A gas valve for a gas stove, comprising a valve housing, wherein the valve housing has a gas inlet and a gas outlet, and a gas regulating unit, wherein the gas regulating unit has a cylindrical outer surface, wherein the gas regulating unit is rotatable supported in the valve housing by means of the outer surface, wherein the gas regulating unit has a plurality of gas outlet openings, wherein the gas regulating unit is rotatable into a plurality of flame positions, wherein each gas outlet opening is assigned to one determined flame position, wherein in each flame position the gas inlet is connected to the gas outlet by means of the gas outlet opening which is assigned to the one determined flame position, and wherein the gas outlet openings have cross-sectional areas which differ from each other in order to achieve different flow rates of gas through the gas valve in the individual flame positions.

A flue gas analyser for determining the efficiency of a burner burning a supply gas and producing a flue gas by: calculating an efficiency of the burner based on a detected amount of a first target gas in the flue gas and an expected amount of the first target gas in the flue gas; predicting an amount of a second target gas in the flue gas based on the efficiency of the burner; estimating a composition of the supply gas based on a detected amount of the second target gas in the flue gas and the predicted amount of the second target gas in the flue gas; and correcting the calculated efficiency of the burner based on the estimated composition of the supply gas.

A cooking appliance and method generate an audible and/or visual indication to a user when a user control for a gas burner is in a position within which an igniter is active and a gas valve is supplying sufficient gas flow to the gas burner to support ignition and thereby assist a user in properly positioning the user control during ignition of the burner.

A gas supply tap having a control knob (2) connected to an operating stem adapted to operate a valve or a shutter for opening and closing the tap is disclosed. The gas supply tap includes a detecting device to detect the position of the knob, at least one component of the detecting device being translationally and rotationally integral with the operating stem.

A gas burner may include a burner body, a first gas orifice, a second gas orifice, a mixed outlet nozzle, an injet body, a gas supply line, a secondary gas line, and a flow sensor. The first gas orifice may be directed towards a plurality of naturally aspirated flame ports. The second gas orifice may be spaced apart from the first gas orifice. The mixed outlet nozzle may be downstream from the second gas orifice and directed towards a plurality of forced induction flame ports. The injet body may define an air passage and a mixing chamber downstream from the air passage. The gas supply line may be mounted on the injet body. The secondary gas line may extend in fluid parallel to the first gas orifice. The flow sensor may be positioned in fluid communication with the secondary gas line to detect a flow rate of gaseous fuel therethrough.

Systems and methods for operating a gas-fired appliance such as a gas-fired cooking grill are provided. An embodiment of the system includes a gas burner for heating a chamber of the gas-fired appliance. The system includes a first valve associated with the gas burner to control a gas flow to the gas burner. The system includes a second valve configured to controllably supply gas to the gas burner via the first valve. The second valve is automatically adjustable based on a desired temperature of the chamber and an actual temperature of the chamber.

Systems and methods operate to infer a fuel composition in a combustion system. The fuel composition may be inferred by receiving measured operating parameters including one or more of fuel data defining fuel characteristics used in combustion within a heater of the combustion system, emissions data defining emission gasses exiting the heater, airflow data defining ambient air being supplied to the heater and airflow rate of the air within the heater. One or more relationships within the measured operating parameters may be identified that result in a list of potential fuel compositions. One of the potential fuel compositions from the list may be selected having sufficient likelihood of resulting in the measured operating parameters as an inferred fuel composition. The output the inferred fuel composition to a heater controller of the combustion system and used for automatic control thereof.

A method for controlling a fuel-oxidizer mixture in a premix gas burner includes: receiving a flame signal representing the presence of a flame deriving from the combustion of a fuel of a first predetermined type or a second predetermined type inside a combustion cell; accessing fuel data representing the fact that the gas fuel belongs to the first type or the second type; generating drive signals to control a gas flow regulating valve that supplies gas to the burner and to control a rotation speed of a fan configured to take in oxidative air; sending the drive signals to the gas flow regulating valve and to a motor connected to the fan. A memory unit contains first regulation data and second regulation data and is programmed to generate the drive signals based on the first regulation data or on the second regulation data, depending on the fuel data.

A device for controlling a fuel-oxidizer mixture for a premix gas burner includes: an intake duct, including an inlet, a mixing zone, and a delivery outlet; an injection duct; a gas regulating valve, located along the injection duct; a fan, located in the intake duct to generate therein a flow of the oxidizer fluid or of the mixture; a control unit, configured for generating drive signals; a sensor unit, configured to detect a first differential pressure, between a first detecting section, located in the intake duct upstream of the mixing zone in the direction of inflow and a second detecting section, located in the intake duct downstream of the mixing zone in the direction of inflow, and configured to detect a second differential pressure, between the first detecting section and a third detecting section, located in the injection duct between the gas regulating valve and the mixing zone.

A cooking appliance including an oven compartment, and first and second gas burners positioned to supply heat to the oven compartment. The first and second gas burners respectively include first and second electromechanical modulating valves that respectively couple the first and second gas burners to a gas supply. A controller is used to control the first and second gas burners to heat the oven compartment, and the controller, when maintaining a predetermined temperature in the oven compartment, controls the electromechanical modulating valves of the first and second gas burners to vary respective output levels of the first and second gas burners while maintaining a substantially constant combined output level for the first and second gas burners.