| 摘要 |
What is described is a system for connecting a valve unit (2) to a fan structure (5) of an air-gas mixing device (1) for supplying burners of boilers and similar equipment, in which a gas feed section of the valve unit (2) can be connected sealingly to a tubular gas supply section of the mixing device (1) in an axial direction (X) of coupling between the aforesaid sections. The system comprises coupling means and counter-means, provided on the mixing device (1) and on the valve unit (2) respectively, which can be engaged with each other coaxially from and towards an operating position in which said sections are connected sealingly to each other, and axial retaining means between said coupling means and counter-means for retaining the valve unit (2) with respect to the mixing device (1) in the direction of axial interconnection. The coupling means and counter-means comprise at least one support appendage (7) formed in one piece with a manifold portion (6) of a fan (5) of the mixing device (1), and at least one end portion (11) of the feed section of the valve unit (2) which can be housed in a seat (10) provided in the appendage (7), the axial retaining means comprising at least one retaining element (12), which can be engaged removably in at least one groove (13a,13b) provided transversely with respect to the axial direction (X) in the end portion (11) of the valve unit (2) when the end (11) is received in the seat (10), so as to lock the valve unit (2) and the mixing device (1) together axially. |
