Honeywell Gas valve VK4100C1000B

The Honeywell VK4100C1000B is a combined gas valve designed for gas flow control in burner and boiler systems. It operates with natural and liquefied gas, featuring a positive feedback system and two main valves. The valve includes a built-in fine-mesh filter and supports smooth ignition via Softlite technology, with a Softlite time of 1.5 seconds. It has a maximum inlet pressure of 60 mbar, a maximum working pressure of 45 mbar, and a flow capacity of 3.4 m³/h at a pressure drop of 3 mbar. The valve is upright, has a side outlet, and connects via flanges with an inlet/outlet diameter of 18.6 mm.

When selecting a replacement gas valve of this type, ensure the connection thread type (flanged), inlet/outlet diameters, and maximum working pressure match the system requirements. The valve must be installed upright, and the electrical connection (connector or plug-in rectifier unit) must be compatible with the existing ignition system. Verify the gas type (natural or liquefied) and the supply voltage (24 V) before installation. Also, check the ambient temperature range and ensure the valve's flow capacity meets the burner's demand.

Common failures in combined gas valves include sticking or leaking valves due to debris or wear, leading to unstable gas flow or failure to close. Symptoms may include burner ignition failure, fluctuating flame, or gas odor. Check the fine-mesh filter for clogging (though not intended for cleaning) and inspect the pressure relief valve and servo controller for proper operation. If the valve fails to open or close, test the electrical connections and supply voltage.