David, I didn't know the name but definitely recognized the design. The Bosworth is the type which I installed. I have one in the drain line for the port side head sink drain also. The 37+ owners regularly report that on strong starboard tacks the head sink will backup and over flow as a result of the drain piping going below the water line. I try to just keep the thru-hull closed but if I forget then the check valve is a good backup.
If you are getting forceful back flow in your bilge then I would suggest changing the discharge path/location of your bilge pump. A discharge just below the toe rail on the stern corner is good since it is very unlikely to become submerged under any circumstance. Unfortunately that could mean that those standing on the dock or swimming near by might get a surprise if/when the pump runs. If a lower location is selected then at least try to keep it as high off the water line as possible during all points of sail. In this case also route the hose to include a high point loop that gets as near the top center of the boat as possible to prevent a siphon. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Thu, Jul 23, 2020, 15:47 David Knecht via CnC-List <cnc-list@cnc-list.com> wrote: > That is the one I was looking at, so thanks for confirming. Not easy to > find, but Bosworth has a non-obvious direct order system where you can get > anything and their customer service was great. Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > > On Jul 21, 2020, at 9:50 AM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > Install a Bosworth Sea-Lect check valve or very similar. When you install > it orient it so the hinge on the valve is at the top. > > I've had one in Touche' for about 20 years with no issues. > > -- > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > On Tue, Jul 21, 2020 at 8:14 AM David Knecht via CnC-List < > cnc-list@cnc-list.com> wrote: > >> I had a periodic problem with water coming in the bilge pump under >> certain conditions. It seems that when the bilge pump outlet was under >> water, usually when motoring, water could flow under pressure through the >> bilge pump. This seemed not to be a siphon, but a water pressure situation >> since it stopped when the boat slowed down (making it difficult to >> diagnose, of course). I installed a check valve in the bilge pump line and >> the problem stopped for several years. It happened again last weekend >> while motor sailing in swells, so I am planning to replace the check >> valve. I vaguely remember someone suggesting a particular brand of check >> valve as working particularaly well, but I can’t find the post. Reviews I >> have seen on various sites have complaints about all of them, so hard to >> choose. I think I have the Whale no-return valve now. Anyone have a brand >> suggestion? Thanks- Dave >> >> David Knecht >> S/V Aries >> 1990 C&C 34+ >> New London, CT >> >> <pastedGraphic.tiff> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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