Honeywell Gas valve VK4105C1066U

The Honeywell VK4105C1066U is a gas valve designed for burner control and ignition systems, providing safe ignition, flame control, and gas flow regulation for pilot and/or main burners. It operates at 24V and features a standard housing with a side gas outlet. The valve has a maximum inlet pressure of 60 mbar, a nominal inlet pressure of 25 mbar, and a maximum operating pressure of 45 mbar. It includes a positive feedback system for stable output pressure and a softlite pressure of 7 mbar. The valve has a flow capacity of 3.4 m³/h with a pressure drop of 3 mbar, and its connection thread is 1/2" BSP.PL. It is suitable for use with heating gas, natural gas, and liquefied gas.

Parts of this type are selected by matching the connection thread, operating voltage, and gas type. The valve must be installed with the correct orientation, typically vertical, and the inlet and outlet diameters (18.6 mm) must align with the piping. Ensure the ambient temperature range (-15 to 60 °C) is suitable for the installation environment. The electrical connection can be via a connector or plug-in rectifier unit, and the pilot gas connection diameter is 4 mm. Before ordering, verify the maximum inlet pressure and back pressure ratings against the system requirements.

Common failures include the valve failing to open or close properly, leading to no gas flow or gas leakage. Symptoms may include burner ignition failure, unstable flame, or pressure fluctuations. Check for blockages in the inlet filter (not intended for cleaning) and ensure the electrical connections are secure. If the valve does not respond to control signals, test the coil and wiring for continuity.