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Influence of reversing impact load on performance of a two-step unloading pilot-operated check valves

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Abstract

Reversing impact load conditions may cause severe vibration in large-flow pilot-operated check values (POCVs). Cavitation erosion may also occur in valve ports after long-term operation. To prevent cavitation erosion, improve the performance of POCVs, enhance working reliability, and performance stability thereof, firstly, the cavitation index and working principles of large-flow POCVs were introduced. Then, a theoretical model was established to analyse the flow field characteristics of a large-flow POCV. The flow field characteristics during the opening of the pilot poppet, and those under different load conditions, were investigated. Then an experiment was conducted to study the influence of controlling pressure on the impact characteristics, and the effect of impact load and controlling pressure on cavitation, through the use of a high-pressure impact bench. The results showed that the variation of controlling pressure had a minor effect on cavitation. With increasing controlling pressure, the vibration of the poppet decreased and the valve unloading capacities also decreased. The cavitation index showed a linear relationship with impact pressure, but was nonlinear with hydraulic flow under different impact parameters. It indicated that the variation of impact pressure exerted a significant influence on cavitation under reversing impact load conditions in POCVs, in particular, cavitation mainly occurred while the pilot poppet of the POCVs was fully open. Finally, pilot poppets with three different cone angles were designed, and experiments were carried to verify that the pilot poppet with a 45° cone angle was optimal.

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Acknowledgements

This work is supported by The Specialised Research Fund for Doctoral Programmes of Higher Education (20130095110012), Xuzhou Institute of Technology 2016 School Research Project (XKY2016224), and the Priority Academic Programme for the Development of Jiangsu Higher Education Institutions (PAPD).

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou, China

    Jiyun Zhao & Lei Liu

  2. School of Mechanical and Electrical Engineering, Xuzhou Institute of Technology, Xuzhou, China

    Lei Liu

Authors
  1. Jiyun Zhao
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  2. Lei Liu
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Correspondence to Jiyun Zhao or Lei Liu.

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Technical Editor: Kátia Lucchesi Cavalca Dedini.

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Zhao, J., Liu, L. Influence of reversing impact load on performance of a two-step unloading pilot-operated check valves. J Braz. Soc. Mech. Sci. Eng. 40, 295 (2018). https://doi.org/10.1007/s40430-018-1219-0

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  • DOI: https://doi.org/10.1007/s40430-018-1219-0

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