Solenoid Valve

A Solenoid Valve is an electromechanically operated valve. In burner systems, it serves as the primary safety shut-off device, automatically opening to allow fuel flow when energized and closing instantly when de-energized.

Safety Function (Class A Safety Valve)

The most critical characteristic of a burner solenoid valve is its Normally Closed (NC) operation.

• Energized (Powered): The magnetic coil lifts the plunger, opening the valve and allowing fuel to flow.
• De-energized (Power Cut): A spring forces the plunger down, sealing the valve closed.

This ensures that if there is a power failure, flame failure, or any safety interlock trip, the fuel supply is immediately and mechanically cut off.

Multi-Stage Valves

Some solenoid valves are "Multi-Stage" or "Modulating":

• 1st Stage: Opens partially for ignition or low fire.
• 2nd Stage: Opens fully for high fire.