What risk occurs if both solenoids on an AC double solenoid valve become actuated simultaneously?

When both solenoids on an AC double solenoid valve become actuated at the same time, the system encounters a situation where the magnetic fields created by each coil counteract one another. This dual activation can lead to a condition where the plunger is held in a position where neither solenoid can properly take control.

In this scenario, the last coil that was energized can overheat or burn out due to the inability to draw in the plunger. Essentially, since both coils are energized simultaneously, the magnetic forces do not function effectively to allow one solenoid to succeed in pulling the plunger into the activated position. The last coil may attempt to pull the plunger but cannot achieve its task due to the opposing force from the first coil that is still energized. Without being able to move the plunger, the coil continues to draw current, resulting in overheating and potentially leading to the solenoid burning out.

This understanding emphasizes the importance of correct sequencing and operation of solenoids in control systems to prevent such conflicts, ensuring that only one solenoid is energized at any given time to avoid mechanical failures.