valve that prevents backflow

[myse7en]

what's the name of the valve that will prevent backflow in case power goes out? thanks guys

 

[viper_930]

It's a check valve, but do not rely on them to stop your sump from overflowing. Check valves aren't dependable and even with a swing check valve it may slowly trickle water down into the sump slowly. You should still drill an air hole at the top of your return just in case. I have a swing check valve on my return just so the water level doesn't drop when I turn off the pump for feeding, but I made sure my sump won't overflow if the valve fails.

 

[dawman]

My return lines go above the water level so one thing that worked for me . But my sump is too small to hold the water when the power goes out and would overflow . I ended up using two bulkhead fittings and piped an overflow line near the top of my sump to a plastic tub [still inside my stand] so the few extra gallons flow into it and not the floor . I have a small power head in the tub with tubing going into the sump to pump the water back into the system if needed . Right after I did this , a week later we lost power for a few hours which tested out very well .