Mechanism for changing over fluid passages

摘要

A fluid-passages change-over mechanism for transmitting powdery or granular material comprises a circular casing, a circular rotating plate having a drivable center axle rotatably admitted within the casing and a casing cover, and a swing pipe mounted on the circular rotating plate which extends through an arc-shaped opening in the cover. The mechanism further comprises an A circuit pipe and a B circuit pipe both fixed on an arc of the same radius from the axis of the circular casing. In operation, the A circuit pipe or the B circuit pipe communicates with the swing pipe through a reciprocating constant angle rotation of the circular rotating plate to change-over the powdery or granular material.