Abstract: A firearm of the rotating bolt type includes a housing part made of plastic or metal, a metal bolt carrier guide, a bolt carrier that is guided by the bolt carrier guide and that has a bolt head rotatably mounted in it, and, held by the housing part, a metal barrel nut in which a barrel can be fixed and in which the bolt head can be locked. The bolt carrier guide is directly connected with the barrel nut so that it is rigid with respect to movement, at least in the longitudinal direction of the firearm.

Abstract: A firearm of the rotating bolt type includes a housing part made of plastic or metal, a metal bolt carrier guide, a bolt carrier that is guided by the bolt carrier guide and that has a bolt head rotatably mounted in it, and, held by the housing part, a metal barrel nut in which a barrel can be fixed and in which the bolt head can be locked. The bolt carrier guide is directly connected with the barrel nut so that it is rigid with respect to movement, at least in the longitudinal direction of the firearm.

Abstract: The invention relates to a centrifugal pump, in particular a waste water submersible pump having an impeller (1), of which the end face facing the pump intake opening is open and only the end face of the impeller facing away from the intake opening (8) is covered by a circular coaxial impeller hub (2), on which the curved vanes (3, 4) are fastened, and in particular molded on, wherein the base plate (7) having the intake opening (8) facing the impeller (1) or at least one segment (7a) of the base plate is mounted so as to be movable against spring pressure (20) in such a way that the distance thereof from the impeller (1) and thus from the impeller vanes (3, 4) changes.

Abstract: The invention relates to a centrifugal pump, in particular a waste water submersible pump having an impeller (1), of which the end face facing the pump intake opening is open and only the end face of the impeller facing away from the intake opening (8) is covered by a circular coaxial impeller hub (2), on which the curved vanes (3, 4) are fastened, and in particular moulded on, wherein the base plate (7) having the intake opening (8) facing the impeller (1) or at least one segment (7a) of the base plate is mounted so as to be movable against spring pressure (20) in such a way that the distance thereof from the impeller (1) and thus from the impeller vanes (3, 4) changes.

Abstract: Described is a drive motor, in particular for a pump, which has a rotor having a drive shaft, and a stator enclosed by a stator casing which is enclosed by an outer casing. The stator casing and the outer casing form an intermediate space which is hermetically sealingly closed off and which is filled with a cooling fluid. The cooling fluid is positively moved by means of a coolant impeller. For that purpose the coolant impeller is coupled to the drive shaft of the electric drive motor by means of a permanent magnet coupling which is in the form of a synchronous coupling, a hysteresis coupling or an eddy current coupling.

Abstract: The invention concerns a method of treating filamentous and flocculating microorganism-bearing effluent, sludge or organic substrates used in biogas installations, for reducing or avoiding the formation of bulking sludge, floating sludge and/or foam, wherein the effluent, sludge or organic substrates is or are guided in a flow passage and in the flow passage subjected to a shear loading which is sufficient to reduce the relative ratio of the number of filamentous microorganisms in relation to flocculating microorganisms. The invention further concerns an apparatus for carrying out the method.

Abstract: Described is a drive motor, in particular for a pump, which has a rotor having a drive shaft, and a stator enclosed by a stator casing which is enclosed by an outer casing. The stator casing and the outer casing form an intermediate space which is hermetically sealingly closed off and which is filled with a cooling fluid. The cooling fluid is positively moved by means of a coolant impeller. For that purpose the coolant impeller is coupled to the drive shaft of the electric drive motor by means of a permanent magnet coupling which is in the form of a synchronous coupling, a hysteresis coupling or an eddy current coupling.

Abstract: The invention concerns a method of treating filamentous and flocculating microorganism-bearing effluent, sludge or organic substrates used in biogas installations, for reducing or avoiding the formation of bulking sludge, floating sludge and/or foam, wherein the effluent, sludge or organic substrates is or are guided in a flow passage and in the flow passage subjected to a shear loading which is sufficient to reduce the relative ratio of the number of filamentous microorganisms in relation to flocculating microorganisms. The invention further concerns an apparatus for carrying out the method.