@user2684 How is your project going now? I am trying to use the same valves and diver board but I can not seem to get it to work. Could you answer some questions for me in order to help me get it to work.

Am i right in saying that if I connect the power leads of the valve to a + source (Li 18650 4.1v 2500ma) it should open the valve and the if I reverse the the leads it should close the valve?