Please post a wiring diagram as it is wired now. You can draw it with pencil, and post a close-up photo of the diagram...
? about the ball valve. Does it have two ports or three. If only two, where does it exhaust to? Is it that it exhausts backwards into the inflation pump which isn't running at the time?
I dont understand the "three wire" aspect of your ball valve? I have some here that only have two wires. They require reversing the DC polarity to run the motor CW and CCW to open and close the valve, respectively.