Abstract: The present invention relates to a rotary valve for conveying and metering bulk material into a pneumatic conveying conduit. Exemplary embodiments include a housing with a supply opening, a discharge opening and a cellular wheel supported rotatably about a substantially horizontal axis within a cavity of the housing. The cellular wheel rotates in a predetermined direction of rotation so that as some of its cells move upward, other cells move downward. The housing has at least one venting opening for venting the upward moving cells, the venting opening being arranged before the supply opening when seen in the direction of rotation. A perimeter of the at least one venting opening lies on a peripheral wall of the housing and has a plurality of recesses which extend in a direction towards the cellular wheel when the latter rotates in the direction of rotation.

Abstract: A rotary feeder for jam-free operation over a wide speed range has a housing with a feed inlet provided with a roof-shaped baffle plate which, in the running direction of the rotor, includes double-arrowed stripping edges. Each compartment of the rotor includes two radial partitions which extend beneath the baffle plate and are spaced from each other by the width of the baffle plate to define an initially bulk material free space. This space between the partitions of each compartment is connected via circumferential openings with the respectively lateral areas of the rotor compartment to allow granulate particles to enter the space after traveling along the stripping edges.