Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

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Abstract

This paper presents a numerical study involving the deformation of contact faces in the metal-to-metal seal in a typical pressure relief valve. The valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only 3 components. A cylindrical nozzle, which has a valve seat on top, contacts with a disk, which is preloaded by a compressed linear spring. All the components are made of AISI type 316N(L) steel defined using the multilinear kinematic hardening model based on monotonic and cyclic tests at 20°C. In-service observations show that there is a 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. Nonlinear FEA in ANSYS using the fluid pressure penetration (FPP) technique revealed that there is a limited amount of fluid penetrating into gap, which is caused by the plastic deformation of the valve seat at the macroscale. Prediction of the fluid pressure distribution over the valve seat just before the valve lift is addressed in this study considering the FPP interaction on multiscale. This is the principal scope, since it allows adjustment of the valve spring force in order to improve the leak tightness.
LanguageEnglish
Pages61-74
Number of pages14
JournalJournal of Loss Prevention in the Process Industries
Volume43
Early online date23 Apr 2016
DOIs
Publication statusPublished - 1 Sep 2016

Fingerprint

Pressure relief valves
valves (equipment)
seats
Pressure
Fluids
Metals
Geometry
Steel
Leakage (fluid)
metals
Biomechanical Phenomena
Pressure distribution
Plastics
Seals
Hardening
Nozzles
Plastic deformation
nozzles
Kinematics
steel

Keywords

  • contact
  • finite element analysis
  • metal-to-metal seal
  • plasticity
  • safety valve
  • type 316 steel

Cite this

@article{1f1c9582ed3e4b89bb8eee0b4c3d2407,
title = "Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis",
abstract = "This paper presents a numerical study involving the deformation of contact faces in the metal-to-metal seal in a typical pressure relief valve. The valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only 3 components. A cylindrical nozzle, which has a valve seat on top, contacts with a disk, which is preloaded by a compressed linear spring. All the components are made of AISI type 316N(L) steel defined using the multilinear kinematic hardening model based on monotonic and cyclic tests at 20°C. In-service observations show that there is a 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. Nonlinear FEA in ANSYS using the fluid pressure penetration (FPP) technique revealed that there is a limited amount of fluid penetrating into gap, which is caused by the plastic deformation of the valve seat at the macroscale. Prediction of the fluid pressure distribution over the valve seat just before the valve lift is addressed in this study considering the FPP interaction on multiscale. This is the principal scope, since it allows adjustment of the valve spring force in order to improve the leak tightness.",
keywords = "contact, finite element analysis, metal-to-metal seal, plasticity, safety valve, type 316 steel",
author = "Yevgen Gorash and William Dempster and Nicholls, {William D.} and Robert Hamilton and Anwar, {Ali A.}",
year = "2016",
month = "9",
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doi = "10.1016/j.jlp.2016.04.009",
language = "English",
volume = "43",
pages = "61--74",
journal = "Journal of Loss Prevention in the Process Industries",
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T1 - Study of mechanical aspects of leak tightness in a pressure relief valve using advanced FE-analysis

AU - Gorash, Yevgen

AU - Dempster, William

AU - Nicholls, William D.

AU - Hamilton, Robert

AU - Anwar, Ali A.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - This paper presents a numerical study involving the deformation of contact faces in the metal-to-metal seal in a typical pressure relief valve. The valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only 3 components. A cylindrical nozzle, which has a valve seat on top, contacts with a disk, which is preloaded by a compressed linear spring. All the components are made of AISI type 316N(L) steel defined using the multilinear kinematic hardening model based on monotonic and cyclic tests at 20°C. In-service observations show that there is a 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. Nonlinear FEA in ANSYS using the fluid pressure penetration (FPP) technique revealed that there is a limited amount of fluid penetrating into gap, which is caused by the plastic deformation of the valve seat at the macroscale. Prediction of the fluid pressure distribution over the valve seat just before the valve lift is addressed in this study considering the FPP interaction on multiscale. This is the principal scope, since it allows adjustment of the valve spring force in order to improve the leak tightness.

AB - This paper presents a numerical study involving the deformation of contact faces in the metal-to-metal seal in a typical pressure relief valve. The valve geometry is simplified to an axisymmetric problem, which comprises a simple geometry consisting of only 3 components. A cylindrical nozzle, which has a valve seat on top, contacts with a disk, which is preloaded by a compressed linear spring. All the components are made of AISI type 316N(L) steel defined using the multilinear kinematic hardening model based on monotonic and cyclic tests at 20°C. In-service observations show that there is a 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. Nonlinear FEA in ANSYS using the fluid pressure penetration (FPP) technique revealed that there is a limited amount of fluid penetrating into gap, which is caused by the plastic deformation of the valve seat at the macroscale. Prediction of the fluid pressure distribution over the valve seat just before the valve lift is addressed in this study considering the FPP interaction on multiscale. This is the principal scope, since it allows adjustment of the valve spring force in order to improve the leak tightness.

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KW - plasticity

KW - safety valve

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