Abstract: An extra flat type gas burner assembly is provided, comprising an annular venturi (17), a tubular member (11) fast with the burner body (1) extending vertically thereunder to cover the injector (5) and position the latter coaxially at the intake (15) of the gas-air mixture in the burner body, whereas the injector (5) is supported freely by a structural element (18).

Abstract: In a pilot flame gas burner, particularly for a domestic appliance, comprising principal orifices for main flames distributed peripherally and peripheral gas conduit means beneath the principal orifices to generate at least one pilot flame extending peripherally to heat the foot of the main flames, the invention provides the following improvement. Said peripheral gas conduit means are arranged to generate a pilot flame collar extending continuously over the periphery of the burner without projecting appreciably from the peripheral surface of the burner and so that in zones disposed beneath the principal orifices, and each associated with at least one principal orifice, the pilot flame is more active and is adapted to heat the corresponding feet of the main flames.

Abstract: Gas burner arranged to operate with several types of gas, comprising a burner body equipped with an air inflow regulator ring which is a cylinder of revolution with an air inlet in its cylindrical side wall. The two end surfaces are provided respectively with two coaxial apertures for the outflow of the gas mixture of different diameters. This ring and its mounting emplacement in the body are such that it can be positioned in one or the other of two possible positions, with the aperture of largest diameter or of smallest diameter facing the gas nozzle accordingly as the gas is respectively a liquified petroleum or a manufactured or natural gas.

Abstract: Flat type gas burner with a body having a central vertical passage and a cap which define between them an annular convergent-divergent duct supplying flame orifices in the annular foot of the cap. The burner comprises an enclosure into which opens a flame orifice conferring on the mixture a flow speed identical with that of the other orifices. The volume of the enclosure permits an expansion of the mixture substantially to static pressure. The outlet aperture of the enclosure confers on the mixture a speed of flow 7 to 12 times less than that of the other orifices.

Abstract: A flat burner is provided, for household appliances, having a burner body (2) with an axial gas delivery passage (4) housing a gas injector and with a cap (8) resting on the body (2) through an annular ring (9) having flame orifices (12), an annular transversal convergent-divergent system being defined by the annular surface (11) of the body (2) bordering the passage (4) and the opposite surface (10) of the cap, in which: the diameter (D.sub.E) of the passage (4) is D.sub.E =D.sub.c .multidot.K.sub.3 with K.sub.3 =1.10 to 1.43 and D.sub.c =the diameter equivalent to that of the venturi of the convergent-divergent D.sub.c =D.sub.i .multidot.K.sub.4 with K.sub.4 =12.5 to 22 and D.sub.i =diameter of the injector for butane gas; the angle (.alpha.) of the convergent-divergent system is between 3.degree. and 8.degree.); the length of the divergent system is ##EQU1## with D.sub.1 the outer diameter of the ring; and mechanical means are provided for setting the diameter D.sub.c as a function of the gas used.