Dynamic characteristics of a check valve for drain pumps

Kazuhide Mizobata, Hiromu Sugiyama, Kiyonobu Ohtani, Takashi Ohishi, Yuji Sasaki, Hiroyuki Musha, Toshio Miwa

Research output: Contribution to journalArticlepeer-review


Check valves for checking reverse water flows in drainage systems sometimes make large impacts through their sudden closure caused by accidental cutoff of drain pumps. In order to characterize such phenomena and to find design criteria for impactless check valves, we observed the motion of a check valve and measured its impact acceleration and pressures in the drainage pipe, using a subscale drainage system. Two peaks of impact acceleration were observed; The first one seemed due to collision of the check valve and the valve seat, whereas the second one did due to water column separation and recombination caused by the low pressure during the closure state of the valve. The former can be reduced by adding mass to the check valve and by setting an appropriate valve-seat angle. The latter possibly can be reduced by relaxing the low pressure during the closure. Subsequently, the check valve opened through the water-column recombination impacts and sometimes showed opening-closing oscillation.

Original languageEnglish
Pages (from-to)2225-2231
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number672
Publication statusPublished - 2002 Aug


  • Bubble
  • Check valve
  • Drainage
  • Multi-phase flow
  • Pipe flow
  • Water column separation


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