Not sure if yours is similar to the Orbit valve I works with before. The one I’ve seen before has a special plug with two holes. You can insert fairly thick wires into the holes and that would allow you to extend the wires:
https://2.bp.blogspot.com/_mhuuHR0dxnU/TBcdvYbna1I/AAAAAAAAEC4/ioNQaNWkZbU/s1600/IMG_1264.JPG
