Honeywell Gas valve VK4105M5157U

Honeywell VK4105M5157U gas valve is designed for burner control and ignition. It features a standard housing with flanged connections (18.6 mm inlet/outlet), a 2.8 mm diaphragm, a built-in fine-mesh filter, and a 4 mm pilot gas connection. The valve operates on natural and liquefied gas with a nominal inlet pressure of 25 mbar and an ambient pressure of 1013 mbar; output pressure is measured through a 0.5-inch sensor pipe. It employs a positive feedback system, a pressure servo controller, and a pressure relief valve, ensuring automatic main valve closure if power is lost or gas pressure is excessive. Regulation is gradual via a throttle valve, incorporating an electric two-level control mechanism and a 1:1 gas-air mixture ratio. It supports standard DBI ignition systems (excluding S4565/S4585 regulators) and operates at 24 V.

Valves of this type are selected by checking the flange connection size and the pilot gas connection diameter, as well as the closing force variant (e.g., B+C, B+B, B+J). If the valve has a side outlet for main and pilot burners, a flange collector must be used on the burner. Installation requires an upright orientation and the use of the bottom mounting holes. Electrical connections can be made via a connector or a plug-in rectifier unit; operating voltage is typically 24 V.