Abstract: A reversing valve (100) for a high-viscosity medium comprises a housing (10) having an inlet opening (23) and at least two outlet openings (21, 22), extending into a valve bore in which is mounted an axially displaceable valve stem (10, 10?). The valve stem comprises a groove by which the inlet opening (23) is alternatively to be connected to one of the outlet openings (21, 22). The groove has an axially extending inflow zone (12) and an axially extending outflow zone (11, 11?). The inflow and outflow zones are connected at both ends to a continuous annular channel by way of connecting channels (13, 14).

Abstract: A filtering device (100) for plastic melts exhibits at least one screen plunger (10) arranged movably between an inlet channel (5) and an outlet channel (6) of a housing (1) and containing replaceable, three-dimensional filter elements (25). The inside of the filter elements (25) is connected to at least one melt channel (11, 12) formed in the screen plunger (10). The melt channel is connected to the inlet or outlet channel (5, 6) of the housing (1) when in the production position. The screen plunger (10) exhibits at least one receiving chamber (14) that can be closed using a cover (16) on the face side. Several filter elements (25) are bundled with a central distribution element (20) to a filter cartridge (30) that can be placed in the receiving chamber (14).