Honeywell Gas solenoid valve VK4105G1070U

The Honeywell VK4105G1070U is a gas solenoid valve designed for burner control and ignition systems, ensuring safe ignition and gas flow regulation for both pilot and main burners. It operates with a supply voltage of 230 V AC at 50 Hz, has a maximum inlet pressure of 60 mbar, and a flow capacity of 2.7 m³/h. The valve features a positive feedback system, pressure servo controller, and pressure relief valve, providing stable output pressure. It includes a built-in fine-mesh filter and is compatible with ignition electronics S456..M. The valve is suitable for heating, natural, and liquefied gases, and fits specific Ferroli boiler models.

Parts of this type are selected by matching the connection thread, supply voltage, and maximum operating pressure to the existing system. The valve must be installed upright, and the inlet and outlet connections (e.g., 1/2" external thread) must align with the burner manifold. Ensure the flow capacity and pressure ratings meet the burner requirements. The valve may have flanged connections, requiring a flanged burner manifold for side outlets. Check the electrical connection type (connector or plug-in rectifier) and compatibility with the ignition electronics.

Common failure modes include valve sticking open or closed, leading to gas flow issues or failure to ignite. Symptoms may include burner not starting, flame instability, or gas leakage. Check for proper electrical supply, coil continuity, and diaphragm integrity. Pressure fluctuations or inability to maintain output pressure may indicate servo controller or relief valve malfunction. Inspect the fine-mesh filter for clogging, which can restrict gas flow.