AC sprinkler solenoids draw current continuously when they are energized. Typical values for larger solenoids are 350mA inrush current and 175mA hold current. So it take 350mA to pull the solenoid in. After the solenoid moves to the energized position, it take 175mA to hold it there.
There are DC solenoids for some battery operated equipment that are latching. However, all the AC systems are a much simpler non-latching version.