3 way valves and Simer pumps

I feel stupid... I just re-did my ballast system in hope of an easier design only to find out that the FlowRite V5 3 way valve wont' work with a a reversible self priming pump like the Simer. The pump actually pulls open the flapper on the closed side and sucks air when I am trying to emply one bag. In my system I use the 3 way valve to direct flow in and out of two different bags. I had been using a manual value and I replaced them with the V5 so I can do all the directing from the driver seat and not have to ask someone to "flip that valve, close that valve", etc.

Has anyone found a 'remote' 3 way value that do the job?

-Uj