Don Lowther wrote: > Thank you everyone for your feedback and suggestions. > Over the weekend I emailed the pump manufacturer "Rule" explaining my set-up > and the problem it was having overcoming the check valve. I'll forward their > answer below, makes perfect sense of course: > > Good day Don, > > Both Rule and our competitors' centrifugal style bilge pumps have very > little air vacuum pressure because there is a large gap (depending on > the pump, it could range between 1/16"-3/16") which allows high flow and > some bilge debris to flow past the impeller without damaging the unit. > > The negative side of the having the large gap between the housing and > the impeller is the impeller needs to come in contact with water to pull > the water out of the bilge (water being a lot thicker than air). > > The check valve at the end of the bilge hose seals air in the hose and > will not allow the water to come in contact with the impeller. The pump > may be in a few inches of water (or completely submerged) but because of > the air pocket, the pump cannot remove the water from the bilge. > > A generic remedy is to remove the check valve and put a curly-que (sorry > for the lack of technical terminology) in the line and that will keep > some of the water from flowing back into the bilge. [snip] Sooo, in a nutshell ... it loses its prime, and the check valve on the _exit_ prevents it from getting air/water out? I'm wondering: "What's a curly-que?" Am I missing something? Wouldn't a check valve on the input side, and a free opening on the exit also solve the problem here, once the pump is primed? Or, is it the check valve on the input side that is the problem? -- Dave Kruger Astoria, OR *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Wed Jan 03 2007 - 05:14:41 PST
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