Abstract: Disclosed is a filter device (10), particularly a liquid filter, comprising a filter element (16) that is disposed in a filter housing (12, 14) and a heater (28) for heating medium flowing through the filter device (10). The inventive filter device (10) is characterized in that the heater (28) is designed with at least one heating circuit (30) that is molded into the filter housing (12, 14). Alternatively or additionally, the heater (28) is designed with at least one heating circuit (30) which is provided with an electrical contact (34) in at least one of the final zones thereof, said electrical contact (34) being riveted to the heating circuit (28).

Abstract: A metering valve assembly having a metering valve for metering an aqueous urea solution for posttreatment of exhaust gases from internal combustion engines, the liquid being capable of being fed in a feeding direction to the metering valve and a mixing chamber being provided, in which the liquid is miscible with a gas in a gas flow. The metering valve is evacuatable contrary to the feeding direction.

Abstract: Disclosed is a filter device (10), particularly a liquid filter, comprising a filter element (16) that is disposed in a filter housing (12, 14) and a heater (28) for heating medium flowing through the filter device (10). The inventive filter device (10) is characterized in that the heater (28) is designed with at least one heating circuit (30) that is molded into the filter housing (12, 14). Alternatively or additionally, the heater (28) is designed with at least one heating circuit (30) which is provided with an electrical contact (34) in at least one of the final zones thereof, said electrical contact (34) being riveted to the heating circuit (28).

Abstract: A metering valve assembly having a metering valve for metering an aqueous urea solution for posttreatment of exhaust gases from internal combustion engines, the liquid being capable of being fed in a feeding direction to the metering valve and a mixing chamber being provided, in which the liquid is miscible with a gas in a gas flow. The metering valve is evacuatable contrary to the feeding direction.

Abstract: An apparatus for posttreatment of exhaust gases of an internal combustion engine, using a reducing agent to be introduced into the exhaust gases, in particular a urea or a urea-and-water solution, having an improved mixing chamber into which stored reducing agent, via a reducing agent line, and compressed air via a compressed air line can be introduced to create a reducing agent-air mixture, and means for preventing a reverse flow of reducing agent or reducing agent-air mixture from the mixing chamber into the compressed air line are provided which have a spring-loaded sealing hose. This arrangement assures secure sealing off of an attachable compressed air system from the corrosive reducing agent.

Abstract: An apparatus for posttreatment of exhaust gases of an internal combustion engine, using a reducing agent to be introduced into the exhaust gases, in particular a urea or a urea-and-water solution, having a mixing chamber, and a mixing chamber itself, are proposed, into which mixing chamber stored reducing agent, via a reducing agent line, and compressed air via a compressed air line can be introduced to create a reducing agent-air mixture, and means for preventing a reverse flow of reducing agent or reducing agent-air mixture from the mixing chamber into the compressed air line are provided which have a spring-loaded (112, 114) sealing hose (110). This arrangement assures secure sealing off of an attachable compressed air system from the corrosive reducing agent.