Honeywell Gas valve VK4115A1000U

This gas solenoid valve for burners incorporates two shut-off valves controlled by two electrical devices, enabling two-level electric regulation. It features Softlite soft ignition, regulation of the gas/air ratio at 1:1, and pressure regulation by servo with an alternative throttle-valve method. The valve is suitable for natural and liquefied gas, with a nominal inlet pressure of 25 mbar and maximum operating pressure of 100 mbar. Its flanged connections have a nominal diameter of 18.6 mm and a 1/2" BSP.PL thread. The unit is built for a supply voltage of 220–240 V AC at 50 Hz, consumes 10.56 W, and provides a flow capacity of 4.4 m³/h at a pressure drop of 5 mbar.

Valves of this type are selected by the nominal diameter (18.6 mm), connection thread (1/2" BSP.PL), and maximum operating pressure (100 mbar). Different closing-force variants (B+J, B+C, B+B) are available, and the electrical connection can be chosen as a connector or a plug-in rectifier unit for a DBI ignition system, including 24 V versions. Installation requires an upright position; the mounting holes are at the bottom, and a side gas outlet is usable only with a flanged burner manifold. Before ordering, verify the flanged connection size and the required closing-force level.

Common failure modes include the valve failing to open or close, which shows as the burner not igniting or not shutting off when the control signal is removed. A stuck or leaking valve can cause gas to continue flowing, leading to flame instability or a burner that will not extinguish. Check the electrical supply to the operators, the diaphragm for wear or damage, and the inlet pressure against the rated maximum of 100 mbar.