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The historical operating data of a globe valve which encountered a valve oscillation has been investigated. Combined with the vibration data from the field test, it is shown that the oscillation is firmly related with the turbulence flow in the valve channel. A computational fluid Dynamics (CFD) simulation has then been implemented to study the turbulent flow properties with two different valve trims. The results indicate that the modified balanced trim has a relatively better flow pattern and more balanced force is applied on the trim, compared with the existing trim with a pilot structure pattern. A finite element analysis (FEA) simulation with the results yielded from the CFD calculation has been carried out. It is found that increasing the stiffness of the pneumatic actuator spring could mitigate the oscillation of existing valves. The results of this work could be referred for the reasoning and modification of valve oscillation in globe control valves.

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Analysis on the Oscillation Causes and Modifications of a Globe Control Valve in a Nuclear Power Plant

  • 会议论文

  • 发表日期：

    2026年

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  • Yinli Liu,
  • Shuai Zhou,
  • Hongke Wang,
  • Lei Lin,
  • Changning Li,
  • Jianlong Kang,
  • Meng Gan

摘要

The historical operating data of a globe valve which encountered a valve oscillation has been investigated. Combined with the vibration data from the field test, it is shown that the oscillation is firmly related with the turbulence flow in the valve channel. A computational fluid Dynamics (CFD) simulation has then been implemented to study the turbulent flow properties with two different valve trims. The results indicate that the modified balanced trim has a relatively better flow pattern and more balanced force is applied on the trim, compared with the existing trim with a pilot structure pattern. A finite element analysis (FEA) simulation with the results yielded from the CFD calculation has been carried out. It is found that increasing the stiffness of the pneumatic actuator spring could mitigate the oscillation of existing valves. The results of this work could be referred for the reasoning and modification of valve oscillation in globe control valves.