Abstract: A valve for air chambers includes a fixed body and a mobile selector body, wherein the mobile selector body is disposed coaxially in the fixed body. The mobile selector body is configured to slide with respect to the fixed body. The mobile selector body has a first position of use, associated during use to at least a first outlet, and a second position of use, associated during use to at least a second outlet.

Abstract: A valve for air chambers includes a fixed body and a mobile selector body, wherein the mobile selector body is disposed coaxially in the fixed body. The mobile selector body is configured to slide with respect to the fixed body. The mobile selector body has a first position of use, associated during use to at least a first outlet, and a second position of use, associated during use to at least a second outlet.

Abstract: Welding and cutting device, for film-wrapped packaging, includes two rotary shafts, both of which are fitted with radially projecting plates which, at their free ends, carry plates for cutting and welding the film, in which device each end of an actuating shaft with its respective welding and cutting plates is supported by the arm of a rocking lever which can pivot about a fulcrum integral with the structure of the machine, and the end of the other arm of the rocking lever is connected to components for positioning and for regulating a contrasting force, which components can be set while the machine is operating.