A Study on Water Hammer by Check Valve in Water Supply Piping System : Part 2-Numerical Study and Survey on Water Hammer by Check Valves

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  • 逆止弁による管路系の水撃作用の解析 : 第2報-数値計算と実測による水撃作用の検討
  • 逆止弁による管路系の水撃作用の解析-2-数値計算と実測による水撃作用の検討
  • ギャクドメベン ニ ヨル カンロケイ ノ スイゲキ サヨウ ノ カイセキ 2

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Abstract

This paper analyzes water hammer caused by a check valve by using a numerical solution with the characteristics method. A comparison is made on the relationship among the experimental results (Ref. Part 1), actual surveyed results and calculated results. The results are summarized below; 1) The characteristics of a check valve closed by spring force depend on time. On the other hand, those of a check valve closed by gravity depend on the flow velocity, and the check valve is closed suddenly after a counter current. 2) The closing time from the point of shut off of electricity to the onset of pressure rising (Pt.C) depends on the start time of the counter current, and the time from Pt.C to the point of the first peak depends on the wavespeed. 3) The maximum pressure rising rate depends on not only the closing time but also the magnitude of the counter current and the pattern of flow velocity. 4) Some differences are found between the actual survey results and the experimental results, and they seem to be caused by the effects of total pipe length and characteristics of pump. 5) The calculated pressure waves agree with the actual survey results and the experimental results.

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