Hmm, interesting. Have you sourced out the price for the valves. I guess the only ones suitable would be the plastic ones, as long as there as no internal parts that are metal exposed to the saltwater. From looking at the PDF files I couldn't determine. I note they have a rating of 10 p.s.i min. Is this because it needs some water pressure to help in the activation of the valves. If so then unsuitable as you won't find many hobby pumps that can put out that pressure.
I guess the main concern is can they handle the continous on and off cycling and do they make any noise when the solenoid is actuated.
One thing I note is replacement parts are available, which is a definite plus.
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-=Bryan=-
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