Join Date: Mar 2007
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Usually you wouldn't want a check valve in your primary bilge pumps. They are somewhat prone to failure/blockage, which can be very problematic in an emergency dewatering situation.
What some folks do is install a second, very low volume bilge pump, with a check valve immediately after the outflow exit. This pump, equipped with the check valve, can handle the little trickle amounts that end up in the bilge during the course of normal operations. And the check valve prevents most of the backflow from returning to the bilge when the pump shuts down.
It works best at keeping a bilge nearly completely dry if there is a small sump at the bottom of the bilge, where the last bits of water collect. Even without that small sump, it works better for drying the bilge than the high volume pumps, because they use small diameter hose that will not begin sucking air nearly so soon.
If you want to then take it another step further, you can raise your primary dewatering pump(s) up a bit off the bottom of the bilge. This way, they aren't constantly getting wet. And they should not have check valves!
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT