An automatic ring valve comprising a valve seat provided with a plurality of gas flow passages arranged according to at least one annular row, at least a shutter comprising at least one ring-shaped portion for selectively closing and opening the gas flow passages, wherein the ring-shaped portion of the shutter comprises a fiber-reinforced matrix, at least one contrasting member for contrasting an opening movement of ring-shaped portion of the shutter, wherein the ring-shaped portion of the shutter comprises continuous fibers, at least some of the fibers developing for at least 360° of the annular development of the ring-shaped portion.
