Abstract: This invention relates to a control and safety circuit (1) for gas delivery valves, comprising an actuator (50) opening the gas delivery valve; a control unit (100) intended to emit a command signal (V2) to activate the actuator and switch on the valve, and a clock signal (CK); and a memory (5) placed between the control unit (100) and the actuator (50). The memory is capable of receiving the command signal (V2) and the clock signal (CK) as inputs, and at the same time emits an output signal (V3) which is a function of the input command signal (V2) and a clock signal (CK). The output signal (V3) is sent to the actuator (50) to command the same to open the valve.

Abstract: A method is provided for controlling the feed of a combustible gas by a valve device placed in a feed pipe which has a gas inlet section and a gas outlet section. The device includes a valve seat in the pipe associated with a membrane-operated plug and a device for returning the plug to a position in which the valve seat is shut off. The method includes the steps of creating a pressure difference in a section of the pipe downstream of the plug with respect to the direction of flow, by a constriction in the pipe having a predetermined cross section, the pressure difference being defined by a first pressure upstream of the constriction and a second pressure downstream of the constriction; collecting the signal formed by the second pressure downstream of the constriction and making the second pressure act on the side of the membrane opposite that on which the first pressure acts; and generating a regulatable load on the membrane of the membrane operating system.

Abstract: A device for controlling a combustible gas supply to a burner is provided, which includes first and second servovalves, having respective valve seats associated with a corresponding shut-off mechanism, which include respective first and second control solenoid valves with an electromagnetic operating device that controls the opening/closing of the corresponding servovalve. The solenoid valves act to indirectly control the corresponding servovalve's respective shut-off mechanism. The pipes of the control are in communication with the main pipe through an auxiliary bleed pipe. A pilot pipe is branched from the auxiliary pipe to supply a pilot burner, and a thermoelectric magnetic unit with a knob is provided on the auxiliary pipe, which allows gas to flow towards the pilot burner when the unit is activated, while simultaneously shutting off the flow of gas towards the servovalve control circuit. The device includes a control mechanism, controlled by the knob, which controls gas flow.

Abstract: A flame atmosphere analyzer is described, for operation with combustible gases, including a tube in which an intake and air and gas mixing chamber is formed, a first gas supply nozzle and means for supplying primary combustion air opening into said intake chamber, and a flame burner in fluid communication with the intake and mixing chamber for supplying an air and gas mixture, formed in the chamber, to the burner. The analyzer includes a second gas supply nozzle, which is slidably guided in the tube, and an actuator provided on the tube and operable from outside the tube, for moving the second nozzle between an inoperative first position, in which the gas is supplied through the first nozzle, and an operational second position, in which the gas is supplied through the second nozzle, the first nozzle having no effect on the supply of the gas in the second position.

Abstract: A fireplace is provided, in which a flame can be lit. The fireplace including a warning system, which includes a proximity sensor to detect the presence of object within an active volume, the volume surrounds at least a portion of the fireplace. The system also includes an alarm device to emit an alarm signal, a clock to calculate a time elapsed since the switching off of the fireplace, and a processing unit receiving as input data from the clock and the proximity sensor, and outputting command signals to the alarm device. The alarm device is activated by the processing unit to generate an alarm signal when an object is detected by the proximity sensor as entering the active volume and the fireplace has been switched off since no later than a first pre-defined time interval. Also provided is a method for warning when an object enters the active volume of a fireplace.

Abstract: A device for controlling a gas supply to a burner includes a main duct, which is provided with at least one main valve including a valve seat and associated shutter with a control for opening the seat in opposition to a resilient recall member. A pilot duct leads from the main duct to supply a pilot burner, the main duct includes a magnetic thermoelectric safety unit which is manually or automatically armed, acting on the pilot duct to enable gas to flow to the pilot burner when armed. The pilot duct includes a pressure regulator having a shutter with a membrane control, the membrane subject to pressure regulated by the regulator and to a calibration pressure determined in a calibration chamber of the regulator. The device includes a fluid connector between the calibration chamber and the main valve to provide a pressure signal correlated with the gas supply pressure.

Abstract: A valve unit for controlling the delivery of a combustible gas, in particular for delivery via a gas metering apparatus including a main gas through-flow pipe (2), the unit comprising a servovalve with a first valve seat (3) provided on the pipe and associated with a respective first shutter (6) with diaphragm control (7) for the opening of the seat (3) in opposition to a first return spring (22), an operating chamber (10) for controlling the servovalve, the chamber being in communication with an inlet section (4) of the main pipe (2), upstream of the first valve seat (3), one side (7a) of the diaphragm (7) being subjected to the pressure prevailing in the chamber (10), the other side (7b) being subjected to the pressure prevailing downstream of the first valve seat, in the region of an outlet section (5) of the pipe (2), the operating chamber (10) being in communication with the outlet section (5) via a second valve seat (9) co-operating with a second shutter (8).

Abstract: A device is provided for controlling a gas supply to a burner, having a draft shut-off device and includes a main gas supply pipe with first and second servovalves therein, which include respective valve seats associated with corresponding shut-off members with diaphragm control for opening the seats in opposition to a resilient return member. A pilot pipe branched from the main pipe supplies a pilot burner. A thermoelectric magnetic safety unit is provided on the main pipe, acting to allow gas to flow towards the pilot burner when the unit is activated. The draft shut-off device includes a corresponding shut-off member movable from and towards a position in which an exhaust pipe is shut off, and a diaphragm-controlled pneumatic actuator of the shut-off member, the diaphragm forming a corresponding control chamber of the shut-off member which is in fluid communication with an auxiliary pipe section branched from the main pipe.

Abstract: A device for controlling the delivery of a combustible gas to a burner apparatus is provided including a main gas-delivery duct in which there is at least one servo-assisted diaphragm valve including a valve seat associated with a corresponding closure member with diaphragm control for opening the seat against the action of a resilient biasing member. The diaphragm valve includes a respective control solenoid valve with an electromagnetic operator for controlling the corresponding valve, the solenoid valve being arranged to bring about the opening/closure of a duct of a respective servo-assisted control circuit so as to operate the closure member of the valve indirectly, by the diaphragm control. The duct of the control circuit putting a portion of the main duct that is disposed upstream of the valve seat with respect to the direction of the gas-flow into flow communication with a respective control chamber of the diaphragm valve.

Abstract: An automatic system and method to provide the ignition and monitoring of a pilot flame for gas burners. The circuit includes a microcontroller that acts on at least one gas valve, a flame igniter, and a flame detector circuits. The valve driver is a switching circuit able to open the valve and keep it open with power saving. The flame detection uses the ionization principle with full use of the rectification property of a flame. Furthermore the flame detection is activated for reduced times to save power. The microcontroller governs the system according to the signals that it receives from points of the circuit. The system provides a circuit realizing advanced power saving techniques to provide also a long term operation on battery powered systems. In addition the automatic control can save gas resources versus traditional thermocouple based systems by applying the intermittent pilot ignition.

Abstract: A device for controlling a combustible gas supply to a burner is provided, which includes first and second servovalves, having respective valve seats associated with a corresponding shut-off mechanism, which include respective first and second control solenoid valves with an electromagnetic operating device that controls the opening/closing of the corresponding servovalve. The solenoid valves act to indirectly control the corresponding servovalve's respective shut-off mechanism. The pipes of the control are in communication with the main pipe through an auxiliary bleed pipe. A pilot pipe is branched from the auxiliary pipe to supply a pilot burner, and a thermoelectric magnetic unit with a knob is provided on the auxiliary pipe, which allows gas to flow towards the pilot burner when the unit is activated, while simultaneously shutting off the flow of gas towards the servovalve control circuit. The device includes a control mechanism, controlled by the knob, which controls gas flow.

Abstract: A gas burner apparatus with pre-mixing includes a mixing device for mixing an air/gas mixture which is intended to be conveyed to the intake section of a fan unit whose delivery is conveyed to a combustion head of the burner. The mixing device including a plurality of ducts, each of which has a region in the form of a Venturi duct with contiguous portions which are convergent/divergent, with respect to the direction of flow, and with a restricted duct cross-section defined between the convergent portion and the divergent portion, there being conveyed in each convergent portion an air flow which is intended to be mixed with a gas flow which is introduced into the duct at the restricted cross-section, the air/gas mixture being conveyed through the divergent portion of the duct to the intake section of the fan unit.

Abstract: A system for the leaktight connection of a valve unit to a respective pipe, is provided. The valve unit includes a gas through-flow section, a threaded male attachment element being formed integrally with the valve unit and having an axial through cavity defining the gas through-flow section, for leaktight clamping by a pipe-fixing ring-nut connector which can be screwed onto the male threaded portion of the attachment element. The system includes a second leaktight connector which can be put into operation as an alternative to the ring-nut connector. The second connector including at least one axial retaining element which can be releasably restrained on the valve unit in the region of the threaded portion of the male attachment element, in a manner such that the pipe is restrained axially relative to the valve unit.

Abstract: A method is provided for controlling the feed of a combustible gas by a valve device placed in a feed pipe which has a gas inlet section and a gas outlet section. The device includes a valve seat in the pipe associated with a membrane-operated plug and a device for returning the plug to a position in which the valve seat is shut off. The method includes the steps of creating a pressure difference in a section of the pipe downstream of the plug with respect to the direction of flow, by a constriction in the pipe having a predetermined cross section, the pressure difference being defined by a first pressure upstream of the constriction and a second pressure downstream of the constriction; collecting the signal formed by the second pressure downstream of the constriction and making the second pressure act on the side of the membrane opposite that on which the first pressure acts; and generating a regulatable load on the membrane of the membrane operating system.

Abstract: What is described is a burner, specifically for gas fuels with premixing, comprising a burner body designed to be housed in a combustion chamber of a heating apparatus, the burner body being provided with a burner head on which an air and gas mixture supplied to the combustion chamber is burnt, in which the burner head has a surface profile in the form of a dome-shaped spherical segment, the height of the dome being less than half of the diameter of the sphere to which the segment belongs.

Abstract: A burner is provided and includes a cylindrical burner head housed in a combustion chamber of a heating apparatus, on which an air and gas mixture is burnt, the head including a cylindrical shell with through apertures, fixed at a first axial end by a connecting flange to a shutter element intended to seal the combustion chamber, while its opposite axial end has a solid end wall which seals the head, an element for distributing the air and gas mixture, positioned inside the burner head and intended to distribute the flow of combustible mixture reaching the burner on to the burner head. The distributor element includes a plate-like portion extending as a continuation of the connecting flange and extending substantially in an orthogonal direction to the axial direction of extension of the cylindrical head, the plate-like portion having through apertures for distributing the mixture to the burner head.

Abstract: A device for regulating the delivery pressure of gases includes a valve unit having at least one valve seat and a respective closure element displaceable along an axis with respect to the valve seat which is controlled by a diaphragm. The device further includes a first spring which acts on the diaphragm in order to subject it to a preselected resilient load. A second spring is selectively activated to exert an additional resilient load on the diaphragm. The device includes a handle associated with the first and second springs in order to impose selectively the desired delivery pressure value, between a minimum value and a maximum value of pre-calibration, the pressure value being proportionally correlated with a predetermined resilient load exerted on the diaphragm.

Abstract: A device for controlling the delivery of a combustible gas to a burner apparatus is provided including a main gas-delivery duct in which there is at least one servo-assisted diaphragm valve including a valve seat associated with a corresponding closure member with diaphragm control for opening the seat against the action of a resilient biasing member. The diaphragm valve includes a respective control solenoid valve with an electromagnetic operator for controlling the corresponding valve, the solenoid valve being arranged to bring about the opening/closure of a duct of a respective servo-assisted control circuit so as to operate the closure member of the valve indirectly, by the diaphragm control. The duct of the control circuit putting a portion of the main duct that is disposed upstream of the valve seat with respect to the direction of the gas-flow into flow communication with a respective control chamber of the diaphragm valve.

Abstract: A device for regulating the air/gas mixture supplied to a gas burner appliance of a decorative fire is provided. The device includes a duct for supplying the air/gas fuel mixture to the burner and a choke of the flow of primary air taken into the duct and adapted to be mixed with the flow of gas or the flow of the air/gas mixture, in which heat-sensitive actuator acting directly on the choke is provided so that the choking of the flow is regulated automatically as a function of the heat level reached in the heat-sensitive actuator.