Honeywell Gas valve VK4105M5181B

The Honeywell VK4105M5181B is a gas valve used in burner control and ignition systems, providing safe ignition, flame control, and gas flow regulation for pilot and/or main burners. It is compatible with natural gas, liquefied gas, and heating gas, and features regulation of gas and air with a 1:1 ratio. The valve has an inlet and outlet diameter of 18.6 mm and can be connected via flanges. It is also installed on Baxi Main Four boilers (18 F, 24, 240 F, Quasar D 24, 24 F) with OEM equivalent 710669200.

Parts of this type are selected by matching the valve's connection size, gas type compatibility, and control features to the burner system. Installation typically involves mounting the valve vertically, connecting flanges or pipes, and ensuring proper electrical connections for the ignition regulator. Before ordering, verify the valve's inlet/outlet dimensions and the required voltage (e.g., 24V options) against the existing system.

Common failure modes for gas valves of this kind include failure to open or close, leading to no gas flow or gas leakage, which may cause burner ignition issues or unsafe operation. Symptoms may include the burner not lighting, flame instability, or the system shutting down unexpectedly. Check for proper power supply, gas pressure, and valve operation using pressure sensors and visual inspection.