I bought 2 solenoid valves. I'm looking to turn them on/off using my relay. However, I'm not sure what the best way to power them would be. Do I plug them directly into the wall (after attaching a wall connector to the wires)? 

I know wall outlets are 120V. So does that mean I need to get a converter?

EDIT: 
http://www.amazon.com/gp/product/B00827FP26
http://www.amazon.com/gp/product/B00004S1V2

Those are the solenoid valves I'm using.