Join Date: Jan 2003
Location: Maine Coast
Thanked 290 Times in 223 Posts
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Re: Bilge pump non return valve.
Originally Posted by MastUndSchotbruch
I experimented a bit with a check valve (NOT on a boat, actually, long story...). My experience was exactly what you describe, it got stuck in the 'closed' state at the drop of a hat.
BUT: I had never thought of doing what Hartley suggests:
"install it high up near the discharge point - not in the bilge with the pump itself"
In that case, you do NOT have the water column keeping the valve stuck in closed. That seems to me the smart way to do it (why didn't I think of that?).
Next time I have a chance, I will try that on my installation.
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....
-Maine Sail / CS-36T
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