So I have a contactor that I plan on plugging a 12 adapter into. And want to use a 12v relay to make a motorized valve open or close. Was hoping to get a dpdt relay that's always on unless powered side powers a 12v connection that goes to the "close valve" wire on the motorized valve, then use the always off unless powered side powers the "close valve" wire on it. Theirs a common wire, close valve, and open valve. It will stop powering the valve once fully open or closed and then the motorized valve will turn off. How can I set this up? I'm having trouble. P.s. it will run on dc or ac power.