Difference Between Solenoid Valve and Electric Valve

1. Actuation Method:

Solenoid valves are driven by an electromagnetic coil and can only perform on/off actions with very fast response times.

Electric valves typically use a motor for actuation, requiring more time to open or close, but allowing modulating (proportional) control.

2. Operating Characteristics:

Solenoid valves generally have small flow coefficients (Cv) and operate under low pressure differentials. For example, a 25mm solenoid valve often has a lower flow capacity than a 15mm motorized ball valve. Being coil-driven, solenoids are more vulnerable to voltage surges. They function strictly as switches—only fully open or fully closed.

Electric valves, driven by motors, are more resistant to electrical surges. Solenoid valves are ideal for small flows, low pressure, and high cycling applications, whereas electric valves suit larger flows and slower operations. Electric valves can achieve partial openings (e.g., 0%, 50%, 100%) to regulate flow—something solenoid valves cannot do.

Most solenoid valves automatically reset when power is cut; electric valves require an additional spring-return mechanism for this feature.

3. Application Suitability:

Solenoid valves are preferred for specialized requirements such as zero leakage or handling special media, though they tend to be more expensive.
Electric valves are commonly used for flow regulation and on/off control in applications like fan coil units.