| 摘要 |
<p>PURPOSE: To provide a buffering device effective not only for primary water hammer, but also for secondary water hammer caused through repulsion by forming a second airtight chamber continued to a first airtight chamber across a partition wall which has large diameter communication holes freely communicated through check valves, and a small diameter communication hole always communicated. CONSTITUTION: An elastic body 2 is fixed to a main pipe 1 over a range provided with through-holes 11 of the pipe 1, for covering all of them in a steady state. A first airtight chamber 3 is a structural body fixed to an outer peripheral surface of the main pipe 1, and continued to a second airtight chamber 5 across a partition plate 4. The first airtight chamber 3 is communicated with the second airtight chamber 5 through bilateral large diameter communication holes 41 and a center small diameter communication hole 42 on the partition plate 4. A check valve 51 is provided on the side of the second airtight chamber 5 of each of the large diameter communication holes 41. In a usual state, the large diameter communication hole is closed by the self weight of the check valve. When pressing force is energized from a lower side exceeding the self weight, the large diameter communication hole 41 is opened through rotation of the valve.</p> |
