Abstract: A pipe switch of the type having a stationary cylindrical housing enclosing a rotary cylindrical plug. The housing has a feeding connection for receiving pulverized or granular material and juxtaposed two discharging connections. The plug is formed with two diametral channels extending side-by-side so that in respective switching positions of the plug one of the channels connects the feeding connection to one of the discharging connections. The outlets and the inlets of the channels are surrounded by continuous sealing straps in such a manner that the distance in circumferential direction from the sealing strap and the adjoining side of the inlet or outlet openings is larger than the breadth of the inlet or outlet openings so that the sealing straps do not cross the edges of the mouth of the feeding and discharging connection pieces in the housing.

Abstract: The method of forming accurate charges of rubber composed of different sorts of rubber includes the steps of preparing for each sort a series of bales stored in a ready to feed condition on separate storing conveyors, successively discharging the required number of whole bales from respective series onto a common intermediate feeding conveyor wherefrom the batches of whole bales are supplied via a switching intermediate feeding conveyor to a scaling conveyor of an automatic scale. Part of whole bales is selectively directed to a cutting machine where the bales are successively disintegrated into smaller pieces and distributed according to the rubber sorts on separate storing and dosing conveyors directed to a hopper above the scaling conveyor.