Magnet-thermocouple for the fail-safe safety supply of gas to burners or the like, in particular of fail-safe safety control for domestic cooking devices, comprises: at least one gas burner, which gas burner is connected to a gas supply source by flame-regulating means and by means of a safety valve driven by a flame presence sensor consisting of a thermocouple, said safety valve having an open condition, wherein said supply source supplied said burner, and a closed condition, wherein the gas passage is interrupted and wherein the thermocouple, in the presence of a flame, generates an electrical signal constituting the drive signal for the passage of said safety valve from an open condition to a closed condition, and vice-versa, of said safety valve, whereas a further drive signal generator and power supply of said safety valve is provided, for the temporary and alternative supply of the safety valve during the flame ignition step heating the thermocouple, to the temperature generating the drive signal. According to the invention, the signal generator and power supply comprise power limiters to limit the signal generated and an automatic deactivating unit whenever the power supply is overloaded for a predefined amount of time, the power necessary for the drive signal of the safety valve being greater than the one determined by the limiters.

The present invention relates to a gas burner system (10) for a gas cooking hob, in particular for a domestic gas cooking hob. Said gas burner system (10) comprises a gas burner assembly (12) including a plurality of flame ports. At least one pot support (14) is arranged above and/or around the gas burner assembly (12) and defining a distance between said gas burner assembly (12) and a bottom of a cooking pot. At least one supply air fan (16) is provided for generating an air flow (24) to the gas burner assembly (12). A gas inlet (38) is connectable or connected to a gas supply. A gas regulator (18; 30; 36; 38) is provided for regulating a gas flow from the gas inlet (38) to the gas burner assembly (12). A control unit (20) is provided for controlling the supply air fan (16) and the gas regulator (18; 30; 36; 38). At least one thermocouple (22) is provided for detecting flames above the gas burner assembly (12) and for providing a flame signal (28) to the control unit (20).

A gas heater (10) includes heater burner (16). Heat is generated by the ignition of gas supplied to the burner via conduits (20). A solenoid gas safety valve (22), when provided with a threshold electrical current, is maintained in an open condition allowing passage of gas to the burners. When not provided with that threshold current, the valve is closed, preventing the passage of gas. An electrical current generator (28) includes spaced apart thermocouple devices (30, 32). Due to a combined electrical current generation by the thermocouples, the current generator can generate electrical current at least said threshold current even if any one of the thermocouple devices does not generate the threshold electrical current.

A cooking device is provided. The cooking device includes a burner body having a nozzle to supply a gas, a burner head provided above the burner body, and having a mixed gas chamber in which air and the gas injected from the nozzle are introduced. a burner cap provided on the burner head, a flame remaining chamber provided at the burner head and separated from the mixed gas chamber, and a flame detection unit to pass through the burner head and located at the flame remaining chamber.

Disclosed is a dual-fuel heater having one or more thermocouples that operate a control valve that, in turn, controls whether fuel is distributed from a regulator to a burner based on the signal generated by the thermocouple(s). Further disclosed is a primary fuel selector valve that selects the fuel being used based on the operation of a user. The primary fuel selector valve provides fuel to the control valve upstream from the thermocouples, allowing for upstream control mechanisms such as a slave valve, to control the flow of fuel to the control valve.

A heating system can include a supply piping assembly configured to supply either a first fuel or a second fuel to at least one main burner, a first pilot burner and a second pilot burner. First and second electromagnetic valves can be operatively connected to an electrical power supply and at least one of the thermocouples. The first and second electromagnetic valves can be configured to permit and prevent the fuel from reaching at least one of the first pilot burner, the second pilot burner and the at least one main burner depending upon thermoelectric potential received from the at least one of the thermocouples.

A gas burner arrangement for a hotplate includes at least two gas burners, each gas burner having operably connected thereto a gas valve for regulating a combustion gas flow to the gas burners, and a thermoelement for monitoring a flame of the gas burners. The thermoelement is coupled to the gas valve by an electrical circuit, such that when the flame of the associated gas burner is extinguished, the combustion gas flow to the gas burner is interrupted with the aid of the gas valve. Each electrical circuit includes a mechanically actuatable switch configured to couple or decouple the electrical circuit between the associated thermoelement and the associated gas valve. The mechanically actuatable switch includes a contact element having a noble metal. A shared actuation element controls the mechanically actuatable switches of the electric circuits.

A heating apparatus may include a control valve assembly. A control valve assembly can have a housing and a valve body positioned within the housing. The housing can define an inlet and first and second outlets. The control valve assembly can also include an igniter having a sensor for firing an electrode. An extension can be used to activate the sensor and to thereby activate the igniter.

An assembly for controlling the flow of a gas to a gas burner. The assembly including a rotational regulating valve and an electromagnetic safety valve. The regulating valve is rotational between a first angular position corresponding to a closed position and a second angular position corresponding to an open position. The safety valve includes a valve member that translates axially between a first axial position corresponding to a closed position and a second axial position corresponding to an open position. An operating shaft is operably coupled to the rotational regulating valve and to the electromagnetic safety valve and is rotatable between angular positions corresponding to the closed and open positions of the rotational regulating valve and is axially translatable between axial positions corresponding to the closed and open positions of the valve member of electromagnetic safety valve, axial translation of the operating shaft is not permitted when the angular position of the operating shaft corresponds to an open position of the rotational regulating valve.

A low cost, pneumatic, thermo-electric apparatus and method capable of controlling both a pilot gas burner and a main heating gas burner for ensuring cessation of fugitive methane emissions from process heating systems upon loss of the pilot flame, without requiring external electricity, are described.