What defines a remote control valve?

A remote control valve is defined as a valve that operates by an electrical signal from a controller. This type of valve allows for the automation of irrigation systems, enabling the user to control water flow from a distance, typically through an irrigation controller or timer. This automation enhances efficiency and convenience, allowing for scheduled watering without manual intervention.

In contrast, manually operated valves require physical effort to open or close, and hydraulic valves rely on the movement of pressurized fluid, which is not typical for most irrigation systems. Additionally, while some valves are designed to regulate water pressure, this is not the defining characteristic of a remote control valve, which primarily focuses on the method of operation through electrical signals. Thus, the correct response highlights the automatic and remote nature of the valve's function in an irrigation setup.