Transient heat and collision impact of sealing pair of fast closing butterfly valve

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (5) : 75-82.

LI Shuxun1,2, YANG Lingxia1,2, LUO Xiangyao1,2, YIN Huiquan1,2

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Abstract

In order to accurately assess whether the structure is safe during the dynamic heating process, based on the classical Hertzian contact theory, rotation dynamics and collision and impact theory, numerical simulation methods are used to conduct transient thermal-structural coupling analysis and transient dynamics analysis of the fast-closing butterfly valve. The effects of different heating rates, different closing times and different sealing surface widths on the structural strength and seat sealing performance of the fast-closing butterfly valve are comparatively studied. Research shows that the final thermal stress and the contact pressure of the valve seat sealing surface of the fast-closing butterfly valve increase with the increase of the heating rate. When the heating rate of the inner wall of the valve is less than 0.225℃/s, the structural strength and sealing of the valve can meet the requirements ; Analyze the instantaneous impact speed of the fast-closing butterfly valve and the total displacement in the fast-closing process, and compare with the theoretically derived values, the error is within 5%. The impact of the fast-closing impact on the butterfly valve disc is greater than the valve seat. The impact law of impact speed and impact area key parameters on valve impact is shown.

Key words

fast closing butterfly valve / transient heat seal / heating rate / impact velocity / impact area

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LI Shuxun1,2, YANG Lingxia1,2, LUO Xiangyao1,2, YIN Huiquan1,2. Transient heat and collision impact of sealing pair of fast closing butterfly valve[J]. Journal of Vibration and Shock, 2022, 41(5): 75-82

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