Device for regulating the flow of combustion air in a boiler (1) mounted on the wall with a sealed chamber in which an ordinary burner is present, said chamber reaching the air through a corresponding duct (2) that flows (in 6) therein, an exhaust gas discharge duct (3) also being connected to this chamber, said ducts (2, 3) being separated or coaxial, said device comprising at least one element for throttling of the air passage cross section (6) of said feed duct (2) to allow the air flow in the sealed chamber to vary, said throttle element being a mobile element (10) capable of operating from outside the conduit (2), and being able to be locked in the position in which the cross section of the passage (6) of the latter is throttling again operating from the outside of said conduit (2), they will find said element (10) being arranged in correspondence with the end (5) of said conduit which is connected to the sealed chamber of the boiler (1), characterized in that the throttle element consists of an element (10) formed substantially as by less a part of a spherical cover and open on its surface (at 11), said element being disposed movably on the end (5) of the air supply duct (2), whose end is also formed as at least a part of a spherical cover and is provided with a surface opening (6) disposed substantially in a plane inclined to the longitudinal axis (K) of the conduit, and because the body (10) of the throttle element is provided with a grip ( 13) which projects perpendicularly to the conduit (2) and allows the element (10) to rotate relative to said conduit, said rotation being able to be blocked by fixing means. - - - (The German and French versions, respectively, follow the same claims that have been translated from the English version). - - -
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