Honeywell Gas solenoid valve VK4105A1035U

The Honeywell VK4105A1035U is a gas solenoid valve designed for burner ignition control systems, managing gas flow for both pilot and main burners. It features a standard housing, a built-in fine-mesh filter (not intended for cleaning), and an optional output filter. The valve regulates gas and air mixture in a 1:1 ratio, includes a pressure relief valve, and provides stable output pressure. It has a pilot gas connection diameter of 4 mm and mounting holes at the bottom. The valve operates at an ambient pressure of 1013 mbar and requires a flange collector for side outlet use.

When selecting a replacement gas valve of this type, ensure the inlet and outlet connections match the existing flange dimensions and that the valve's mounting holes align with the installation. Verify the pilot gas connection diameter and the availability of an optional output filter if needed. The valve must be compatible with the ignition regulator, except for the S4565/S4585 series, and support standard DBI ignition systems. Check the required voltage and confirm that the valve's pressure relief and servo regulation features are suitable for the burner's control system.

Common failures in gas valves of this kind include clogging of the built-in filter, which can restrict gas flow and cause burner ignition issues. A faulty pressure relief valve may lead to unstable output pressure, resulting in flame fluctuations or burner shutdown. Electrical connection problems can prevent the main valve from opening, causing the burner to fail to ignite. Regular inspection of the filter and pressure settings is recommended to detect early signs of malfunction.