maybe not a ball valve
I have not checked into this but maybe there is another valve type that you could use.
I do service work on commercial dishwashing equipment. These machines sometimes use a valve that has a servo actuated diaphram to close 1 outlet (say the outlet to the wash arms) while opening the other (the drain).
They typically have cast ABS or PVC bodies but I cannot attest to the materials used inside the valve. I can however guarantee that they are under $250 and usually operate on 120V.
I'll try to get some contact info at work tomorrow and post if I find anything out.
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