BUTTERFLY VALVE

The present invention is a butterfly valve (1) that has been modified such that it reduces internal losses in the closed position. The modifications according to the invention reduce losses occurring mainly through the shaft of the flap of the butterfly valve (1). The invention is of special interest in the use of butterfly valves in internal combustion engines for managing exhaust gases for their introduction into the intake by means of an EGR (Exhaust Gas Recirculation) system.