Originally Posted by Maine Sail
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....
Of course you are entirely right, as far as boats and bilges are concerned.
I know I may be a bit off-topic here, this being sailnet, but as I mentioned, my application is not on a boat. I need to pump some water uphill but in my case there is no possibility that a siphoning situation develops. My problem is only that the hose is long, and the water that runs back will cycle the pump again. If I can prevent the hose emptying (or at least slow it down significantly), that will solve the cycling problem.
Seems to me that for my particular situation, a check valve close to the top end might solve the problem. Glad I read this thread, I never had thought about it.