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post #13 of Old 11-13-2012
Classic30
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Re: Bilge pump non return valve.

Quote:
Originally Posted by Maine Sail View Post
But that pretty much defeats the entire purpose of the check valve. A siphon break is still a choice that won't stick closed. If you are not preventing hose drain back then there is little point for a check valve...... Bilge pump hoses should always be installed to prevent back siphoning which includes a high loop and a siphon break....
Agreed, you need to prevent back siphoning which includes a high loop and a siphon break.. but you're quite wrong about having the check valve up high defeating the purpose. Hose drain back is irrelevant - it's, what, 1 litre of water max?

Think about what happens when you put the gunnel under on a flush-deck boat with the bilge pump exit out of the side just above the waterline - even with a high loop and a siphon break.

Boats have sunk because of that.

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"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
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