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On 6 Feb 2005 at 14:08, knowonelse@sbcglobal.net wrote: > Think of a river that flow with a constant volume, > and then widens into a lake. The damper behaves > like the lake. Fluctuations on the inlet side get > dampened by the lake taking up the variations > and leaving the outlet to run at a consitant rate. > > This prevents surges on the downstream side. That only works because the total lake volume can vary slightly. With a closed metal container and an incompressible fluid there's no such leveling. Personally, I would expect a length of rubber hose to have a greater effect, just because it is slightly elastic and should absorb small changes in volume as you described. OTOH, the pump is a roller pump, and I don't think these have significant pressure pulses anyway. The one I took apart was just completely empty and had been brazed together. I had wondered if it could have had something inside it when new, like a hollow rubber ball, but then how could they have brazed the body together? -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~