The noise is coming from the drain line. The overflow is fine. The end of my drain line is submerged, and I don't hear much noise coming from that. Its mainly where the water falls straight down and hits the 90 elbow.
As far as check valves go I have never had one fail. If you drill holes at the end of the return pipe just below the surface just hope no algae grows on them or a snail happens to be on it when the power goes out
I have my exit just below the water surface and I have a George Fisher Wye check valve that can be disassembled and cleaned with a ball valve on both sides so it can be removed from the system and cleaned....maintenance is the key to a working check valve
here's a pic how its set up
<table style="width:auto;"><tr><td><a href="https://picasaweb.google.com/lh/photo/RSFF9d4U6YZmx-s4lYKmjtMTjNZETYmyPJy0liipFm0?feat=embedwebsite"><img src="https://lh6.googleusercontent.com/-85KgG8_50EA/UU9YItj4iwI/AAAAAAAAA1o/4gpduFyYT78/s144/check%2520valve.JPG" height="108" width="144" /></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:11px; text-align:right">From <a href="https://picasaweb.google.com/102378534454709043470/Sump?authuser=0&feat=embedwebsite">Sump</a></td></tr></table>
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