact and Surface 2015 Conference. de Hosson, J. T. M., Hadfield, M. & Brebbia, C. A. (eds.). Southampton: WIT Press, Vol. 91. p. 247-258 12 p. (WIT Transactions on Engineering Sciences; vol. 91, no. XII).

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