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A ball valve won't do anything for you, a check valve or one way valve will though.

I assume these are returns from an open sump type setup? If they're returns from a canister filter you have nothing to worry about anyway as overflowing would be impossible.

For the sump the best siphon break is a simple hole *just* below the desired waterline, that way it doesn't spray water during normal use, but only allows a minimal amount to flow out in the event of an outage, just be sure the hole stays clean - as in not clogged.
 

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Why not a closed-when-off solenoid? As in, power goes to 'noid, 'noid opens, water flows. Power outage occurs, 'noid closes, flow stops. Only issue here would be cost of a suitably sized 'noid. It's definitely something I'll be looking into, when I start planning my own in-wall...

Aside from this, are you using Durso/Stand-pipes? By design, these units will break a siphon once the water drops to the level of the open end of the Durso/Stand...
 
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