Switching between +9V and -9V (using 5V logic)
You can use two SPDT relays to select +9 or -9 or 0V. 

Both energized = off, Both de-energized = off, and if one is energized and the other is not it will drive the actuator in one direction or the other. 







simulate this circuit &ndash; Schematic created using CircuitLab

To suppress electrical noise, add a bridge rectifier (W04G, for example) across the actuator (the AC input terminals) and connect the + terminal to +9 and the - terminal to 0V