SailNet Community - View Single Post - Bilge pump non return valve.
View Single Post
  #13  
Old 11-13-2012
Classic30's Avatar
Classic30 Classic30 is offline
Once known as Hartley18
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,526
Thanks: 28
Thanked 42 Times in 42 Posts
Rep Power: 9
Classic30 will become famous soon enough Classic30 will become famous soon enough
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.
__________________
-
"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"
Reply With Quote Share with Facebook