A valve for adjusting the air flow rate in an
internal combustion engine; the valve presents: a valve body; a cylindrical tubular
pipe obtained within the valve body and in which an air introduction channel is defined; a
valve seat obtained along the air introduction channel of the tubular
pipe; an actuation
system; a
shutter, mobile under the bias of the actuation
system; and a connection
flange, which is integral with a first end of the tubular
pipe and presents a plurality of through holes which are crossed in use by corresponding fastening screws for rigidly fixing the valve body; the connection
flange is provided with a lower plate and an upper plate, which are reciprocally parallel, facing and distanced and are arranged radially with respect to the cylindrical tubular pipe, and a number of ribs, which reciprocally connect the plates, are arranged perpendicularly to the plates, and are arranged axially with respect to the cylindrical tubular pipe.