Honeywell Gas valve VK4105A1001B

The Honeywell VK4105A1001B is a gas valve used in burner ignition control systems, providing gas flow regulation for pilot and main burners. It includes a VK4105A1001U gas valve and an ignition regulator, and is compatible with natural and liquefied gases. The valve features a 1:1 gas-air mixture regulation, a built-in fine-mesh inlet filter, and operates at a nominal inlet pressure of 25 mbar with an ambient temperature of 20°C. It has an aperture size of 2.8 mm and is installed upright.

Parts of this type are selected by matching the gas type, inlet and outlet connections, electrical connections, and control system compatibility. The valve must be installed upright, and the inlet and outlet diameters (18.6 mm) and flange type must match the burner. Ensure the electrical connector and voltage (e.g., 24V) are compatible with the ignition regulator, excluding S4565/S4585 series. The mounting holes at the bottom must align with the installation points.

Common failures include the main valve not opening or closing properly due to servo or pressure relief issues, leading to no gas flow or unstable output pressure. Electrical faults in the position monitoring device can cause the system to shut down. Check the inlet filter for clogging, and verify the electrical connections and pressure readings.