Solenoid Valve
The gatekeeper of fuel. Solenoid valves are the primary safety shut-off devices in the fuel train, ensuring fuel flow is instantly stopped when the burner shuts down or locks out.
Function & Safety
A solenoid valve is an electromechanically operated valve. In burner systems, they are almost exclusively "Normally Closed" (NC), meaning they require power to open and will close automatically via spring force if power is lost.
For gas burners, these valves must comply with strict standards (like EN 161 in Europe). Safety shut-off valves are typically Class A, meaning they have the highest sealing tightness and a closing time of less than 1 second.
Common Configurations
Single Stage
Simple on/off operation. Opens fully when energized. Used for small burners or pilot lines.
Double Block (Multi-Bloc)
Two valves integrated into a single housing (Safety + Control). Reduces piping space and leak points. Example: Dungs DMV.
Slow Opening
Hydraulic damping slows the opening speed (up to 20s) to allow a smooth, soft ignition. Closing is always instantaneous (<1s).
High / Low (Two Stage)
Features a second stage coil or bypass to allow operation at low fire and high fire rates.
Key Specifications
| Closing Time | < 1 second for Class A safety valves. |
| Max Operating Pressure | Typically 200mbar, 360mbar, or 500mbar for gas trains. |
| Connection | Threaded (Rp 1/2" to 2") or Flanged (DN40 to DN125+). |
| Coil Voltage | 230VAC, 120VAC, or 24VDC. |
Leading Manufacturers
- DungsDMV, MVD series
- KromschroderVAS, VCS series
- HoneywellV4 series, V8 series
- SiemensVGG, VGD (Valve bodies)
- BrahmaEG, E6G series
- AscoGeneral purpose & safety
Related Components
Did you know?
Valve Proving Systems (VPS) are often required for burners over 1200kW. They use the pressure switch to verify that both safety valves are sealing tightly before every startup.