What feature of a solenoid valve allows it to operate remotely?

The feature that allows a solenoid valve to operate remotely is the electromagnetic coil that activates the valve. When an electric current passes through the coil, it generates a magnetic field that moves a plunger or armature within the valve. This movement opens or closes the valve, controlling the flow of fluid or gas in the system without the need for direct manual intervention.

This remote operation is particularly advantageous in automated systems, where valves can be controlled from a distance, improving efficiency and safety. The ability to apply electrical signals to activate the valve simplifies the control process, allowing for integration with control systems and sensors, which can monitor and adjust the system as needed.

In contrast, while a mechanical lever or a manual switch can control a valve, they require physical presence and direct interaction with the mechanism, which does not offer the same level of remote operation. A pressure gauge simply provides information about the system pressure and does not actively control the valve. Therefore, the electromagnetic coil is what fundamentally enables the remote operation of a solenoid valve.