Honeywell Gas valve VK4100Q2003B

The Honeywell VK4100Q2003B is a gas valve designed for burner control and ignition systems, regulating gas flow for both pilot and main burner. It features a 1:1 gas-air ratio regulation, a compression fitting of 4 mm, and operates within an ambient temperature range of -15 to 60 °C. The valve has a maximum inlet pressure of 60 mbar and a maximum operating pressure of 30 mbar, with a flow capacity of 3.4 m³/h at a pressure drop of 3 mbar. It includes two electronic devices for valve control and position monitoring, and supports flanged connections with an inlet/outlet diameter of 18.6 mm. The valve has a back pressure of 50 mbar on the first valve, meets leakage standard EN126, and includes a pilot flow feature.

When selecting a gas valve of this type, ensure the connection thread and diameter match the existing piping, and verify the maximum inlet and operating pressures are compatible with the system. The valve must be installed upright, and the electrical connections should match the ignition regulator, with exceptions for certain series. Check the ambient temperature range and pressure drop requirements to confirm suitability for the application.

Common failures in gas valves of this kind include sticking or leaking valves, which can cause erratic flame behavior or failure to ignite. Symptoms may include the burner not starting, fluctuating gas pressure, or the system shutting down unexpectedly. Check for proper electrical connections, valve operation, and any blockages in the inlet filter.