Electromagnetic feed valve for water heater gas burner - has valve plates for respective gas feed rates separately adjusted by coaxial screws at base of housing and externally accessible

摘要

The valve has an induction coil acting on a magnetic core, the movement of which controls a blocking element to allow progressive opening of the gas passage between an upper admission chamber and a lower discharge chamber. The blocking element comprises a plate acted on by a variable spring bias, with a rear extension tube defining a restricted flow passage between the two chambers which is blocked by a further plate having a complementary bias regulation system. Both of these are provided by coaxial independent adjustment screws fitted through the bottom of the valve housing and adjustable from the outside. The valve is used for a burner in a water heater with operation of the two valve plates controlled by two different temps., allowing for a wide range of difference int he water inlet temp.