If I were you , I would install an anti-siphon loop first and then think of the check valve.
Most of us don’t sail in really heavy weather conditions, so this may not apply, but I read somewhere about an issue of flooding the engine with water (hydrolock) by the following seas. The guy ended up installing a manual cut-off valve on the exit of his exhaust to prevent it. I guess this would make sense only if you are making long enough passages. Marek 1994 C270 “Legato” Ottawa From: David Knecht via CnC-List Sent: Friday, May 22, 2015 9:12 AM To: CnC CnC discussion list Cc: David Knecht Subject: Stus-List Check valve on bilge pump We had a discussion a few years back about whether or not to have a check valve on the bilge pump outlet hose and as a result, I removed the valve from mine. All has been fine since. Yesterday, while motoring for a long ways down the river, I noticed that the bilge was filling with water. I pumped it out and the water immediately returned. I pulled the pump out of the bilge, and water was pouring into the bilge through the pump. When I lifted it, the flow stopped so it seemed to be siphoning/flowing through the bilge pump exit line, which is in the transom and when motoring, looks to be under water. I have not checked yet to see if there is an anti-siphon loop. I am guessing that this is one of the functions of the one way valve that was there before, but I can’t figure out why it never happened before. The Whale 500 pump does not specifically say it has a check valve, but perhaps it does and it stopped working? I had an oil spill into the bilge last winter and so maybe that is causing problems. I plan to reinstall a check valve in the line so this does not happen again. Any other thoughts? Thanks- Dave Aries 1990 C&C 34+ New London, CT -------------------------------------------------------------------------------- _______________________________________________ Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go to the bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
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