Which valve accessory component supplies electrical power to field devices?

• A. Data Loggers
• B. Grounding
• C. Power Supply
• D. Housings

Answer: (C)

Providing electrical power to field devices is the job of the power supply. It takes the available electrical source and converts it to the voltage and current the valve solenoids and related field electronics require, typically 24 VAC for irrigation valves, and delivers enough current to energize the coils when commanded. Without a power supply, the control signals from the controller won’t actuate the valves, even if the commands are correct. Data loggers serve to record data from the system, not to power devices. Grounding provides a safe path for fault currents and protects people and equipment, not power delivery. Housings simply protect components from the environment. In many designs, the power supply may be built into the controller or located in a valve box, but its primary function remains supplying the proper voltage and current to the field devices.