Which is the most common voltage requirement for the operation of a typical irrigation sprinkler system remote control valve?

• A. 12 Volt AC
• B. 24 Volt DC
• C. 24 Volt AC
• D. 12 Volt DC

Answer: (C)

Solenoids in irrigation valves are designed to be energized by 24 volts alternating current. This voltage level provides enough magnetic force to reliably move the valve plunger while keeping current on longer runs manageable, which is ideal for wiring valves from a single transformer through multiple controllers and relays. Because manufacturers standardize on this 24V AC setup, controllers, transformers, and valves are widely compatible, making it the most common configuration for typical remote-control irrigation valves. Other voltages exist in specialty systems, but they’re far less common due to compatibility and performance advantages of the 24V AC standard.