Abstract: A rotary valve comprises a housing having a supply opening and a discharge opening and defining an inner substantially rotary symmetrical wall around an axis of rotation. A cellular wheel is supported rotatably about the axis of rotation within the housing, and includes a hub or shaft. A series of inner web plates is arranged to extend radially in a star-shape on the hub and have a radial outer wedge surface inclined with respect to the axis of rotation. An equal number of outer web plates have each a radial inner wedge surface which rides on and engages the radial outer wedge surface of a respective inner web plate. The web plates are guided by respective radial guidances. In the region of the radial outer edge of each of the outer web plates is a sealing strip radially displaceable and guided by a respective radial guidance to engage the housing's inner wall.