Valve for opening and closing of an intake tube

The valve for opening and closing a pipe has at least one sealing system (70) which is fitted so as to be radially movable in such a way that it is sealing contact with the inner wall of the pipe, and forms a gap between the valve and inner wall in the open position and in the pivoting area from the closed position to the open position. The sealing system is controlled by a camshaft (74) to execute the radial movement. The camshaft has teeth (76) which mesh with a toothed ring (77) which fixed in relation to the rotatable valve.