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Well, I didn't end up using any valves etc, since I was going straight to a grey-water sump. I don't see why you couldn't use one though. My drain is a very simple collection of PVC elbows and sweeps that I used simply so that I could have a small "trap" which would hold a bit of cold water in the hopes that it would help keep the cold air from flowing out the drain. I don't honestly know if it helps at all or not.
I think this photo says about everything there is to say, really:
As for the PVC ball valve, I have no experience with them?but the sink drain isn't exactly a critical item, so if it broke, you could remove it without it being the end of the world, I suppose.
