For controlling the quantities of supply, waste and recycled air which can be transported by means of a blower (36) for the drying process in a drier (10), this latter comprises a cohesive valve space (38) in which two valve flaps (40 and 42) can be pivoted by a drive. According to the position which...http://www.google.es/patents/US4949477?utm_source=gb-gplus-sharePatente US4949477 - Control system with valve flaps for a drier
